Merge branch 'master' of https://github.com/inventree/InvenTree into not-working-tests

InvenTree/InvenTree/api.py

@@ -2,9 +2,6 @@
 Main JSON interface views
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.utils.translation import gettext_lazy as _
 from django.conf import settings
 from django.http import JsonResponse

InvenTree/InvenTree/api_tester.py

@@ -142,6 +142,18 @@ class InvenTreeAPITestCase(APITestCase):
 
         return response
 
+    def put(self, url, data, expected_code=None, format='json'):
+        """
+        Issue a PUT request
+        """
+
+        response = self.client.put(url, data=data, format=format)
+
+        if expected_code is not None:
+            self.assertEqual(response.status_code, expected_code)
+
+        return response
+
     def options(self, url, expected_code=None):
         """
         Issue an OPTIONS request

InvenTree/InvenTree/api_version.py

@@ -4,11 +4,16 @@ InvenTree API version information
 
 
 # InvenTree API version
-INVENTREE_API_VERSION = 48
+INVENTREE_API_VERSION = 49
 
 """
 Increment this API version number whenever there is a significant change to the API that any clients need to know about
 
+v49 -> 2022-05-09 : https://github.com/inventree/InvenTree/pull/2957
+    - Allows filtering of plugin list by 'active' status
+    - Allows filtering of plugin list by 'mixin' support
+    - Adds endpoint to "identify" or "locate" stock items and locations (using plugins)
+
 v48 -> 2022-05-12 : https://github.com/inventree/InvenTree/pull/2977
     - Adds "export to file" functionality for PurchaseOrder API endpoint
     - Adds "export to file" functionality for SalesOrder API endpoint

InvenTree/InvenTree/apps.py

@@ -131,7 +131,7 @@ class InvenTreeConfig(AppConfig):
                 update = True
 
             # Backend currency has changed?
-            if not base_currency == backend.base_currency:
+            if base_currency != backend.base_currency:
                 logger.info(f"Base currency changed from {backend.base_currency} to {base_currency}")
                 update = True
 

InvenTree/InvenTree/fields.py

@@ -1,7 +1,5 @@
 """ Custom fields used in InvenTree """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 import sys
 
 from .validators import allowable_url_schemes

InvenTree/InvenTree/forms.py

@@ -2,8 +2,6 @@
 Helper forms which subclass Django forms to provide additional functionality
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 from urllib.parse import urlencode
 import logging
 

InvenTree/InvenTree/helpers.py

@@ -224,7 +224,7 @@ def increment(n):
     groups = result.groups()
 
     # If we cannot match the regex, then simply return the provided value
-    if not len(groups) == 2:
+    if len(groups) != 2:
         return value
 
     prefix, number = groups
@@ -536,7 +536,7 @@ def extract_serial_numbers(serials, expected_quantity, next_number: int):
         raise ValidationError([_("No serial numbers found")])
 
     # The number of extracted serial numbers must match the expected quantity
-    if not expected_quantity == len(numbers):
+    if expected_quantity != len(numbers):
         raise ValidationError([_("Number of unique serial numbers ({s}) must match quantity ({q})").format(s=len(numbers), q=expected_quantity)])
 
     return numbers
@@ -575,7 +575,7 @@ def validateFilterString(value, model=None):
 
         pair = group.split('=')
 
-        if not len(pair) == 2:
+        if len(pair) != 2:
             raise ValidationError(
                 "Invalid group: {g}".format(g=group)
             )

InvenTree/InvenTree/metadata.py

@@ -250,7 +250,7 @@ class InvenTreeMetadata(SimpleMetadata):
         field_info = super().get_field_info(field)
 
         # If a default value is specified for the serializer field, add it!
-        if 'default' not in field_info and not field.default == empty:
+        if 'default' not in field_info and field.default != empty:
             field_info['default'] = field.get_default()
 
         # Force non-nullable fields to read as "required"

InvenTree/InvenTree/models.py

@@ -259,7 +259,7 @@ class InvenTreeAttachment(models.Model):
         new_file = os.path.abspath(new_file)
 
         # Check that there are no directory tricks going on...
-        if not os.path.dirname(new_file) == attachment_dir:
+        if os.path.dirname(new_file) != attachment_dir:
             logger.error(f"Attempted to rename attachment outside valid directory: '{new_file}'")
             raise ValidationError(_("Invalid attachment directory"))
 

InvenTree/InvenTree/serializers.py

@@ -2,9 +2,6 @@
 Serializers used in various InvenTree apps
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 import tablib
 

InvenTree/InvenTree/settings.py

@@ -658,7 +658,7 @@ AUTH_PASSWORD_VALIDATORS = [
 
 EXTRA_URL_SCHEMES = CONFIG.get('extra_url_schemes', [])
 
-if not type(EXTRA_URL_SCHEMES) in [list]:  # pragma: no cover
+if type(EXTRA_URL_SCHEMES) not in [list]:  # pragma: no cover
     logger.warning("extra_url_schemes not correctly formatted")
     EXTRA_URL_SCHEMES = []
 

InvenTree/InvenTree/tasks.py

@@ -126,8 +126,8 @@ def heartbeat():
 
     try:
         from django_q.models import Success
-        logger.info("Could not perform heartbeat task - App registry not ready")
     except AppRegistryNotReady:  # pragma: no cover
+        logger.info("Could not perform heartbeat task - App registry not ready")
         return
 
     threshold = timezone.now() - timedelta(minutes=30)
@@ -204,7 +204,7 @@ def check_for_updates():
 
     response = requests.get('https://api.github.com/repos/inventree/inventree/releases/latest')
 
-    if not response.status_code == 200:
+    if response.status_code != 200:
         raise ValueError(f'Unexpected status code from GitHub API: {response.status_code}')
 
     data = json.loads(response.text)
@@ -216,13 +216,13 @@ def check_for_updates():
 
     match = re.match(r"^.*(\d+)\.(\d+)\.(\d+).*$", tag)
 
-    if not len(match.groups()) == 3:
+    if len(match.groups()) != 3:
         logger.warning(f"Version '{tag}' did not match expected pattern")
         return
 
     latest_version = [int(x) for x in match.groups()]
 
-    if not len(latest_version) == 3:
+    if len(latest_version) != 3:
         raise ValueError(f"Version '{tag}' is not correct format")
 
     logger.info(f"Latest InvenTree version: '{tag}'")

InvenTree/InvenTree/views.py

@@ -5,8 +5,6 @@ In particular these views provide base functionality for rendering Django forms
 as JSON objects and passing them to modal forms (using jQuery / bootstrap).
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 import os
 import json
 
@@ -627,7 +625,7 @@ class SetPasswordView(AjaxUpdateView):
         if valid:
             # Passwords must match
 
-            if not p1 == p2:
+            if p1 != p2:
                 error = _('Password fields must match')
                 form.add_error('enter_password', error)
                 form.add_error('confirm_password', error)

InvenTree/build/api.py

@@ -2,9 +2,6 @@
 JSON API for the Build app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.urls import include, re_path
 
 from rest_framework import filters, generics

InvenTree/build/models.py

@@ -2,8 +2,6 @@
 Build database model definitions
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 import decimal
 
 import os
@@ -777,7 +775,7 @@ class Build(MPTTModel, ReferenceIndexingMixin):
         if not output.is_building:
             raise ValidationError(_("Build output is already completed"))
 
-        if not output.build == self:
+        if output.build != self:
             raise ValidationError(_("Build output does not match Build Order"))
 
