Merge remote-tracking branch 'inventree/master'

InvenTree/InvenTree/middleware.py

@@ -1,5 +1,11 @@
 from django.shortcuts import HttpResponseRedirect
 from django.urls import reverse_lazy
+from django.db import connection
+import logging
+import time
+import operator
+
+logger = logging.getLogger(__name__)
 
 
 class AuthRequiredMiddleware(object):
@@ -24,3 +30,60 @@ class AuthRequiredMiddleware(object):
         # the view is called.
 
         return response
+
+
+class QueryCountMiddleware(object):
+    """
+    This middleware will log the number of queries run
+    and the total time taken for each request (with a
+    status code of 200). It does not currently support
+    multi-db setups.
+
+    Reference: https://www.dabapps.com/blog/logging-sql-queries-django-13/
+    """
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+
+        t_start = time.time()
+        response = self.get_response(request)
+        t_stop = time.time()
+
+        if response.status_code == 200:
+            total_time = 0
+
+            if len(connection.queries) > 0:
+
+                queries = {}
+
+                for query in connection.queries:
+                    query_time = query.get('time')
+
+                    sql = query.get('sql').split('.')[0]
+
+                    if sql in queries:
+                        queries[sql] += 1
+                    else:
+                        queries[sql] = 1
+
+                    if query_time is None:
+                        # django-debug-toolbar monkeypatches the connection
+                        # cursor wrapper and adds extra information in each
+                        # item in connection.queries. The query time is stored
+                        # under the key "duration" rather than "time" and is
+                        # in milliseconds, not seconds.
+                        query_time = float(query.get('duration', 0))
+
+                    total_time += float(query_time)
+
+                logger.debug('{n} queries run, {a:.3f}s / {b:.3f}s'.format(
+                    n=len(connection.queries),
+                    a=total_time,
+                    b=(t_stop - t_start)))
+
+                for x in sorted(queries.items(), key=operator.itemgetter(1), reverse=True):
+                    print(x[0], ':', x[1])
+
+        return response

InvenTree/InvenTree/settings.py

@@ -74,6 +74,26 @@ INSTALLED_APPS = [
     'qr_code',              # Generate QR codes
 ]
 
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'handlers': {
+        'console': {
+            'level': 'DEBUG',
+            'class': 'logging.StreamHandler',
+        },
+    },
+
+    # 'loggers': {
+    #    'ddjango.db.backends': {
+    #        'level': 'DEBUG',
+    #        'handlers': ['console',],
+    #        'propagate': True
+    #   },
+    # },
+}
+
+
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
@@ -83,9 +103,13 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-    'InvenTree.middleware.AuthRequiredMiddleware'
+    'InvenTree.middleware.AuthRequiredMiddleware',
+    'InvenTree.middleware.QueryCountMiddleware',
 ]
 
+if DEBUG:
+    MIDDLEWARE.append('InvenTree.middleware.QueryCountMiddleware')
+
 ROOT_URLCONF = 'InvenTree.urls'
 
 TEMPLATES = [

InvenTree/build/migrations/0001_initial.py

@@ -1,6 +1,5 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
-from django.conf import settings
 import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
@@ -11,9 +10,6 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('part', '0002_auto_20190519_0004'),
-        ('stock', '0001_initial'),
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
     ]
 
     operations = [
@@ -29,9 +25,6 @@ class Migration(migrations.Migration):
                 ('completion_date', models.DateField(blank=True, null=True)),
                 ('URL', models.URLField(blank=True, help_text='Link to external URL')),
                 ('notes', models.TextField(blank=True, help_text='Extra build notes')),
-                ('completed_by', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='builds_completed', to=settings.AUTH_USER_MODEL)),
-                ('part', models.ForeignKey(help_text='Select part to build', limit_choices_to={'active': True, 'buildable': True}, on_delete=django.db.models.deletion.CASCADE, related_name='builds', to='part.Part')),
-                ('take_from', models.ForeignKey(blank=True, help_text='Select location to take stock from for this build (leave blank to take from any stock location)', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='sourcing_builds', to='stock.StockLocation')),
             ],
         ),
         migrations.CreateModel(
@@ -40,10 +33,6 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                 ('quantity', models.PositiveIntegerField(default=1, help_text='Stock quantity to allocate to build', validators=[django.core.validators.MinValueValidator(1)])),
                 ('build', models.ForeignKey(help_text='Build to allocate parts', on_delete=django.db.models.deletion.CASCADE, related_name='allocated_stock', to='build.Build')),
-                ('stock_item', models.ForeignKey(help_text='Stock Item to allocate to build', on_delete=django.db.models.deletion.CASCADE, related_name='allocations', to='stock.StockItem')),
             ],
-            options={
-                'unique_together': {('build', 'stock_item')},
-            },
         ),
     ]

InvenTree/build/migrations/0002_auto_20190520_2204.py

@@ -0,0 +1,44 @@
+# Generated by Django 2.2 on 2019-05-20 12:04
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('part', '0001_initial'),
+        ('build', '0001_initial'),
+        ('stock', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='builditem',
+            name='stock_item',
+            field=models.ForeignKey(help_text='Stock Item to allocate to build', on_delete=django.db.models.deletion.CASCADE, related_name='allocations', to='stock.StockItem'),
+        ),
+        migrations.AddField(
+            model_name='build',
+            name='completed_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='builds_completed', to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.AddField(
+            model_name='build',
+            name='part',
+            field=models.ForeignKey(help_text='Select part to build', limit_choices_to={'active': True, 'buildable': True}, on_delete=django.db.models.deletion.CASCADE, related_name='builds', to='part.Part'),
+        ),
+        migrations.AddField(
+            model_name='build',
+            name='take_from',
+            field=models.ForeignKey(blank=True, help_text='Select location to take stock from for this build (leave blank to take from any stock location)', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='sourcing_builds', to='stock.StockLocation'),
+        ),
+        migrations.AlterUniqueTogether(
+            name='builditem',
+            unique_together={('build', 'stock_item')},
+        ),
+    ]

InvenTree/build/models.py

@@ -139,7 +139,7 @@ class Build(models.Model):
 
         allocations = []
 
-        for item in self.part.bom_items.all():
+        for item in self.part.bom_items.all().prefetch_related('sub_part'):
 
             # How many parts required for this build?
             q_required = item.quantity * self.quantity
@@ -216,7 +216,7 @@ class Build(models.Model):
         - Delete pending BuildItem objects
         """
 
-        for item in self.allocated_stock.all():
+        for item in self.allocated_stock.all().prefetch_related('stock_item'):
             
             # Subtract stock from the item
             item.stock_item.take_stock(
@@ -295,7 +295,7 @@ class Build(models.Model):
         """ Returns a dict of parts required to build this part (BOM) """
         parts = []
 
-        for item in self.part.bom_items.all():
+        for item in self.part.bom_items.all().prefetch_related('sub_part'):
             part = {'part': item.sub_part,
                     'per_build': item.quantity,
                     'quantity': item.quantity * self.quantity,

InvenTree/company/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
 import company.models
 import django.core.validators

InvenTree/company/migrations/0002_auto_20190520_2204.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
 from django.db import migrations, models
 import django.db.models.deletion
@@ -9,8 +9,8 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('company', '0001_initial'),
         ('part', '0001_initial'),
+        ('company', '0001_initial'),
     ]
 
     operations = [

InvenTree/company/models.py

@@ -250,7 +250,7 @@ class SupplierPart(models.Model):
         - If order multiples are to be observed, then we need to calculate based on that, too
         """
 
-        price_breaks = self.price_breaks.all()
+        price_breaks = self.price_breaks.filter(quantity__lte=quantity)
 
         # No price break information available?
         if len(price_breaks) == 0:

InvenTree/part/api.py

@@ -110,6 +110,9 @@ class PartList(generics.ListCreateAPIView):
             except PartCategory.DoesNotExist:
                 pass
 
+        # Ensure that related models are pre-loaded to reduce DB trips
+        parts_list = self.get_serializer_class().setup_eager_loading(parts_list)
+
         return parts_list
 
     permission_classes = [
@@ -201,9 +204,13 @@ class BomList(generics.ListCreateAPIView):
     - POST: Create a new BomItem object
     """
     
-    queryset = BomItem.objects.all()
     serializer_class = BomItemSerializer
 
+    def get_queryset(self):
+        queryset = BomItem.objects.all()
+        queryset = self.get_serializer_class().setup_eager_loading(queryset)
+        return queryset
+
     permission_classes = [
         permissions.IsAuthenticatedOrReadOnly,
     ]

InvenTree/part/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
 import InvenTree.validators
 from django.conf import settings

InvenTree/part/migrations/0002_auto_20190520_2204.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
 from django.conf import settings
 from django.db import migrations, models
@@ -10,10 +10,10 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('company', '0002_auto_20190519_0004'),
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-        ('stock', '0001_initial'),
         ('part', '0001_initial'),
+        ('company', '0002_auto_20190520_2204'),
+        ('stock', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
     ]
 
     operations = [

InvenTree/part/models.py

@@ -16,6 +16,7 @@ from django.conf import settings
 
 from django.core.files.base import ContentFile
 from django.db import models, transaction
+from django.db.models import Sum
 from django.core.validators import MinValueValidator
 
 from django.contrib.staticfiles.templatetags.staticfiles import static
@@ -410,7 +411,7 @@ class Part(models.Model):
         total = None
 
         # Calculate the minimum number of parts that can be built using each sub-part
-        for item in self.bom_items.all():
+        for item in self.bom_items.all().select_related('sub_part'):
             stock = item.sub_part.available_stock
             n = int(1.0 * stock / item.quantity)
 
@@ -448,7 +449,7 @@ class Part(models.Model):
 
         builds = []
 
-        for item in self.used_in.all():
+        for item in self.used_in.all().prefetch_related('part'):
 
             for build in item.part.active_builds:
                 b = {}
@@ -462,7 +463,7 @@ class Part(models.Model):
 
     @property
     def allocated_build_count(self):
-        """ Return the total number of this that are allocated for builds
+        """ Return the total number of this part that are allocated for builds
         """
 
         return sum([a['quantity'] for a in self.build_allocation])
@@ -481,7 +482,13 @@ class Part(models.Model):
 
     @property
     def stock_entries(self):
-        return [loc for loc in self.locations.all() if loc.in_stock]
+        """ Return all 'in stock' items. To be in stock:
+
+        - customer is None
+        - belongs_to is None
+        """
+
+        return self.stock_items.filter(customer=None, belongs_to=None)
 
     @property
     def total_stock(self):
@@ -489,7 +496,12 @@ class Part(models.Model):
         Part may be stored in multiple locations
         """
 
-        return sum([loc.quantity for loc in self.stock_entries])
+        total = self.stock_entries.aggregate(total=Sum('quantity'))['total']
+
+        if total:
+            return total
+        else:
+            return 0
 
     @property
     def has_bom(self):
@@ -518,9 +530,9 @@ class Part(models.Model):
         returns a string representation of a hash object which can be compared with a stored value
         """
 
-        hash = hashlib.md5('bom seed'.encode())
+        hash = hashlib.md5(str(self.id).encode())
 
-        for item in self.bom_items.all():
+        for item in self.bom_items.all().prefetch_related('sub_part'):
             hash.update(str(item.sub_part.id).encode())
             hash.update(str(item.sub_part.full_name).encode())
             hash.update(str(item.quantity).encode())
@@ -552,7 +564,7 @@ class Part(models.Model):
     def required_parts(self):
         """ Return a list of parts required to make this part (list of BOM items) """
         parts = []
-        for bom in self.bom_items.all():
+        for bom in self.bom_items.all().select_related('sub_part'):
             parts.append(bom.sub_part)
         return parts
 
@@ -561,43 +573,21 @@ class Part(models.Model):
         """ Return the number of supplier parts available for this part """
         return self.supplier_parts.count()
 
