#24026: migration RunPython operation ignores db router allow_migrate
----------------------------+-----------------------
Reporter: dikamilo | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7
Severity: Normal | Keywords: migration
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+-----------------------
I wrote custom router for SaaS architecture to handle different databases
and custom management command to apply migrations for all databases. I'm
sure that this router and command works properly.
All migrations works fine except migrations with {{{RunPython}}} command
in operations - that migrations are executed ignoring {{{allow_migrate}}}
policy in database router.
For example in one of my app i have several migrations generated by django
(manage.py makemigrations). My router checks if given app models should be
in given database and if it return False, django not create table, not
change schema etc. All works just fine and model is not in database. But
if I create empty migration and add RunPython operation that add initial
data to database for given model, django execute this migration throwing
out error {{{django.db.utils.OperationalError: no such table}}}.
I checked django code and for example in {{{AlterModelTable}}} operation
{{{database_forwards}}} method uses {{{self.allowed_to_migrate}}}:
{{{
def database_forwards(self, app_label, schema_editor, from_state,
to_state):
old_apps = from_state.render()
new_apps = to_state.render()
old_model = old_apps.get_model(app_label, self.name)
new_model = new_apps.get_model(app_label, self.name)
if self.allowed_to_migrate(schema_editor.connection.alias,
new_model):
schema_editor.alter_db_table(
new_model,
old_model._meta.db_table,
new_model._meta.db_table,
)
}}}
To compare RunPython {{{database_forwards}}} method look like this (cut
comments):
{{{
def database_forwards(self, app_label, schema_editor, from_state,
to_state):
self.code(from_state.render(), schema_editor)
}}}
I think it's a bug and {{{RunPython}}} command should use
{{{self.allowed_to_migrate}}} too.
--
Ticket URL: <https://code.djangoproject.com/ticket/24026>
Django <https://code.djangoproject.com/>
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