#31167: Unable to delete or modify a constraint using model Meta
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Reporter: BITSOLVER | Owner: nobody
Type: Uncategorized | Status: new
Component: Migrations | Version: 2.2
Severity: Normal | Resolution:
Keywords: Migrations, unique | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by BITSOLVER):
On further investigation a previous migration had:
{{{
# Generated by Django 2.2.5 on 2019-09-30 13:40
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = [
('venue', '0008_standardcommunitycentreprice_venues'),
]
operations = [
migrations.RemoveConstraint(
model_name='standardcommunitycentrepricelist',
name='unique_standard_community_price_list',
),
migrations.AddConstraint(
model_name='standardcommunitycentrepricelist',
constraint=models.UniqueConstraint(fields=('customer_type',
'customer'), name='unique_standard_community_price_list'),
),
migrations.RemoveField(
model_name='standardcommunitycentrepricelist',
name='code',
),
migrations.AlterField(
model_name='standardcommunitycentreprice',
name='day_of_week',
field=models.IntegerField(choices=[(None, 'Any'), (1,
'Monday'), (2, 'Tuesday'), (3, 'Wednesday'), (4, 'Thursday'), (5,
'Friday'), (6, 'Saturday'), (7, 'Sunday')], null=True),
),
]
}}}
And if I delete remove constraint from the latest migration then run
migrate then the migrations completes.
If I then run makemigrations venue again it creates a remove constraint,
run again then it creates and add migration back.
Everything is back in sync now, I just wonder if something odd went on
with the order of operations for remove & add unique constraints?
--
Ticket URL: <https://code.djangoproject.com/ticket/31167#comment:1>
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