Add a reference to a build for a stock item

InvenTree/stock/migrations/0010_stockitem_build.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.2.4 on 2019-09-01 13:08
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('build', '0005_auto_20190604_2217'),
+        ('stock', '0009_auto_20190715_2351'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='stockitem',
+            name='build',
+            field=models.ForeignKey(blank=True, help_text='Build for this stock item', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='build_outputs', to='build.Build'),
+        ),
+    ]

InvenTree/stock/models.py

@@ -101,6 +101,7 @@ class StockItem(models.Model):
         delete_on_deplete: If True, StockItem will be deleted when the stock level gets to zero
         status: Status of this StockItem (ref: InvenTree.status_codes.StockStatus)
         notes: Extra notes field
+        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
     """
@@ -300,6 +301,13 @@ class StockItem(models.Model):
 
     updated = models.DateField(auto_now=True, null=True)
 
+    build = models.ForeignKey(
+        'build.Build', on_delete=models.SET_NULL,
+        blank=True, null=True,
+        help_text='Build for this stock item',
+        related_name='build_outputs',
+    )
+
     purchase_order = models.ForeignKey(
         'order.PurchaseOrder',
         on_delete=models.SET_NULL,