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Diffstat (limited to 'docs/howto/writing-migrations.txt')
| -rw-r--r-- | docs/howto/writing-migrations.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/howto/writing-migrations.txt b/docs/howto/writing-migrations.txt index 59a636626a..37a8b4ed5a 100644 --- a/docs/howto/writing-migrations.txt +++ b/docs/howto/writing-migrations.txt @@ -46,7 +46,7 @@ method of database routers as ``**hints``: class MyRouter(object): - def allow_migrate(self, db, model, **hints): + def allow_migrate(self, db, app_label, model_name=None, **hints): if 'target_db' in hints: return db == hints['target_db'] return True @@ -68,6 +68,10 @@ Then, to leverage this in your migrations, do the following:: migrations.RunPython(forwards, hints={'target_db': 'default'}), ] +If your ``RunPython`` or ``RunSQL`` operation only affects one model, it's good +practice to pass ``model_name`` as a hint to make it as transparent as possible +to the router. This is especially important for reusable and third-party apps. + Migrations that add unique fields ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |