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[1.7.x] Fixed #23131 -- Documented serialization of callable function…

…s in migrations.

Backport of 50ae4b4 from master
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commit 8c8ce2ee64b098dc52ebda7ce95644cb7c2f9cb2 1 parent da2077e
@timgraham timgraham authored
Showing with 4 additions and 0 deletions.
  1. +4 −0 docs/topics/migrations.txt
4 docs/topics/migrations.txt
@@ -331,6 +331,10 @@ They will, however, have the same fields, relationships and ``Meta`` options
when you access them in migrations, and you will NOT have any custom
constructors or instance methods. Plan appropriately!
+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.
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
that contains a reference to them. On the plus side, methods and managers

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