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[1.7.x] Note re migrations importing custom fields 

Backport of b4d486c80f from master
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Greg Brown 2014-09-10 09:52:44 +12:00 committed by Tim Graham
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docs/topics/migrations.txt
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@ -333,7 +333,9 @@ They will, however, have the same fields, relationships and ``Meta`` options
References to functions in field options such as ``upload_to`` and
``limit_choices_to`` are serialized in migrations, so the functions will need
to be kept around for as long as there is a migration referencing them.
to be kept around for as long as there is a migration referencing them. Any
:doc:`custom model fields </howto/custom-model-fields>` will also need to be
kept, since these are imported directly by migrations.
In addition, the base classes of the model are just stored as pointers,
so you must always keep base classes around for as long as there is a migration