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Fixed #27666 -- Delayed rendering of recursivly related models in migration operations.

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Markus Holtermann
2016-11-06 12:03:05 +01:00
committed by Tim Graham
parent 7d2db2a7b8
commit 45ded053b1
7 changed files with 92 additions and 15 deletions
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11
docs/releases/1.11.txt
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@@ -593,6 +593,17 @@ must receive a dictionary of context rather than ``Context`` or
dictionary instead -- doing so is backwards-compatible with older versions of
Django.
Model state changes in migration operations
-------------------------------------------
To improve the speed of applying migrations, rendering of related models is
delayed until an operation that needs them (e.g. ``RunPython``). If you have a
custom operation that works with model classes or model instances from the
``from_state`` argument in ``database_forwards()`` or ``database_backwards()``,
you must render model states using the ``clear_delayed_apps_cache()`` method as
described in :ref:`writing your own migration operation
<writing-your-own-migration-operation>`.
Miscellaneous
-------------