Add metadata to plugin configs (#5019)

* add metadata to plugin

* Api version bump

* exclude metadata from admin to fix test

InvenTree/InvenTree/api_version.py

@@ -2,11 +2,14 @@
 
 
 # InvenTree API version
-INVENTREE_API_VERSION = 122
+INVENTREE_API_VERSION = 123
 
 """
 Increment this API version number whenever there is a significant change to the API that any clients need to know about
 
+v123 -> 2023-06-15 : https://github.com/inventree/InvenTree/pull/5019
+    - Add Metadata to: Plugin Config
+
 v122 -> 2023-06-14 : https://github.com/inventree/InvenTree/pull/5034
     - Adds new BuildLineLabel label type
 

InvenTree/plugin/admin.py

@@ -56,6 +56,7 @@ class PluginConfigAdmin(admin.ModelAdmin):
     list_filter = ['active']
     actions = [plugin_activate, plugin_deactivate, ]
     inlines = [PluginSettingInline, ]
+    exclude = ['metadata', ]
 
 
 class NotificationUserSettingAdmin(admin.ModelAdmin):

InvenTree/plugin/api.py

@@ -9,6 +9,7 @@ from rest_framework.response import Response
 
 import plugin.serializers as PluginSerializers
 from common.api import GlobalSettingsPermissions
+from InvenTree.api import MetadataView
 from InvenTree.filters import SEARCH_ORDER_FILTER
 from InvenTree.mixins import (CreateAPI, ListAPI, RetrieveUpdateAPI,
                               RetrieveUpdateDestroyAPI, UpdateAPI)
@@ -266,6 +267,9 @@ plugin_api_urls = [
             re_path(r'^.*$', PluginDetail.as_view(), name='api-plugin-detail'),
         ])),
 
+        # Metadata
+        re_path('^metadata/', MetadataView.as_view(), {'model': PluginConfig}, name='api-plugin-metadata'),
+
         # Plugin management
         re_path(r'^install/', PluginInstall.as_view(), name='api-plugin-install'),
         re_path(r'^activate/', PluginActivate.as_view(), name='api-plugin-activate'),

InvenTree/plugin/migrations/0006_pluginconfig_metadata.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.19 on 2023-06-11 16:04
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('plugin', '0005_notificationusersetting'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='pluginconfig',
+            name='metadata',
+            field=models.JSONField(blank=True, help_text='JSON metadata field, for use by external plugins', null=True, verbose_name='Plugin Metadata'),
+        ),
+    ]

InvenTree/plugin/models.py

@@ -10,10 +10,11 @@ from django.db import models
 from django.utils.translation import gettext_lazy as _
 
 import common.models
+import InvenTree.models
 from plugin import InvenTreePlugin, registry
 
 
-class PluginConfig(models.Model):
+class PluginConfig(InvenTree.models.MetadataMixin, models.Model):
     """A PluginConfig object holds settings for plugins.
 
     Attributes: