Create "SalesOrderAllocation" object

- Links multiple StockItem objects to a single SalesOrderLineItem

InvenTree/stock/__init__.py

@@ -6,4 +6,4 @@ It includes models for:
 - StockLocation
 - StockItem
 - StockItemTracking
-"""
+"""

InvenTree/stock/migrations/0031_auto_20200422_0209.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.0.5 on 2020-04-22 02:09
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('order', '0024_salesorderallocation'),
+        ('stock', '0030_auto_20200422_0015'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='stockitem',
+            name='sales_order_line',
+        ),
+        migrations.AddField(
+            model_name='stockitem',
+            name='sales_order',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='stock_items', to='order.SalesOrder'),
+        ),
+    ]

InvenTree/stock/models.py

@@ -29,7 +29,7 @@ from InvenTree.models import InvenTreeTree
 from InvenTree.fields import InvenTreeURLField
 
 from part.models import Part
-from order.models import PurchaseOrder, SalesOrderLineItem
+from order.models import PurchaseOrder, SalesOrder
 
 
 class StockLocation(InvenTreeTree):
@@ -127,7 +127,7 @@ class StockItem(MPTTModel):
         build: Link to a Build (if this stock item was created from a build)
         purchase_order: Link to a PurchaseOrder (if this stock item was created from a PurchaseOrder)
         infinite: If True this StockItem can never be exhausted
-        sales_order: Link to a SalesOrderLineItem (if this stockitem has been allocated to a sales order)
+        sales_order: Link to a SalesOrder object (if the StockItem has been assigned to a SalesOrder)
     """
 
     def save(self, *args, **kwargs):
@@ -263,20 +263,6 @@ class StockItem(MPTTModel):
             # TODO - Find a test than can be perfomed...
             pass
 
-        try:
-            # If this StockItem is assigned to a SalesOrderLineItem,
-            # the "Part" that the line item references is the same as the part that THIS references
-            if self.sales_order_line is not None:
-
-                if self.sales_order_line.part is None:
-                    raise ValidationError({'sales_order_line': _('Stock item cannot be assigned to a LineItem which does not reference a part')})
-                
-                if not self.sales_order_line.part == self.part:
-                    raise ValidationError({'sales_order_line': _('Stock item does not reference the same part object as the LineItem')})
-
-        except SalesOrderLineItem.DoesNotExist:
-            pass
-
         if self.belongs_to and self.belongs_to.pk == self.pk:
             raise ValidationError({
                 'belongs_to': _('Item cannot belong to itself')
@@ -369,8 +355,8 @@ class StockItem(MPTTModel):
         help_text=_('Purchase order for this stock item')
     )
 
-    sales_order_line = models.ForeignKey(
-        SalesOrderLineItem,
+    sales_order = models.ForeignKey(
+        SalesOrder,
         on_delete=models.SET_NULL,
         related_name='stock_items',
         null=True, blank=True)