         # Unallocate all build items against the output
@@ -1240,7 +1238,7 @@ class BuildItem(models.Model):
                 })
 
             # Quantity must be 1 for serialized stock
-            if self.stock_item.serialized and not self.quantity == 1:
+            if self.stock_item.serialized and self.quantity != 1:
                 raise ValidationError({
                     'quantity': _('Quantity must be 1 for serialized stock')
                 })

InvenTree/build/serializers.py

@@ -2,9 +2,6 @@
 JSON serializers for Build API
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db import transaction
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.utils.translation import gettext_lazy as _

InvenTree/build/views.py

@@ -2,9 +2,6 @@
 Django views for interacting with Build objects
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import DetailView, ListView
 

InvenTree/common/api.py

@@ -2,9 +2,6 @@
 Provides a JSON API for common components.
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import json
 
 from django.http.response import HttpResponse

InvenTree/common/files.py

@@ -199,7 +199,7 @@ class FileManager:
 
                 try:
                     # Excel import casts number-looking-items into floats, which is annoying
-                    if item == int(item) and not str(item) == str(int(item)):
+                    if item == int(item) and str(item) != str(int(item)):
                         data[idx] = int(item)
                 except ValueError:
                     pass

InvenTree/common/forms.py

@@ -2,9 +2,6 @@
 Django forms for interacting with common objects
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django import forms
 from django.utils.translation import gettext as _
 

InvenTree/common/models.py

@@ -3,9 +3,6 @@ Common database model definitions.
 These models are 'generic' and do not fit a particular business logic object.
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 import decimal
 import math
@@ -1802,10 +1799,8 @@ class WebhookEndpoint(models.Model):
     def process_webhook(self):
         if self.token:
             self.verify = VerificationMethod.TOKEN
-            # TODO make a object-setting
         if self.secret:
             self.verify = VerificationMethod.HMAC
-            # TODO make a object-setting
         return True
 
     def validate_token(self, payload, headers, request):

InvenTree/common/serializers.py

@@ -2,9 +2,6 @@
 JSON serializers for common components
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from InvenTree.serializers import InvenTreeModelSerializer
 from InvenTree.helpers import get_objectreference
 

InvenTree/common/settings.py

@@ -2,9 +2,6 @@
 User-configurable settings for the common app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from moneyed import CURRENCIES
 from django.conf import settings
 

InvenTree/common/test_views.py

@@ -1,6 +1,3 @@
 """
 Unit tests for the views associated with the 'common' app
 """
-
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals

InvenTree/common/tests.py

@@ -133,7 +133,7 @@ class SettingsTest(TestCase):
             if description is None:
                 raise ValueError(f'Missing GLOBAL_SETTING description for {key}')  # pragma: no cover
 
-            if not key == key.upper():
+            if key != key.upper():
                 raise ValueError(f"SETTINGS key '{key}' is not uppercase")  # pragma: no cover
 
     def test_defaults(self):

InvenTree/common/views.py

@@ -2,9 +2,6 @@
 Django views for interacting with common models
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 
 from django.utils.translation import gettext_lazy as _

InvenTree/company/api.py

@@ -2,9 +2,6 @@
 Provides a JSON API for the Company app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django_filters.rest_framework import DjangoFilterBackend
 from django_filters import rest_framework as rest_filters
 

InvenTree/company/forms.py

@@ -2,9 +2,6 @@
 Django Forms for interacting with Company app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from InvenTree.forms import HelperForm
 from InvenTree.fields import RoundingDecimalFormField
 

InvenTree/company/models.py

@@ -2,9 +2,6 @@
 Company database model definitions
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 
 from django.utils.translation import gettext_lazy as _
@@ -494,7 +491,7 @@ class SupplierPart(models.Model):
         # Ensure that the linked manufacturer_part points to the same part!
         if self.manufacturer_part and self.part:
 
-            if not self.manufacturer_part.part == self.part:
+            if self.manufacturer_part.part != self.part:
                 raise ValidationError({
                     'manufacturer_part': _("Linked manufacturer part must reference the same base part"),
                 })

InvenTree/company/test_views.py

@@ -1,8 +1,5 @@
 """ Unit tests for Company views (see views.py) """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.test import TestCase
 from django.urls import reverse
 from django.contrib.auth import get_user_model

InvenTree/company/views.py

@@ -2,10 +2,6 @@
 Django views for interacting with Company app
 """
 
-
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import DetailView, ListView
 
@@ -162,7 +158,7 @@ class CompanyImageDownloadFromURL(AjaxUpdateView):
         self.response = response
 
         # Check for valid response code
-        if not response.status_code == 200:
+        if response.status_code != 200:
             form.add_error('url', _('Invalid response: {code}').format(code=response.status_code))
             return
 

InvenTree/label/apps.py

@@ -105,7 +105,7 @@ class LabelConfig(AppConfig):
                 # File already exists - let's see if it is the "same",
                 # or if we need to overwrite it with a newer copy!
 
-                if not hashFile(dst_file) == hashFile(src_file):  # pragma: no cover
+                if hashFile(dst_file) != hashFile(src_file):  # pragma: no cover
                     logger.info(f"Hash differs for '{filename}'")
                     to_copy = True
 
@@ -199,7 +199,7 @@ class LabelConfig(AppConfig):
                 # File already exists - let's see if it is the "same",
                 # or if we need to overwrite it with a newer copy!
 
-                if not hashFile(dst_file) == hashFile(src_file):  # pragma: no cover
+                if hashFile(dst_file) != hashFile(src_file):  # pragma: no cover
                     logger.info(f"Hash differs for '{filename}'")
                     to_copy = True
 
@@ -291,7 +291,7 @@ class LabelConfig(AppConfig):
             if os.path.exists(dst_file):
                 # File already exists - let's see if it is the "same"
 
-                if not hashFile(dst_file) == hashFile(src_file):  # pragma: no cover
+                if hashFile(dst_file) != hashFile(src_file):  # pragma: no cover
                     logger.info(f"Hash differs for '{filename}'")
                     to_copy = True
 

InvenTree/label/models.py

@@ -2,9 +2,6 @@
 Label printing models
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import sys
 import os
 import logging

InvenTree/label/test_api.py

@@ -1,8 +1,5 @@
 # Tests for labels
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.urls import reverse
 
 from InvenTree.api_tester import InvenTreeAPITestCase

InvenTree/label/tests.py

@@ -1,8 +1,5 @@
 # Tests for labels
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 
 from django.conf import settings

InvenTree/order/api.py

@@ -2,9 +2,6 @@
 JSON API for the Order app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.urls import include, path, re_path
 from django.db.models import Q, F
 
@@ -27,6 +24,8 @@ import order.serializers as serializers
 from part.models import Part
 from users.models import Owner
 
+from plugin.serializers import MetadataSerializer
+
 
 class GeneralExtraLineList:
     """
@@ -347,6 +346,15 @@ class PurchaseOrderIssue(PurchaseOrderContextMixin, generics.CreateAPIView):
     serializer_class = serializers.PurchaseOrderIssueSerializer
 
 
+class PurchaseOrderMetadata(generics.RetrieveUpdateAPIView):
+    """API endpoint for viewing / updating PurchaseOrder metadata"""
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(models.PurchaseOrder, *args, **kwargs)
+
+    queryset = models.PurchaseOrder.objects.all()
+
+
 class PurchaseOrderReceive(PurchaseOrderContextMixin, generics.CreateAPIView):
     """
     API endpoint to receive stock items against a purchase order.
@@ -916,6 +924,15 @@ class SalesOrderComplete(SalesOrderContextMixin, generics.CreateAPIView):
     serializer_class = serializers.SalesOrderCompleteSerializer
 
 
+class SalesOrderMetadata(generics.RetrieveUpdateAPIView):
+    """API endpoint for viewing / updating SalesOrder metadata"""
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(models.SalesOrder, *args, **kwargs)
+
+    queryset = models.SalesOrder.objects.all()
+
+
 class SalesOrderAllocateSerials(SalesOrderContextMixin, generics.CreateAPIView):
     """
     API endpoint to allocation stock items against a SalesOrder,
@@ -1138,10 +1155,13 @@ order_api_urls = [
 
         # Individual purchase order detail URLs
         re_path(r'^(?P<pk>\d+)/', include([
-            re_path(r'^issue/', PurchaseOrderIssue.as_view(), name='api-po-issue'),
-            re_path(r'^receive/', PurchaseOrderReceive.as_view(), name='api-po-receive'),
             re_path(r'^cancel/', PurchaseOrderCancel.as_view(), name='api-po-cancel'),
             re_path(r'^complete/', PurchaseOrderComplete.as_view(), name='api-po-complete'),
+            re_path(r'^issue/', PurchaseOrderIssue.as_view(), name='api-po-issue'),
+            re_path(r'^metadata/', PurchaseOrderMetadata.as_view(), name='api-po-metadata'),
+            re_path(r'^receive/', PurchaseOrderReceive.as_view(), name='api-po-receive'),
+
+            # PurchaseOrder detail API endpoint
             re_path(r'.*$', PurchaseOrderDetail.as_view(), name='api-po-detail'),
         ])),
 
@@ -1178,10 +1198,13 @@ order_api_urls = [
 
         # Sales order detail view
         re_path(r'^(?P<pk>\d+)/', include([
-            re_path(r'^cancel/', SalesOrderCancel.as_view(), name='api-so-cancel'),
-            re_path(r'^complete/', SalesOrderComplete.as_view(), name='api-so-complete'),
             re_path(r'^allocate/', SalesOrderAllocate.as_view(), name='api-so-allocate'),
             re_path(r'^allocate-serials/', SalesOrderAllocateSerials.as_view(), name='api-so-allocate-serials'),
+            re_path(r'^cancel/', SalesOrderCancel.as_view(), name='api-so-cancel'),
+            re_path(r'^complete/', SalesOrderComplete.as_view(), name='api-so-complete'),
+            re_path(r'^metadata/', SalesOrderMetadata.as_view(), name='api-so-metadata'),
+
+            # SalesOrder detail endpoint
             re_path(r'^.*$', SalesOrderDetail.as_view(), name='api-so-detail'),
         ])),
 

InvenTree/order/forms.py

@@ -2,9 +2,6 @@
 Django Forms for interacting with Order objects
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django import forms
 from django.utils.translation import gettext_lazy as _
 

InvenTree/order/migrations/0067_auto_20220516_1120.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.13 on 2022-05-16 11:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('order', '0066_alter_purchaseorder_supplier'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchaseorder',
+            name='metadata',
+            field=models.JSONField(blank=True, help_text='JSON metadata field, for use by external plugins', null=True, verbose_name='Plugin Metadata'),
+        ),
+        migrations.AddField(
+            model_name='salesorder',
+            name='metadata',
+            field=models.JSONField(blank=True, help_text='JSON metadata field, for use by external plugins', null=True, verbose_name='Plugin Metadata'),
+        ),
+    ]

InvenTree/order/models.py

@@ -30,7 +30,9 @@ from users import models as UserModels
 from part import models as PartModels
 from stock import models as stock_models
 from company.models import Company, SupplierPart
+
 from plugin.events import trigger_event
+from plugin.models import MetadataMixin
 
 import InvenTree.helpers
 from InvenTree.fields import InvenTreeModelMoneyField, RoundingDecimalField
@@ -97,7 +99,7 @@ def get_next_so_number():
     return reference
 
 
-class Order(ReferenceIndexingMixin):
+class Order(MetadataMixin, ReferenceIndexingMixin):
     """ Abstract model for an order.
 
     Instances of this class:
@@ -306,7 +308,7 @@ class PurchaseOrder(Order):
         except ValueError:
             raise ValidationError({'quantity': _("Invalid quantity provided")})
 
-        if not supplier_part.supplier == self.supplier:
+        if supplier_part.supplier != self.supplier:
             raise ValidationError({'supplier': _("Part supplier must match PO supplier")})
 
         if group:
@@ -445,7 +447,7 @@ class PurchaseOrder(Order):
         if barcode is None:
             barcode = ''
 
-        if not self.status == PurchaseOrderStatus.PLACED:
+        if self.status != PurchaseOrderStatus.PLACED:
             raise ValidationError(
                 "Lines can only be received against an order marked as 'PLACED'"
             )
@@ -729,7 +731,7 @@ class SalesOrder(Order):
         Return True if this order can be cancelled
         """
 
-        if not self.status == SalesOrderStatus.PENDING:
+        if self.status != SalesOrderStatus.PENDING:
             return False
 
         return True
@@ -1295,7 +1297,7 @@ class SalesOrderAllocation(models.Model):
             raise ValidationError({'item': _('Stock item has not been assigned')})
 
         try:
-            if not self.line.part == self.item.part:
+            if self.line.part != self.item.part:
                 errors['item'] = _('Cannot allocate stock item to a line with a different part')
         except PartModels.Part.DoesNotExist:
             errors['line'] = _('Cannot allocate stock to a line without a part')
@@ -1310,7 +1312,7 @@ class SalesOrderAllocation(models.Model):
         if self.quantity <= 0:
             errors['quantity'] = _('Allocation quantity must be greater than zero')
 
-        if self.item.serial and not self.quantity == 1:
+        if self.item.serial and self.quantity != 1:
             errors['quantity'] = _('Quantity must be 1 for serialized stock item')
 
         if self.line.order != self.shipment.order:

InvenTree/order/serializers.py

@@ -2,9 +2,6 @@
 JSON serializers for the Order API
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from decimal import Decimal
 
 from django.utils.translation import gettext_lazy as _

InvenTree/order/test_api.py

@@ -306,6 +306,22 @@ class PurchaseOrderTest(OrderTest):
 
         self.assertEqual(po.status, PurchaseOrderStatus.PLACED)
 
+    def test_po_metadata(self):
+        url = reverse('api-po-metadata', kwargs={'pk': 1})
+
+        self.patch(
+            url,
+            {
+                'metadata': {
+                    'yam': 'yum',
+                }
+            },
+            expected_code=200
+        )
+
+        order = models.PurchaseOrder.objects.get(pk=1)
+        self.assertEqual(order.get_metadata('yam'), 'yum')
+
 
 class PurchaseOrderReceiveTest(OrderTest):
     """
@@ -875,6 +891,22 @@ class SalesOrderTest(OrderTest):
 
         self.assertEqual(so.status, SalesOrderStatus.CANCELLED)
 
+    def test_so_metadata(self):
+        url = reverse('api-so-metadata', kwargs={'pk': 1})
+
+        self.patch(
+            url,
+            {
+                'metadata': {
+                    'xyz': 'abc',
+                }
+            },
+            expected_code=200
+        )
+
+        order = models.SalesOrder.objects.get(pk=1)
+        self.assertEqual(order.get_metadata('xyz'), 'abc')
+
 
 class SalesOrderAllocateTest(OrderTest):
     """

