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Fixed #22496: Data migrations get transactions again!

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This commit is contained in:
Andrew Godwin 2014-05-07 14:28:34 -07:00
parent e9a456d11b
commit 5a917cfef3
5 changed files with 65 additions and 4 deletions
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8
docs/ref/migration-operations.txt
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@ -178,7 +178,7 @@ operation that adds that field and so will try to run it again).
RunPython
---------
.. class:: RunPython(code, reverse_code=None)
.. class:: RunPython(code, reverse_code=None, atomic=True)
Runs custom Python code in a historical context. ``code`` (and ``reverse_code``
if supplied) should be callable objects that accept two arguments; the first is
@ -230,6 +230,12 @@ or that you use :class:`SeparateDatabaseAndState` to add in operations that will
reflect your changes to the model state - otherwise, the versioned ORM and
the autodetector will stop working correctly.
By default, ``RunPython`` will run its contents inside a transaction even
on databases that do not support DDL transactions (for example, MySQL and
Oracle). This should be safe, but may cause a crash if you attempt to use
the ``schema_editor`` provided on these backends; in this case, please
set ``atomic=False``.
SeparateDatabaseAndState
------------------------