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Fixed #21499 -- Added a paragraph to the docs.

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Raphael Jasjukaitis 2013-11-24 15:26:45 +01:00
parent 033b26173b
commit 455e2896b1
1 changed files with 9 additions and 0 deletions
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docs/topics/migrations.txt
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@ -244,6 +244,15 @@ it's entirely possible to write them manually if you need to. Some of the
more complex operations are not autodetectable and are only available via
a hand-written migration, so don't be scared about editing them if you have to.
Custom fields
~~~~~~~~~~~~~
You can't modify the number of positional arguments in an already migrated
custom field without raising a TypeError. The old migration will call the
modified ``__init__`` method with the old signature. So if you need a new
argument, please create a keyword argument and use e.g.
``assert kwargs.get('argument_name') is not None`` in the constructor.
Adding migrations to apps
-------------------------