InvenTree/order/test_views.py

@@ -1,8 +1,5 @@
 """ Unit tests for Order views (see views.py) """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.test import TestCase
 from django.urls import reverse
 from django.contrib.auth import get_user_model

InvenTree/order/views.py

@@ -2,9 +2,6 @@
 Django views for interacting with Order app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.db.utils import IntegrityError
 from django.http.response import JsonResponse
 from django.shortcuts import get_object_or_404

InvenTree/part/api.py

@@ -2,9 +2,6 @@
 Provides a JSON API for the Part app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import datetime
 
 from django.urls import include, path, re_path
@@ -44,6 +41,7 @@ from stock.models import StockItem, StockLocation
 from common.models import InvenTreeSetting
 from build.models import Build, BuildItem
 import order.models
+from plugin.serializers import MetadataSerializer
 
 from . import serializers as part_serializers
 
@@ -203,6 +201,15 @@ class CategoryDetail(generics.RetrieveUpdateDestroyAPIView):
         return response
 
 
+class CategoryMetadata(generics.RetrieveUpdateAPIView):
+    """API endpoint for viewing / updating PartCategory metadata"""
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(PartCategory, *args, **kwargs)
+
+    queryset = PartCategory.objects.all()
+
+
 class CategoryParameterList(generics.ListAPIView):
     """ API endpoint for accessing a list of PartCategoryParameterTemplate objects.
 
@@ -587,6 +594,17 @@ class PartScheduling(generics.RetrieveAPIView):
         return Response(schedule)
 
 
+class PartMetadata(generics.RetrieveUpdateAPIView):
+    """
+    API endpoint for viewing / updating Part metadata
+    """
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(Part, *args, **kwargs)
+
+    queryset = Part.objects.all()
+
+
 class PartSerialNumberDetail(generics.RetrieveAPIView):
     """
     API endpoint for returning extra serial number information about a particular part
@@ -1912,7 +1930,15 @@ part_api_urls = [
         re_path(r'^tree/', CategoryTree.as_view(), name='api-part-category-tree'),
         re_path(r'^parameters/', CategoryParameterList.as_view(), name='api-part-category-parameter-list'),
 
-        re_path(r'^(?P<pk>\d+)/?', CategoryDetail.as_view(), name='api-part-category-detail'),
+        # Category detail endpoints
+        re_path(r'^(?P<pk>\d+)/', include([
+
+            re_path(r'^metadata/', CategoryMetadata.as_view(), name='api-part-category-metadata'),
+
+            # PartCategory detail endpoint
+            re_path(r'^.*$', CategoryDetail.as_view(), name='api-part-category-detail'),
+        ])),
+
         path('', CategoryList.as_view(), name='api-part-category-list'),
     ])),
 
@@ -1973,6 +1999,9 @@ part_api_urls = [
         # Endpoint for validating a BOM for the specific Part
         re_path(r'^bom-validate/', PartValidateBOM.as_view(), name='api-part-bom-validate'),
 
+        # Part metadata
+        re_path(r'^metadata/', PartMetadata.as_view(), name='api-part-metadata'),
+
         # Part detail endpoint
         re_path(r'^.*$', PartDetail.as_view(), name='api-part-detail'),
     ])),

InvenTree/part/forms.py

@@ -2,9 +2,6 @@
 Django Forms for interacting with Part objects
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django import forms
 from django.utils.translation import gettext_lazy as _
 

InvenTree/part/migrations/0076_auto_20220516_0819.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.13 on 2022-05-16 08:19
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0075_auto_20211128_0151'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='part',
+            name='metadata',
+            field=models.JSONField(blank=True, help_text='JSON metadata field, for use by external plugins', null=True, verbose_name='Plugin Metadata'),
+        ),
+        migrations.AddField(
+            model_name='partcategory',
+            name='metadata',
+            field=models.JSONField(blank=True, help_text='JSON metadata field, for use by external plugins', null=True, verbose_name='Plugin Metadata'),
+        ),
+    ]

InvenTree/part/models.py

@@ -2,8 +2,6 @@
 Part database model definitions
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 import decimal
 
 import os
@@ -46,29 +44,29 @@ from common.models import InvenTreeSetting
 
 from InvenTree import helpers
 from InvenTree import validators
-from InvenTree.models import InvenTreeTree, InvenTreeAttachment, DataImportMixin
-from InvenTree.fields import InvenTreeURLField
-from InvenTree.helpers import decimal2string, normalize, decimal2money
 
 import InvenTree.ready
 import InvenTree.tasks
 
+from InvenTree.fields import InvenTreeURLField
+from InvenTree.helpers import decimal2string, normalize, decimal2money
+from InvenTree.models import InvenTreeTree, InvenTreeAttachment, DataImportMixin
 from InvenTree.status_codes import BuildStatus, PurchaseOrderStatus, SalesOrderStatus
 
+import common.models
 from build import models as BuildModels
 from order import models as OrderModels
 from company.models import SupplierPart
+import part.settings as part_settings
 from stock import models as StockModels
 
-import common.models
-
-import part.settings as part_settings
+from plugin.models import MetadataMixin
 
 
 logger = logging.getLogger("inventree")
 
 
-class PartCategory(InvenTreeTree):
+class PartCategory(MetadataMixin, InvenTreeTree):
     """ PartCategory provides hierarchical organization of Part objects.
 
     Attributes:
@@ -327,7 +325,7 @@ class PartManager(TreeManager):
 
 
 @cleanup.ignore
-class Part(MPTTModel):
+class Part(MetadataMixin, MPTTModel):
     """ The Part object represents an abstract part, the 'concept' of an actual entity.
 
     An actual physical instance of a Part is a StockItem which is treated separately.
@@ -444,7 +442,7 @@ class Part(MPTTModel):
             previous = Part.objects.get(pk=self.pk)
 
             # Image has been changed
-            if previous.image is not None and not self.image == previous.image:
+            if previous.image is not None and self.image != previous.image:
 
                 # Are there any (other) parts which reference the image?
                 n_refs = Part.objects.filter(image=previous.image).exclude(pk=self.pk).count()
@@ -2895,7 +2893,7 @@ class BomItem(models.Model, DataImportMixin):
 
                 # If the sub_part is 'trackable' then the 'quantity' field must be an integer
                 if self.sub_part.trackable:
-                    if not self.quantity == int(self.quantity):
+                    if self.quantity != int(self.quantity):
                         raise ValidationError({
                             "quantity": _("Quantity must be integer value for trackable parts")
                         })

InvenTree/part/settings.py

@@ -2,9 +2,6 @@
 User-configurable settings for the Part app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from common.models import InvenTreeSetting
 
 

InvenTree/part/templates/part/detail.html

@@ -589,32 +589,15 @@
             // Get a list of the selected BOM items
             var rows = $("#bom-table").bootstrapTable('getSelections');
 
-            // TODO - In the future, display (in the dialog) which items are going to be deleted
-
-            showQuestionDialog(
-                '{% trans "Delete selected BOM items?" %}',
-                '{% trans "All selected BOM items will be deleted" %}',
-                {
-                    accept: function() {
-
-                        // Keep track of each DELETE request
-                        var requests = [];
-
-                        rows.forEach(function(row) {
-                            requests.push(
-                                inventreeDelete(
-                                    `/api/bom/${row.pk}/`,
-                                )
-                            );
-                        });
-
-                        // Wait for *all* the requests to complete
-                        $.when.apply($, requests).done(function() {
-                            location.reload();
-                        });
+            if (rows.length == 0) {
+                rows = $('#bom-table').bootstrapTable('getData');
             }
+
+            deleteBomItems(rows, {
+                success: function() {
+                    $('#bom-table').bootstrapTable('refresh');
                 }
-            );
+            });
         });
 
         $('#bom-upload').click(function() {

InvenTree/part/test_api.py

@@ -21,6 +21,85 @@ import build.models
 import order.models
 
 
+class PartCategoryAPITest(InvenTreeAPITestCase):
+    """Unit tests for the PartCategory API"""
+
+    fixtures = [
+        'category',
+        'part',
+        'location',
+        'bom',
+        'company',
+        'test_templates',
+        'manufacturer_part',
+        'supplier_part',
+        'order',
+        'stock',
+    ]
+
+    roles = [
+        'part.change',
+        'part.add',
+        'part.delete',
+        'part_category.change',
+        'part_category.add',
+    ]
+
+    def test_category_list(self):
+
+        # List all part categories
+        url = reverse('api-part-category-list')
+
+        response = self.get(url, expected_code=200)
+
+        self.assertEqual(len(response.data), 8)
+
+        # Filter by parent, depth=1
+        response = self.get(
+            url,
+            {
+                'parent': 1,
+                'cascade': False,
+            },
+            expected_code=200
+        )
+
+        self.assertEqual(len(response.data), 3)
+
+        # Filter by parent, cascading
+        response = self.get(
+            url,
+            {
+                'parent': 1,
+                'cascade': True,
+            },
+            expected_code=200,
+        )
+
+        self.assertEqual(len(response.data), 5)
+
+    def test_category_metadata(self):
+        """Test metadata endpoint for the PartCategory"""
+
+        cat = PartCategory.objects.get(pk=1)
+
+        cat.metadata = {
+            'foo': 'bar',
+            'water': 'melon',
+            'abc': 'xyz',
+        }
+
+        cat.set_metadata('abc', 'ABC')
+
+        response = self.get(reverse('api-part-category-metadata', kwargs={'pk': 1}), expected_code=200)
+
+        metadata = response.data['metadata']
+
+        self.assertEqual(metadata['foo'], 'bar')
+        self.assertEqual(metadata['water'], 'melon')
+        self.assertEqual(metadata['abc'], 'ABC')
+
+
 class PartOptionsAPITest(InvenTreeAPITestCase):
     """
     Tests for the various OPTIONS endpoints in the /part/ API
@@ -1021,6 +1100,59 @@ class PartDetailTests(InvenTreeAPITestCase):
         self.assertEqual(data['in_stock'], 9000)
         self.assertEqual(data['unallocated_stock'], 9000)
 
+    def test_part_metadata(self):
+        """
+        Tests for the part metadata endpoint
+        """
+
+        url = reverse('api-part-metadata', kwargs={'pk': 1})
+
+        part = Part.objects.get(pk=1)
+
+        # Metadata is initially null
+        self.assertIsNone(part.metadata)
+
+        part.metadata = {'foo': 'bar'}
+        part.save()
+
+        response = self.get(url, expected_code=200)
+
+        self.assertEqual(response.data['metadata']['foo'], 'bar')
+
+        # Add more data via the API
+        # Using the 'patch' method causes the new data to be merged in
+        self.patch(
+            url,
+            {
+                'metadata': {
+                    'hello': 'world',
+                }
+            },
+            expected_code=200
+        )
+
+        part.refresh_from_db()
+
+        self.assertEqual(part.metadata['foo'], 'bar')
+        self.assertEqual(part.metadata['hello'], 'world')
+
+        # Now, issue a PUT request (existing data will be replacted)
+        self.put(
+            url,
+            {
+                'metadata': {
+                    'x': 'y'
+                },
+            },
+            expected_code=200
+        )
+
+        part.refresh_from_db()
+
+        self.assertFalse('foo' in part.metadata)
+        self.assertFalse('hello' in part.metadata)
+        self.assertEqual(part.metadata['x'], 'y')
+
 
 class PartAPIAggregationTest(InvenTreeAPITestCase):
     """

InvenTree/part/test_param.py

@@ -1,8 +1,5 @@
 # Tests for Part Parameters
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.test import TestCase, TransactionTestCase
 import django.core.exceptions as django_exceptions
 

InvenTree/part/test_part.py

@@ -199,7 +199,7 @@ class PartTest(TestCase):
         with self.assertRaises(ValidationError):
             part_2.validate_unique()
 
-    def test_metadata(self):
+    def test_attributes(self):
         self.assertEqual(self.r1.name, 'R_2K2_0805')
         self.assertEqual(self.r1.get_absolute_url(), '/part/3/')
 
@@ -245,6 +245,24 @@ class PartTest(TestCase):
         self.assertEqual(float(self.r1.get_internal_price(1)), 0.08)
         self.assertEqual(float(self.r1.get_internal_price(10)), 0.5)
 
+    def test_metadata(self):
+        """Unit tests for the Part metadata field"""
+
+        p = Part.objects.get(pk=1)
+        self.assertIsNone(p.metadata)
+
+        self.assertIsNone(p.get_metadata('test'))
+        self.assertEqual(p.get_metadata('test', backup_value=123), 123)
+
+        # Test update via the set_metadata() method
+        p.set_metadata('test', 3)
+        self.assertEqual(p.get_metadata('test'), 3)
+
+        for k in ['apple', 'banana', 'carrot', 'carrot', 'banana']:
+            p.set_metadata(k, k)
+
+        self.assertEqual(len(p.metadata.keys()), 4)
+
 
 class TestTemplateTest(TestCase):
 

InvenTree/part/views.py

@@ -2,9 +2,6 @@
 Django views for interacting with Part app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.core.files.base import ContentFile
 from django.core.exceptions import ValidationError
 from django.db import transaction
@@ -628,7 +625,7 @@ class PartImageDownloadFromURL(AjaxUpdateView):
         self.response = response
 
         # Check for valid response code
-        if not response.status_code == 200:
+        if response.status_code != 200:
             form.add_error('url', _('Invalid response: {code}').format(code=response.status_code))
             return
 

InvenTree/plugin/api.py

@@ -2,15 +2,10 @@
 JSON API for the plugin app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from django.conf import settings
 from django.urls import include, re_path
 
-from rest_framework import generics
-from rest_framework import status
-from rest_framework import permissions
+from rest_framework import filters, generics, permissions, status
 from rest_framework.exceptions import NotFound
 from rest_framework.response import Response
 
@@ -19,6 +14,7 @@ from django_filters.rest_framework import DjangoFilterBackend
 from common.api import GlobalSettingsPermissions
 from plugin.base.barcodes.api import barcode_api_urls
 from plugin.base.action.api import ActionPluginView
+from plugin.base.locate.api import LocatePluginView
 from plugin.models import PluginConfig, PluginSetting
 import plugin.serializers as PluginSerializers
 from plugin.registry import registry
@@ -38,6 +34,35 @@ class PluginList(generics.ListAPIView):
     serializer_class = PluginSerializers.PluginConfigSerializer
     queryset = PluginConfig.objects.all()
 
+    def filter_queryset(self, queryset):
+        queryset = super().filter_queryset(queryset)
+
+        params = self.request.query_params
+
+        # Filter plugins which support a given mixin
+        mixin = params.get('mixin', None)
+
+        if mixin:
+            matches = []
+
+            for result in queryset:
+                if mixin in result.mixins().keys():
+                    matches.append(result.pk)
+
+            queryset = queryset.filter(pk__in=matches)
+
+        return queryset
+
+    filter_backends = [
+        DjangoFilterBackend,
+        filters.SearchFilter,
+        filters.OrderingFilter,
+    ]
+
+    filter_fields = [
+        'active',
+    ]
+
     ordering_fields = [
         'key',
         'name',
@@ -163,6 +188,7 @@ class PluginSettingDetail(generics.RetrieveUpdateAPIView):
 plugin_api_urls = [
     re_path(r'^action/', ActionPluginView.as_view(), name='api-action-plugin'),
     re_path(r'^barcode/', include(barcode_api_urls)),
+    re_path(r'^locate/', LocatePluginView.as_view(), name='api-locate-plugin'),
 ]
 
 general_plugin_api_urls = [

InvenTree/plugin/base/action/api.py

@@ -31,12 +31,8 @@ class ActionPluginView(APIView):
         action_plugins = registry.with_mixin('action')
         for plugin in action_plugins:
             if plugin.action_name() == action:
-                # TODO @matmair use easier syntax once InvenTree 0.7.0 is released
-                plugin.init(request.user, data=data)
-
-                plugin.perform_action()
-
-                return Response(plugin.get_response())
+                plugin.perform_action(request.user, data=data)
+                return Response(plugin.get_response(request.user, data=data))
 
         # If we got to here, no matching action was found
         return Response({

InvenTree/plugin/base/action/mixins.py

@@ -15,10 +15,9 @@ class ActionMixin:
         """
         MIXIN_NAME = 'Actions'
 
-    def __init__(self, user=None, data=None):
+    def __init__(self):
         super().__init__()
         self.add_mixin('action', True, __class__)
-        self.init(user, data)
 
     def action_name(self):
         """
@@ -31,19 +30,12 @@ class ActionMixin:
             return self.ACTION_NAME
         return self.name
 
-    def init(self, user, data=None):
-        """
-        An action plugin takes a user reference, and an optional dataset (dict)
-        """
-        self.user = user
-        self.data = data
-
-    def perform_action(self):
+    def perform_action(self, user=None, data=None):
         """
         Override this method to perform the action!
         """
 
-    def get_result(self):
+    def get_result(self, user=None, data=None):
         """
         Result of the action?
         """
@@ -51,19 +43,19 @@ class ActionMixin:
         # Re-implement this for cutsom actions
         return False
 
-    def get_info(self):
+    def get_info(self, user=None, data=None):
         """
         Extra info? Can be a string / dict / etc
         """
         return None
 
-    def get_response(self):
+    def get_response(self, user=None, data=None):
         """
         Return a response. Default implementation is a simple response
         which can be overridden.
         """
         return {
             "action": self.action_name(),
-            "result": self.get_result(),
-            "info": self.get_info(),
+            "result": self.get_result(user, data),
+            "info": self.get_info(user, data),
         }

InvenTree/plugin/base/action/test_action.py

@@ -14,27 +14,27 @@ class ActionMixinTests(TestCase):
     def setUp(self):
         class SimplePlugin(ActionMixin, InvenTreePlugin):
             pass
-        self.plugin = SimplePlugin('user')
+        self.plugin = SimplePlugin()
 
         class TestActionPlugin(ActionMixin, InvenTreePlugin):
             """a action plugin"""
             ACTION_NAME = 'abc123'
 
-            def perform_action(self):
+            def perform_action(self, user=None, data=None):
                 return ActionMixinTests.ACTION_RETURN + 'action'
 
-            def get_result(self):
+            def get_result(self, user=None, data=None):
                 return ActionMixinTests.ACTION_RETURN + 'result'
 
-            def get_info(self):
+            def get_info(self, user=None, data=None):
                 return ActionMixinTests.ACTION_RETURN + 'info'
 
-        self.action_plugin = TestActionPlugin('user')
+        self.action_plugin = TestActionPlugin()
 
         class NameActionPlugin(ActionMixin, InvenTreePlugin):
             NAME = 'Aplugin'
 
-        self.action_name = NameActionPlugin('user')
+        self.action_name = NameActionPlugin()
 
     def test_action_name(self):
         """check the name definition possibilities"""

InvenTree/plugin/base/barcodes/api.py

@@ -63,7 +63,6 @@ class BarcodeScan(APIView):
         plugin = None
 
         for current_plugin in plugins:
-            # TODO @matmair make simpler after InvenTree 0.7.0 release
             current_plugin.init(barcode_data)
 
             if current_plugin.validate():
@@ -168,7 +167,6 @@ class BarcodeAssign(APIView):
         plugin = None
 
         for current_plugin in plugins:
-            # TODO @matmair make simpler after InvenTree 0.7.0 release
             current_plugin.init(barcode_data)
 
             if current_plugin.validate():

InvenTree/plugin/base/event/events.py

@@ -2,9 +2,6 @@
 Functions for triggering and responding to server side events
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import logging
 
 from django.conf import settings

InvenTree/plugin/base/locate/api.py

@@ -0,0 +1,82 @@
+"""API for location plugins"""
+
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from rest_framework import permissions
+from rest_framework.exceptions import ParseError, NotFound
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from InvenTree.tasks import offload_task
+
+from plugin import registry
+from stock.models import StockItem, StockLocation
+
+
+class LocatePluginView(APIView):
+    """
+    Endpoint for using a custom plugin to identify or 'locate' a stock item or location
+    """
+
+    permission_classes = [
+        permissions.IsAuthenticated,
+    ]
+
+    def post(self, request, *args, **kwargs):
+
+        # Which plugin to we wish to use?
+        plugin = request.data.get('plugin', None)
+
+        if not plugin:
+            raise ParseError("'plugin' field must be supplied")
+
+        # Check that the plugin exists, and supports the 'locate' mixin
+        plugins = registry.with_mixin('locate')
+
+        if plugin not in [p.slug for p in plugins]:
+            raise ParseError(f"Plugin '{plugin}' is not installed, or does not support the location mixin")
+
+        # StockItem to identify
+        item_pk = request.data.get('item', None)
+
+        # StockLocation to identify
+        location_pk = request.data.get('location', None)
+
+        if not item_pk and not location_pk:
+            raise ParseError("Must supply either 'item' or 'location' parameter")
+
+        data = {
+            "success": "Identification plugin activated",
+            "plugin": plugin,
+        }
+
+        # StockItem takes priority
+        if item_pk:
+            try:
+                StockItem.objects.get(pk=item_pk)
+
+                offload_task('plugin.registry.call_function', plugin, 'locate_stock_item', item_pk)
+
+                data['item'] = item_pk
+
+                return Response(data)
+
+            except StockItem.DoesNotExist:
+                raise NotFound("StockItem matching PK '{item}' not found")
+
+        elif location_pk:
+            try:
+                StockLocation.objects.get(pk=location_pk)
+
+                offload_task('plugin.registry.call_function', plugin, 'locate_stock_location', location_pk)
+
+                data['location'] = location_pk
+
+                return Response(data)
+
+            except StockLocation.DoesNotExist:
+                raise NotFound("StockLocation matching PK {'location'} not found")
+
+        else:
+            raise NotFound()

