#24725: "ProgrammingError: relation does not exist" when renaming many-to-many
target model
---------------------------------+------------------------------------
Reporter: dbrgn | Owner: MarkusH
Type: Bug | Status: assigned
Component: Migrations | Version: 1.8
Severity: Release blocker | Resolution:
Keywords: migrations | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
---------------------------------+------------------------------------
Changes (by MarkusH):
* status: new => assigned
* owner: nobody => MarkusH
* needs_tests: 0 => 1
* needs_docs: 0 => 1
Comment:
I localized the error to these four lines:
https://github.com/django/django/blob/master/django/db/migrations/operations/models.py#L162-L165
They wrongly filter out `<ManyToManyRel: debug.john>` on the model
`debug.Spam` (i.e. `__fake__.Spam`):
{{{#!python
ipdb> model._meta.get_fields(include_hidden=True)
(<ManyToOneRel: debug.john_consumed_food>, <ManyToManyRel: debug.john>,
<django.db.models.fields.AutoField: id>,
<django.db.models.fields.CharField: description>)
ipdb> field = model._meta.get_fields(include_hidden=True)[0]
ipdb> field
<ManyToOneRel: debug.john_consumed_food>
ipdb> field.auto_created
True
ipdb> field.concrete
False
ipdb> field.hidden
True
ipdb> field.many_to_many
False
ipdb> field = model._meta.get_fields(include_hidden=True)[1]
ipdb> field
<ManyToManyRel: debug.john>
ipdb> field.auto_created
True
ipdb> field.concrete
False
ipdb> field.hidden
False
ipdb> field.many_to_many
True
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/24725#comment:5>
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