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from django.db import migrations, models
def backfill_state(apps, schema_editor):
"""Items at quantity 0 are 'out'; everything else is 'in' (the field default)."""
PantryItem = apps.get_model("kitchen", "PantryItem")
PantryItem.objects.filter(quantity=0).update(state="out")
class Migration(migrations.Migration):
dependencies = [
("kitchen", "0002_add_rating_and_preferences"),
]
operations = [
migrations.AddField(
model_name="pantryitem",
name="state",
field=models.CharField(
choices=[("in", "In stock"), ("low", "Running low"), ("out", "Out")],
default="in",
max_length=10,
),
),
# Runs while quantity is still a Decimal column — 0 matches fine.
migrations.RunPython(backfill_state, migrations.RunPython.noop),
migrations.AlterField(
model_name="pantryitem",
name="quantity",
field=models.PositiveIntegerField(
blank=True,
help_text="Optional rough count; In/Low/Out is the primary signal",
null=True,
),
),
migrations.AlterField(
model_name="pantryitem",
name="unit",
field=models.CharField(blank=True, max_length=20),
),
]
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