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

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commit 455e2896b122a331057483634bea9c8074bdc97d 1 parent 033b261
Raphael Jasjukaitis authored
Showing with 9 additions and 0 deletions.
  1. +9 −0 docs/topics/migrations.txt
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9 docs/topics/migrations.txt
@@ -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
-------------------------
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