#24686: Support for Moving a model between two Django apps
-------------------------------+------------------------------------
Reporter: Alex Rothberg | Owner: nobody
Type: New feature | Status: new
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 1
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by wtayyeb):
Hi again.
Unlike my previous comment and approach, I found that `RenameModel`
operation is well written even for moving models, so I update it and
`MigrationAutodetector` to handle moving models.
The move mechanism is completely without `SeparateDatabaseAndState` and it
will produce at least 2 migrations one for old_app and one for new_app
like below.
00zz_new_created_migration_at_old_app.py
{{{#!python
class Migration(migrations.Migration):
dependencies = [
('new_app', '00xx_some_migration'),
('old_app', '00yy_pre_migration'),
# ...
]
operations = [
operations.RenameModel(
old_name='MyModel',
new_name='MyModel',
new_app_label='new_app',
),
]
}}}
00vv_new_created_migration_at_new_app.py
{{{#!python
class Migration(migrations.Migration):
initial = True
dependencies = [
('new_app', '00xx_some_migration'),
('old_app', '00zz_new_created_migration_at_old_app'),
]
operations = [
operations.MoveModelPlaceholder(
old_name='MyModel',
new_name='MyModel',
new_app_label='new_app',
comment='this is a required noop operation to construct
dependencies for moving model',
),
]
}}}
note that `MoveModelPlaceholder` is a noop operation to construct the
dependencies and let forward and backward migrations without problem.
the code is in [https://github.com/django/django/pull/11920 PR]
--
Ticket URL: <https://code.djangoproject.com/ticket/24686#comment:13>
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