Opened 5 years ago

Closed 5 years ago

#32276 closed Bug (duplicate)

Adding a unique UUIDField with default to an existing model results in IntegrityErrors.

Reported by: GaramNick Owned by: nobody
Component: Database layer (models, ORM) Version: 3.1
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Hi,

When adding a UUIDField to an existing model as per the following code I run into IntegrityErrors because of UUID collisions.

Django 3.1 & PostgreSQL 11.8

Before

from django.db import models

class Enum(models.Model)
    definition = models.CharField(unique=True, max_length=128)

After

from uuid import uuid4
from django.db import models

class Enum(models.Model)
    definition = models.CharField(unique=True, max_length=128)
    uid = models.UUIDField(default=uuid4, editable=False, unique=True)

Migration

Applying main.0039_enum_uid...Traceback (most recent call last):
  File "/home/xxx/.local/share/virtualenvs/xxx--9c6SIiZ/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
psycopg2.errors.UniqueViolation: could not create unique index "main_enum_uid_key"
DETAIL:  Key (uid)=(cad607b1-6e38-4f99-a5fb-f73c2e3e5ad3) is duplicated.

Change History (1)

comment:1 by Mariusz Felisiak, 5 years ago

Resolution: → duplicate
Status: new → closed
Summary: Adding a UUIDField (default=uuid4, editable=False, unique=True) to an existing model results in IntegrityErrors on the migration → Adding a unique UUIDField with default to an existing model results in IntegrityErrors.

Duplicate of #23932 where the decision was to ​document the solution.

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