InvenTree/plugin/base/locate/mixins.py

@@ -0,0 +1,74 @@
+"""Plugin mixin for locating stock items and locations"""
+
+import logging
+
+from plugin.helpers import MixinImplementationError
+
+logger = logging.getLogger('inventree')
+
+
+class LocateMixin:
+    """
+    Mixin class which provides support for 'locating' inventory items,
+    for example identifying the location of a particular StockLocation.
+
+    Plugins could implement audible or visual cues to direct attention to the location,
+    with (for e.g.) LED strips or buzzers, or some other method.
+
+    The plugins may also be used to *deliver* a particular stock item to the user.
+
+    A class which implements this mixin may implement the following methods:
+
+    - locate_stock_item : Used to locate / identify a particular stock item
+    - locate_stock_location : Used to locate / identify a particular stock location
+
+    Refer to the default method implementations below for more information!
+
+    """
+
+    class MixinMeta:
+        MIXIN_NAME = "Locate"
+
+    def __init__(self):
+        super().__init__()
+        self.add_mixin('locate', True, __class__)
+
+    def locate_stock_item(self, item_pk):
+        """
+        Attempt to locate a particular StockItem
+
+        Arguments:
+            item_pk: The PK (primary key) of the StockItem to be located
+
+        The default implementation for locating a StockItem
+        attempts to locate the StockLocation where the item is located.
+
+        An attempt is only made if the StockItem is *in stock*
+
+        Note: A custom implemenation could always change this behaviour
+        """
+
+        logger.info(f"LocateMixin: Attempting to locate StockItem pk={item_pk}")
+
+        from stock.models import StockItem
+
+        try:
+            item = StockItem.objects.get(pk=item_pk)
+
+            if item.in_stock and item.location is not None:
+                self.locate_stock_location(item.location.pk)
+
+        except StockItem.DoesNotExist:
+            logger.warning("LocateMixin: StockItem pk={item_pk} not found")
+            pass
+
+    def locate_stock_location(self, location_pk):
+        """
+        Attempt to location a particular StockLocation
+
+        Arguments:
+            location_pk: The PK (primary key) of the StockLocation to be located
+
+        Note: The default implementation here does nothing!
+        """
+        raise MixinImplementationError

InvenTree/plugin/builtin/action/simpleactionplugin.py

@@ -13,14 +13,14 @@ class SimpleActionPlugin(ActionMixin, InvenTreePlugin):
     NAME = "SimpleActionPlugin"
     ACTION_NAME = "simple"
 
-    def perform_action(self):
+    def perform_action(self, user=None, data=None):
         print("Action plugin in action!")
 
-    def get_info(self):
+    def get_info(self, user, data=None):
         return {
-            "user": self.user.username,
+            "user": user.username,
             "hello": "world",
         }
 
-    def get_result(self):
+    def get_result(self, user=None, data=None):
         return True

InvenTree/plugin/builtin/action/test_simpleactionplugin.py

@@ -15,7 +15,7 @@ class SimpleActionPluginTests(TestCase):
         self.test_user = user.objects.create_user('testuser', 'test@testing.com', 'password')
 
         self.client.login(username='testuser', password='password')
-        self.plugin = SimpleActionPlugin(user=self.test_user)
+        self.plugin = SimpleActionPlugin()
 
     def test_name(self):
         """check plugn names """

InvenTree/plugin/events.py

@@ -2,8 +2,10 @@
 Import helper for events
 """
 
-from plugin.base.event.events import trigger_event
+from plugin.base.event.events import process_event, register_event, trigger_event
 
 __all__ = [
+    'process_event',
+    'register_event',
     'trigger_event',
 ]

InvenTree/plugin/mixins/__init__.py

@@ -10,6 +10,7 @@ from ..base.action.mixins import ActionMixin
 from ..base.barcodes.mixins import BarcodeMixin
 from ..base.event.mixins import EventMixin
 from ..base.label.mixins import LabelPrintingMixin
+from ..base.locate.mixins import LocateMixin
 
 __all__ = [
     'APICallMixin',
@@ -23,6 +24,7 @@ __all__ = [
     'PanelMixin',
     'ActionMixin',
     'BarcodeMixin',
+    'LocateMixin',
     'SingleNotificationMethod',
     'BulkNotificationMethod',
 ]

InvenTree/plugin/models.py

@@ -2,8 +2,6 @@
 Plugin model definitions
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
 import warnings
 
 from django.utils.translation import gettext_lazy as _
@@ -16,6 +14,65 @@ import common.models
 from plugin import InvenTreePlugin, registry
 
 
+class MetadataMixin(models.Model):
+    """
+    Model mixin class which adds a JSON metadata field to a model,
+    for use by any (and all) plugins.
+
+    The intent of this mixin is to provide a metadata field on a model instance,
+    for plugins to read / modify as required, to store any extra information.
+
+    The assumptions for models implementing this mixin are:
+
+    - The internal InvenTree business logic will make no use of this field
+    - Multiple plugins may read / write to this metadata field, and not assume they have sole rights
+    """
+
+    class Meta:
+        abstract = True
+
+    metadata = models.JSONField(
+        blank=True, null=True,
+        verbose_name=_('Plugin Metadata'),
+        help_text=_('JSON metadata field, for use by external plugins'),
+    )
+
+    def get_metadata(self, key: str, backup_value=None):
+        """
+        Finds metadata for this model instance, using the provided key for lookup
+
+        Args:
+            key: String key for requesting metadata. e.g. if a plugin is accessing the metadata, the plugin slug should be used
+
+        Returns:
+            Python dict object containing requested metadata. If no matching metadata is found, returns None
+        """
+
+        if self.metadata is None:
+            return backup_value
+
+        return self.metadata.get(key, backup_value)
+
+    def set_metadata(self, key: str, data, commit=True):
+        """
+        Save the provided metadata under the provided key.
+
+        Args:
+            key: String key for saving metadata
+            data: Data object to save - must be able to be rendered as a JSON string
+            overwrite: If true, existing metadata with the provided key will be overwritten. If false, a merge will be attempted
+        """
+
+        if self.metadata is None:
+            # Handle a null field value
+            self.metadata = {}
+
+        self.metadata[key] = data
+
+        if commit:
+            self.save()
+
+
 class PluginConfig(models.Model):
     """
     A PluginConfig object holds settings for plugins.

InvenTree/plugin/registry.py

@@ -133,7 +133,6 @@ class PluginsRegistry:
                 if retry_counter <= 0:  # pragma: no cover
                     if settings.PLUGIN_TESTING:
                         print('[PLUGIN] Max retries, breaking loading')
-                    # TODO error for server status
                     break
                 if settings.PLUGIN_TESTING:
                     print(f'[PLUGIN] Above error occured during testing - {retry_counter}/{settings.PLUGIN_RETRY} retries left')
@@ -301,7 +300,6 @@ class PluginsRegistry:
                         # Errors are bad so disable the plugin in the database
                         if not settings.PLUGIN_TESTING:  # pragma: no cover
                             plugin_db_setting.active = False
-                            # TODO save the error to the plugin
                             plugin_db_setting.save(no_reload=True)
 
                         # Add to inactive plugins so it shows up in the ui
@@ -310,8 +308,6 @@ class PluginsRegistry:
 
                 # Initialize package
                 # now we can be sure that an admin has activated the plugin
-                # TODO check more stuff -> as of Nov 2021 there are not many checks in place
-                # but we could enhance those to check signatures, run the plugin against a whitelist etc.
                 logger.info(f'Loading plugin {plug_name}')
 
                 try:

