#33938: Defining the "through" model in a many-to-many field in another app
causes
"AttributeError: 'str' object has no attribute '_meta'" on migration
-------------------------------------+-------------------------------------
Reporter: bryan.af7 | Owner: Simon
| Charette
Type: Bug | Status: assigned
Component: Migrations | Version: 4.0
Severity: Normal | Resolution:
Keywords: migration many-to- | Triage Stage: Accepted
many bug |
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):
* has_patch: 0 => 1
Comment:
This is a regression in Django 4.0 caused by
aa4acc164d1247c0de515c959f7b09648b57dc42,
[https://github.com/django/django/pull/15973 this PR] should solve it.
You can manually resolve the issue for your project by breaking the
`fonte` migration generated on `makemigration` in two by moving the
`variaveis` out of the `CreateModel` to an `AddField` operation that
depends on the two others.
This can be achieve with `makemigrations` with the following sequence of
operation.
1. Keep your models as they are defined now.
2. Comment the `variaveis` definition.
3. Run `makemigrations`
4. Uncomment `variaveis`
5. Run `makemigrations`
6. Edit the latest migration for `fonte`, the one with the
`AddField('FonteModel', 'variaveis', ...)`, to add an entry in
`dependencies` that refers to the migration where
`fonte_variavel.FonteVariavelModel` is defined when running step 3.
--
Ticket URL: <https://code.djangoproject.com/ticket/33938#comment:3>
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