fixed empty units/foods (again)

cookbook/migrations/0116_auto_20210319_0012.py

@@ -0,0 +1,40 @@
+# Generated by Django 3.1.7 on 2021-03-18 23:12
+
+from django.db import migrations
+from django_scopes import scopes_disabled
+
+
+def remove_empty_food_unit(apps, schema_editor):
+    with scopes_disabled():
+        Ingredient = apps.get_model('cookbook', 'Ingredient')
+        ShoppingListEntry = apps.get_model('cookbook', 'ShoppingListEntry')
+
+        Food = apps.get_model('cookbook', 'Food')
+        Unit = apps.get_model('cookbook', 'Unit')
+
+        for f in Food.objects.filter(name='').all():
+            for o in Ingredient.objects.filter(food=f):
+                o.food = None
+                o.save()
+
+            for o in ShoppingListEntry.objects.filter(food=f):
+                o.delete()
+
+        for u in Unit.objects.filter(name='').all():
+            for o in Ingredient.objects.filter(unit=u):
+                o.unit = None
+                o.save()
+
+            for o in ShoppingListEntry.objects.filter(unit=u):
+                o.unit = None
+                o.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('cookbook', '0115_telegrambot'),
+    ]
+
+    operations = [
+        migrations.RunPython(remove_empty_food_unit),
+    ]