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Fixed #23131 -- Documented serialization of callable functions in migrations.
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@ -331,6 +331,10 @@ They will, however, have the same fields, relationships and ``Meta`` options
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when you access them in migrations, and you will NOT have any custom
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constructors or instance methods. Plan appropriately!
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References to functions in field options such as ``upload_to`` and
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``limit_choices_to`` are serialized in migrations, so the functions will need
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to be kept around for as long as there is a migration referencing them.
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In addition, the base classes of the model are just stored as pointers,
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so you must always keep base classes around for as long as there is a migration
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that contains a reference to them. On the plus side, methods and managers
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