#33586: Cannot delete object (A) referenced by another object (B) if said object
(A) has a foreign key to a custom user.
-------------------------------+------------------------------------
Reporter: Jeremy Poulin | Owner: (none)
Type: Bug | Status: new
Component: Migrations | Version: 4.0
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
-------------------------------+------------------------------------
Comment (by madhuri2):
Is this issue fixed?
I was working on this issue and I found this error **ValueError: Cannot
query "A object(1)": Must be "A" instance.
**
Then I tried this
I removed the migrations file.
Then applied migrations.
Unapplied all migrations using: ''python manage.py migrate rmigrate zero''
and it worked!
{{{
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py makemigrations
←[36;1mMigrations for 'rmigrate':←[0m
←[1mrmigrate\migrations\0001_initial.py←[0m
- Create model User
- Create model A
- Create model B
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py migrate
←[36;1mOperations to perform:←[0m
←[1m Apply all migrations: ←[0madmin, auth, contenttypes, rmigrate,
sessions
←[36;1mRunning migrations:←[0m
No migrations to apply.
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py migrate rmigrate zero
←[36;1mOperations to perform:←[0m
←[1m Unapply all migrations: ←[0mrmigrate
←[36;1mRunning migrations:←[0m
Rendering model states...←[32;1m DONE←[0m
Unapplying admin.0003_logentry_add_action_flag_choices...←[32;1m OK←[0m
Unapplying admin.0002_logentry_remove_auto_add...←[32;1m OK←[0m
Unapplying admin.0001_initial...←[32;1m OK←[0m
Unapplying rmigrate.0001_initial...←[32;1m OK←[0m
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py migrate
←[36;1mOperations to perform:←[0m
←[1m Apply all migrations: ←[0madmin, auth, contenttypes, rmigrate,
sessions
←[36;1mRunning migrations:←[0m
Applying rmigrate.0001_initial...←[32;1m OK←[0m
Applying admin.0001_initial...←[32;1m OK←[0m
Applying admin.0002_logentry_remove_auto_add...←[32;1m OK←[0m
Applying admin.0003_logentry_add_action_flag_choices...←[32;1m OK←[0m
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py makemigrations
No changes detected
(venv) PS C:\Users\Madhu\Desktop\Django\ticket33586\rmigration_bug> python
manage.py migrate
←[36;1mOperations to perform:←[0m
←[1m Apply all migrations: ←[0madmin, auth, contenttypes, rmigrate,
sessions
←[36;1mRunning migrations:←[0m
No migrations to apply.
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/33586#comment:24>
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