InvenTree/plugin/samples/locate/locate_sample.py

@@ -0,0 +1,38 @@
+"""
+Sample plugin for locating stock items / locations.
+
+Note: This plugin does not *actually* locate anything!
+"""
+
+import logging
+
+from plugin import InvenTreePlugin
+from plugin.mixins import LocateMixin
+
+
+logger = logging.getLogger('inventree')
+
+
+class SampleLocatePlugin(LocateMixin, InvenTreePlugin):
+    """
+    A very simple example of the 'locate' plugin.
+    This plugin class simply prints location information to the logger.
+    """
+
+    NAME = "SampleLocatePlugin"
+    SLUG = "samplelocate"
+    TITLE = "Sample plugin for locating items"
+
+    VERSION = "0.1"
+
+    def locate_stock_location(self, location_pk):
+
+        from stock.models import StockLocation
+
+        logger.info(f"SampleLocatePlugin attempting to locate location ID {location_pk}")
+
+        try:
+            location = StockLocation.objects.get(pk=location_pk)
+            logger.info(f"Location exists at '{location.pathstring}'")
+        except StockLocation.DoesNotExist:
+            logger.error(f"Location ID {location_pk} does not exist!")

InvenTree/plugin/serializers.py

@@ -2,9 +2,6 @@
 JSON serializers for plugin app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 import subprocess
 
@@ -19,6 +16,34 @@ from plugin.models import PluginConfig, PluginSetting, NotificationUserSetting
 from common.serializers import GenericReferencedSettingSerializer
 
 
+class MetadataSerializer(serializers.ModelSerializer):
+    """
+    Serializer class for model metadata API access.
+    """
+
+    metadata = serializers.JSONField(required=True)
+
+    def __init__(self, model_type, *args, **kwargs):
+
+        self.Meta.model = model_type
+        super().__init__(*args, **kwargs)
+
+    class Meta:
+        fields = [
+            'metadata',
+        ]
+
+    def update(self, instance, data):
+
+        if self.partial:
+            # Default behaviour is to "merge" new data in
+            metadata = instance.metadata.copy() if instance.metadata else {}
+            metadata.update(data['metadata'])
+            data['metadata'] = metadata
+
+        return super().update(instance, data)
+
+
 class PluginConfigSerializer(serializers.ModelSerializer):
     """
     Serializer for a PluginConfig:

InvenTree/plugin/templatetags/plugin_extras.py

@@ -45,6 +45,14 @@ def mixin_enabled(plugin, key, *args, **kwargs):
     return plugin.mixin_enabled(key)
 
 
+@register.simple_tag()
+def mixin_available(mixin, *args, **kwargs):
+    """
+    Returns True if there is at least one active plugin which supports the provided mixin
+    """
+    return len(registry.with_mixin(mixin)) > 0
+
+
 @register.simple_tag()
 def navigation_enabled(*args, **kwargs):
     """

InvenTree/plugin/test_plugin.py

@@ -87,7 +87,7 @@ class InvenTreePluginTests(TestCase):
             AUTHOR = 'AA BB'
             DESCRIPTION = 'A description'
             VERSION = '1.2.3a'
-            WEBSITE = 'http://aa.bb/cc'
+            WEBSITE = 'https://aa.bb/cc'
             LICENSE = 'MIT'
 
         self.plugin_name = NameInvenTreePlugin()
@@ -147,7 +147,7 @@ class InvenTreePluginTests(TestCase):
         # website
         self.assertEqual(self.plugin.website, None)
         self.assertEqual(self.plugin_simple.website, None)
-        self.assertEqual(self.plugin_name.website, 'http://aa.bb/cc')
+        self.assertEqual(self.plugin_name.website, 'https://aa.bb/cc')
 
         # license
         self.assertEqual(self.plugin.license, None)

InvenTree/report/models.py

@@ -2,9 +2,6 @@
 Report template model definitions
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import os
 import sys
 import logging
@@ -389,7 +386,7 @@ class BuildReport(ReportTemplateBase):
 
         my_build = self.object_to_print
 
-        if not type(my_build) == build.models.Build:
+        if type(my_build) != build.models.Build:
             raise TypeError('Provided model is not a Build object')
 
         return {

InvenTree/stock/api.py

@@ -2,9 +2,6 @@
 JSON API for the Stock app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from collections import OrderedDict
 from datetime import datetime, timedelta
 
@@ -43,6 +40,8 @@ from order.serializers import PurchaseOrderSerializer
 from part.models import BomItem, Part, PartCategory
 from part.serializers import PartBriefSerializer
 
+from plugin.serializers import MetadataSerializer
+
 from stock.admin import StockItemResource
 from stock.models import StockLocation, StockItem
 from stock.models import StockItemTracking
@@ -92,6 +91,15 @@ class StockDetail(generics.RetrieveUpdateDestroyAPIView):
         return self.serializer_class(*args, **kwargs)
 
 
+class StockMetadata(generics.RetrieveUpdateAPIView):
+    """API endpoint for viewing / updating StockItem metadata"""
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(StockItem, *args, **kwargs)
+
+    queryset = StockItem.objects.all()
+
+
 class StockItemContextMixin:
     """ Mixin class for adding StockItem object to serializer context """
 
@@ -1368,6 +1376,15 @@ class StockTrackingList(generics.ListAPIView):
     ]
 
 
+class LocationMetadata(generics.RetrieveUpdateAPIView):
+    """API endpoint for viewing / updating StockLocation metadata"""
+
+    def get_serializer(self, *args, **kwargs):
+        return MetadataSerializer(StockLocation, *args, **kwargs)
+
+    queryset = StockLocation.objects.all()
+
+
 class LocationDetail(generics.RetrieveUpdateDestroyAPIView):
     """ API endpoint for detail view of StockLocation object
 
@@ -1385,7 +1402,14 @@ stock_api_urls = [
 
         re_path(r'^tree/', StockLocationTree.as_view(), name='api-location-tree'),
 
-        re_path(r'^(?P<pk>\d+)/', LocationDetail.as_view(), name='api-location-detail'),
+        # Stock location detail endpoints
+        re_path(r'^(?P<pk>\d+)/', include([
+
+            re_path(r'^metadata/', LocationMetadata.as_view(), name='api-location-metadata'),
+
+            re_path(r'^.*$', LocationDetail.as_view(), name='api-location-detail'),
+        ])),
+
         re_path(r'^.*$', StockLocationList.as_view(), name='api-location-list'),
     ])),
 
@@ -1417,8 +1441,9 @@ stock_api_urls = [
 
     # Detail views for a single stock item
     re_path(r'^(?P<pk>\d+)/', include([
-        re_path(r'^serialize/', StockItemSerialize.as_view(), name='api-stock-item-serialize'),
         re_path(r'^install/', StockItemInstall.as_view(), name='api-stock-item-install'),
+        re_path(r'^metadata/', StockMetadata.as_view(), name='api-stock-item-metadata'),
+        re_path(r'^serialize/', StockItemSerialize.as_view(), name='api-stock-item-serialize'),
         re_path(r'^uninstall/', StockItemUninstall.as_view(), name='api-stock-item-uninstall'),
         re_path(r'^.*$', StockDetail.as_view(), name='api-stock-detail'),
     ])),

InvenTree/stock/forms.py

@@ -2,9 +2,6 @@
 Django Forms for interacting with Stock app
 """
 
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 from InvenTree.forms import HelperForm
 
 from .models import StockItem, StockItemTracking