Add StockItemAttachment model

InvenTree/stock/admin.py

@@ -8,7 +8,7 @@ from import_export.resources import ModelResource
 from import_export.fields import Field
 import import_export.widgets as widgets
 
-from .models import StockLocation, StockItem
+from .models import StockLocation, StockItem, StockItemAttachment
 from .models import StockItemTracking
 
 from build.models import Build
@@ -108,6 +108,12 @@ class StockItemAdmin(ImportExportModelAdmin):
     list_display = ('part', 'quantity', 'location', 'status', 'updated')
 
 
+class StockAttachmentAdmin(admin.ModelAdmin):
+
+    list_display = ('stock_item', 'attachment', 'comment')
+    
+
+
 class StockTrackingAdmin(ImportExportModelAdmin):
     list_display = ('item', 'date', 'title')
 
@@ -115,3 +121,4 @@ class StockTrackingAdmin(ImportExportModelAdmin):
 admin.site.register(StockLocation, LocationAdmin)
 admin.site.register(StockItem, StockItemAdmin)
 admin.site.register(StockItemTracking, StockTrackingAdmin)
+admin.site.register(StockItemAttachment, StockAttachmentAdmin)

InvenTree/stock/migrations/0036_stockitemattachment.py

@@ -0,0 +1,27 @@
+# Generated by Django 3.0.5 on 2020-05-06 23:36
+
+import InvenTree.models
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0035_auto_20200502_2308'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='StockItemAttachment',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('attachment', models.FileField(help_text='Select file to attach', upload_to=InvenTree.models.rename_attachment)),
+                ('comment', models.CharField(help_text='File comment', max_length=100)),
+                ('stock_item', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='attachments', to='stock.StockItem')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

InvenTree/stock/models.py

@@ -27,7 +27,7 @@ from datetime import datetime
 from InvenTree import helpers
 
 from InvenTree.status_codes import StockStatus
-from InvenTree.models import InvenTreeTree
+from InvenTree.models import InvenTreeTree, InvenTreeAttachment
 from InvenTree.fields import InvenTreeURLField
 
 from part import models as PartModels
@@ -935,6 +935,21 @@ def before_delete_stock_item(sender, instance, using, **kwargs):
     StockItem.objects.rebuild()
 
 
+class StockItemAttachment(InvenTreeAttachment):
+    """
+    Model for storing file attachments against a StockItem object.
+    """
+
+    def getSubdir(self):
+        return os.path.join("stock_files", str(self.stock_item.id))
+
+    stock_item = models.ForeignKey(
+        StockItem,
+        on_delete=models.CASCADE,
+        related_name='attachments'
+    ) 
+
+
 class StockItemTracking(models.Model):
     """ Stock tracking entry - breacrumb for keeping track of automated stock transactions