-    @property
-    def min_single_price(self):
-        return self.get_min_supplier_price(1)
-
-    @property
-    def max_single_price(self):
-        return self.get_max_supplier_price(1)
-
-    @property
-    def min_bom_price(self):
-        return self.get_min_bom_price(1)
-
-    @property
-    def max_bom_price(self):
-        return self.get_max_bom_price(1)
-
     @property
     def has_pricing_info(self):
         """ Return true if there is pricing information for this part """
-        return self.get_min_price() is not None
+        return self.get_price_range() is not None
 
     @property
     def has_complete_bom_pricing(self):
         """ Return true if there is pricing information for each item in the BOM. """
 
-        for item in self.bom_items.all():
+        for item in self.bom_items.all().select_related('sub_part'):
             if not item.sub_part.has_pricing_info:
                 return False
 
         return True
 
-    @property
-    def single_price_info(self):
-        """ Return a simplified pricing string for this part at single quantity """
-
-        return self.get_price_info()
-
     def get_price_info(self, quantity=1, buy=True, bom=True):
         """ Return a simplified pricing string for this part
         
@@ -607,71 +597,43 @@ class Part(models.Model):
             bom: Include BOM pricing (default = True)
         """
 
-        min_price = self.get_min_price(quantity, buy, bom)
-        max_price = self.get_max_price(quantity, buy, bom)
+        price_range = self.get_price_range(quantity, buy, bom)
 
-        if min_price is None:
+        if price_range is None:
             return None
 
+        min_price, max_price = price_range
+
         if min_price == max_price:
             return min_price
 
-        return "{a} to {b}".format(a=min_price, b=max_price)
+        return "{a} - {b}".format(a=min_price, b=max_price)
 
-    def get_min_supplier_price(self, quantity=1):
-        """ Return the minimum price of this part from all available suppliers.
-        
-        Args:
-            quantity: Number of units we wish to purchase (default = 1)
-
-        Returns:
-            Numerical price if pricing is available, else None
-         """
+    def get_supplier_price_range(self, quantity=1):
         
         min_price = None
-
-        for supplier_part in self.supplier_parts.all():
-            supplier_price = supplier_part.get_price(quantity)
-
-            if supplier_price is None:
-                continue
-
-            if min_price is None or supplier_price < min_price:
-                min_price = supplier_price
-
-        if min_price is None:
-            return None
-        else:
-            return min_price
-
-    def get_max_supplier_price(self, quantity=1):
-        """ Return the maximum price of this part from all available suppliers.
-        
-        Args:
-            quantity: Number of units we wish to purchase (default = 1)
-
-        Returns:
-            Numerical price if pricing is available, else None
-         """
-
         max_price = None
 
-        for supplier_part in self.supplier_parts.all():
-            supplier_price = supplier_part.get_price(quantity)
+        for supplier in self.supplier_parts.all():
 
-            if supplier_price is None:
+            price = supplier.get_price(quantity)
+
+            if price is None:
                 continue
 
-            if max_price is None or supplier_price > max_price:
-                max_price = supplier_price
+            if min_price is None or price < min_price:
+                min_price = price
 
-        if max_price is None:
+            if max_price is None or price > max_price:
+                max_price = price
+
+        if min_price is None or max_price is None:
             return None
-        else:
-            return max_price
 
-    def get_min_bom_price(self, quantity=1):
-        """ Return the minimum price of the BOM for this part.
+        return (min_price, max_price)
+
+    def get_bom_price_range(self, quantity=1):
+        """ Return the price range of the BOM for this part.
         Adds the minimum price for all components in the BOM.
 
         Note: If the BOM contains items without pricing information,
@@ -679,45 +641,33 @@ class Part(models.Model):
         """
 
         min_price = None
+        max_price = None
 
-        for item in self.bom_items.all():
-            price = item.sub_part.get_min_price(quantity * item.quantity)
+        for item in self.bom_items.all().select_related('sub_part'):
+            prices = item.sub_part.get_price_range(quantity * item.quantity)
 
-            if price is None:
+            if prices is None:
                 continue
 
+            low, high = prices
+
             if min_price is None:
                 min_price = 0
 
-            min_price += price
-
-        return min_price
-
-    def get_max_bom_price(self, quantity=1):
-        """ Return the maximum price of the BOM for this part.
-        Adds the maximum price for all components in the BOM.
-
-        Note: If the BOM contains items without pricing information,
-        these items cannot be included in the BOM!
-        """
-
-        max_price = None
-
-        for item in self.bom_items.all():
-            price = item.sub_part.get_max_price(quantity * item.quantity)
-
-            if price is None:
-                continue
-
             if max_price is None:
                 max_price = 0
 
-            max_price += price
+            min_price += low
+            max_price += high
 
-        return max_price
+        if min_price is None or max_price is None:
+            return None
 
-    def get_min_price(self, quantity=1, buy=True, bom=True):
-        """ Return the minimum price for this part. This price can be either:
+        return (min_price, max_price)
+
+    def get_price_range(self, quantity=1, buy=True, bom=True):
+        
+        """ Return the price range for this part. This price can be either:
 
         - Supplier price (if purchased from suppliers)
         - BOM price (if built from other parts)
@@ -726,37 +676,20 @@ class Part(models.Model):
             Minimum of the supplier price or BOM price. If no pricing available, returns None
         """
 
-        buy_price = self.get_min_supplier_price(quantity) if buy else None
-        bom_price = self.get_min_bom_price(quantity) if bom else None
+        buy_price_range = self.get_supplier_price_range(quantity) if buy else None
+        bom_price_range = self.get_bom_price_range(quantity) if bom else None
 
-        if buy_price is None:
-            return bom_price
+        if buy_price_range is None:
+            return bom_price_range
 
-        if bom_price is None:
-            return buy_price
+        elif bom_price_range is None:
+            return buy_price_range
 
-        return min(buy_price, bom_price)
-
-    def get_max_price(self, quantity=1, buy=True, bom=True):
-        """ Return the maximum price for this part. This price can be either:
-
-        - Supplier price (if purchsed from suppliers)
-        - BOM price (if built from other parts)
-
-        Returns:
-            Maximum of the supplier price or BOM price. If no pricing available, returns None
-        """
-
-        buy_price = self.get_max_supplier_price(quantity) if buy else None
-        bom_price = self.get_max_bom_price(quantity) if bom else None
-
-        if buy_price is None:
-            return bom_price
-
-        if bom_price is None:
-            return buy_price
-        
-        return max(buy_price, bom_price)
+        else:
+            return (
+                min(buy_price_range[0], bom_price_range[0]),
+                max(buy_price_range[1], bom_price_range[1])
+            )
 
     def deepCopy(self, other, **kwargs):
         """ Duplicates non-field data from another part.
@@ -995,8 +928,3 @@ class BomItem(models.Model):
         base_quantity = self.quantity * build_quantity
 
         return base_quantity + self.get_overage_quantity(base_quantity)
-
-    @property
-    def price_info(self):
-        """ Return the price for this item in the BOM """
-        return self.sub_part.get_price_info(self.quantity)

InvenTree/part/serializers.py

@@ -34,7 +34,14 @@ class PartBriefSerializer(serializers.ModelSerializer):
 
     url = serializers.CharField(source='get_absolute_url', read_only=True)
     image_url = serializers.CharField(source='get_image_url', read_only=True)
-    single_price_info = serializers.CharField(read_only=True)
+
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('category')
+        queryset = queryset.prefetch_related('stock_items')
+        queryset = queryset.prefetch_related('bom_items')
+        queryset = queryset.prefetch_related('builds')
+        return queryset
     
     class Meta:
         model = Part
@@ -44,7 +51,6 @@ class PartBriefSerializer(serializers.ModelSerializer):
             'full_name',
             'description',
             'available_stock',
-            'single_price_info',
             'image_url',
         ]
 
@@ -58,6 +64,14 @@ class PartSerializer(serializers.ModelSerializer):
     image_url = serializers.CharField(source='get_image_url', read_only=True)
     category_name = serializers.CharField(source='category_path', read_only=True)
 
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('category')
+        queryset = queryset.prefetch_related('stock_items')
+        queryset = queryset.prefetch_related('bom_items')
+        queryset = queryset.prefetch_related('builds')
+        return queryset
+
     class Meta:
         model = Part
         partial = True
@@ -108,7 +122,16 @@ class BomItemSerializer(InvenTreeModelSerializer):
 
     part_detail = PartBriefSerializer(source='part', many=False, read_only=True)
     sub_part_detail = PartBriefSerializer(source='sub_part', many=False, read_only=True)
-    price_info = serializers.CharField(read_only=True)
+
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('part')
+        queryset = queryset.prefetch_related('part__category')
+        queryset = queryset.prefetch_related('part__stock_items')
+        queryset = queryset.prefetch_related('sub_part')
+        queryset = queryset.prefetch_related('sub_part__category')
+        queryset = queryset.prefetch_related('sub_part__stock_items')
+        return queryset
 
     class Meta:
         model = BomItem
@@ -119,7 +142,6 @@ class BomItemSerializer(InvenTreeModelSerializer):
             'sub_part',
             'sub_part_detail',
             'quantity',
-            'price_info',
             'overage',
             'note',
         ]

InvenTree/part/templates/part/bom.html

@@ -16,9 +16,6 @@
     The BOM for <i>{{ part.full_name }}</i> does not have complete pricing information
 </div>
 {% endif %}
-<div class='panel panel-default'>
-    Single BOM Price: {{ part.min_bom_price }} to {{ part.max_bom_price }}
-</div>
 {% if part.bom_checked_date %}
 {% if part.is_bom_valid %}
 <div class='alert alert-block alert-info'>

InvenTree/part/templates/part/part_app_base.html

@@ -34,6 +34,7 @@ InvenTree | Part List
 
 {% block js_ready %}
 {{ block.super }}
+
     loadTree("{% url 'api-part-tree' %}",
             "#part-tree",
             {

InvenTree/part/templates/part/part_base.html

@@ -85,25 +85,6 @@
             <td>{{ part.allocation_count }}</td>
         </tr>
         {% endif %}
-        {% if part.supplier_count > 0 %}
-        <tr>
-            <td>
-                Price
-            </td>
-            <td>
-                {% if part.min_single_price %}
-                {% if part.min_single_price == part.max_single_price %}
-                {{ part.min_single_price }}
-                {% else %}
-                {{ part.min_single_price }} to {{ part.max_single_price }}
-                {% endif %}
-                from {{ part.supplier_count }} suppliers.
-                {% else %}
-                <span class='warning-msg'><i>No pricing data avilable</i></span>
-                {% endif %}
-            </td>
-        </tr>
-        {% endif %}
     </table>
 </div>
 </div>

InvenTree/part/views.py

@@ -34,7 +34,7 @@ class PartIndex(ListView):
     context_object_name = 'parts'
 
     def get_queryset(self):
-        return Part.objects.all()  # filter(category=None)
+        return Part.objects.all().select_related('category')
 
     def get_context_data(self, **kwargs):
 
@@ -355,7 +355,7 @@ class PartDetail(DetailView):
     """
 
     context_object_name = 'part'
-    queryset = Part.objects.all()
+    queryset = Part.objects.all().select_related('category')
     template_name = 'part/detail.html'
 
     # Add in some extra context information based on query params
@@ -567,6 +567,14 @@ class PartPricing(AjaxView):
 
     def get_pricing(self, quantity=1):
 
+        try:
+            quantity = int(quantity)
+        except ValueError:
+            quantity = 1
+
+        if quantity < 1:
+            quantity = 1
+
         part = self.get_part()
         
         ctx = {
@@ -579,8 +587,10 @@ class PartPricing(AjaxView):
 
         # Supplier pricing information
         if part.supplier_count > 0:
-            min_buy_price = part.get_min_supplier_price(quantity)
-            max_buy_price = part.get_max_supplier_price(quantity)
+            buy_price = part.get_supplier_price_range(quantity)
+
+            if buy_price is not None:
+                min_buy_price, max_buy_price = buy_price
 
                 if min_buy_price:
                     ctx['min_total_buy_price'] = min_buy_price
@@ -593,8 +603,10 @@ class PartPricing(AjaxView):
         # BOM pricing information
         if part.bom_count > 0:
 
-            min_bom_price = part.get_min_bom_price(quantity)
-            max_bom_price = part.get_max_bom_price(quantity)
+            bom_price = part.get_bom_price_range(quantity)
+
+            if bom_price is not None:
+                min_bom_price, max_bom_price = bom_price
 
                 if min_bom_price:
                     ctx['min_total_bom_price'] = min_bom_price
@@ -629,7 +641,7 @@ class CategoryDetail(DetailView):
     """ Detail view for PartCategory """
     model = PartCategory
     context_object_name = 'category'
-    queryset = PartCategory.objects.all()
+    queryset = PartCategory.objects.all().prefetch_related('children')
     template_name = 'part/category.html'
 
 

InvenTree/static/script/inventree/bom.js

@@ -151,19 +151,6 @@ function loadBomTable(table, options) {
             }
         }
         );
-
-        cols.push({
-            field: 'price_info',
-            title: 'Price',
-            sortable: true,
-            formatter: function(value, row, index, field) {
-                if (value) {
-                    return value;
-                } else {
-                    return "<span class='warning-msg'><i>No pricing information</i></span>";
-                }
-            },
-        });
     }
     
     // Part notes

InvenTree/stock/api.py

@@ -282,6 +282,9 @@ class StockList(generics.ListCreateAPIView):
         if supplier_id:
             stock_list = stock_list.filter(supplier_part__supplier=supplier_id)
 
+        # Pre-fetch related objects for better response time
+        stock_list = self.get_serializer_class().setup_eager_loading(stock_list)
+
         return stock_list
 
     serializer_class = StockItemSerializer

InvenTree/stock/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 2.2 on 2019-05-18 14:04
+# Generated by Django 2.2 on 2019-05-20 12:04
 
 from django.conf import settings
 import django.core.validators
@@ -11,9 +11,9 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-        ('company', '0001_initial'),
         ('part', '0001_initial'),
+        ('company', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
     ]
 
     operations = [
@@ -70,7 +70,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='stockitem',
             name='part',
-            field=models.ForeignKey(help_text='Base part', on_delete=django.db.models.deletion.CASCADE, related_name='locations', to='part.Part'),
+            field=models.ForeignKey(help_text='Base part', on_delete=django.db.models.deletion.CASCADE, related_name='stock_items', to='part.Part'),
         ),
         migrations.AddField(
             model_name='stockitem',

InvenTree/stock/models.py

@@ -186,7 +186,7 @@ class StockItem(models.Model):
             }
         )
 
-    part = models.ForeignKey('part.Part', on_delete=models.CASCADE, related_name='locations', help_text='Base part')
+    part = models.ForeignKey('part.Part', on_delete=models.CASCADE, related_name='stock_items', help_text='Base part')
 
     supplier_part = models.ForeignKey('company.SupplierPart', blank=True, null=True, on_delete=models.SET_NULL,
                                       help_text='Select a matching supplier part for this stock item')

InvenTree/stock/serializers.py

@@ -60,6 +60,15 @@ class StockItemSerializer(serializers.ModelSerializer):
     location = LocationBriefSerializer(many=False, read_only=True)
     status_text = serializers.CharField(source='get_status_display', read_only=True)
 
+    @staticmethod
+    def setup_eager_loading(queryset):
+        queryset = queryset.prefetch_related('part')
+        queryset = queryset.prefetch_related('part__stock_items')
+        queryset = queryset.prefetch_related('part__category')
+        queryset = queryset.prefetch_related('location')
+
+        return queryset
+
     class Meta:
         model = StockItem
         fields = [