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Fixed #17388 - Noted in the custom model field docs that field method…

…s need to handle None if the field may be null.
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1 parent 0b908b9 commit 4cef9a09f9b0d89abf323a1cf8b9e8354e316c18 @timgraham timgraham committed Oct 19, 2012
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  1. +7 −0 docs/howto/custom-model-fields.txt
@@ -448,6 +448,13 @@ called when it is created, you should be using `The SubfieldBase metaclass`_
mentioned earlier. Otherwise :meth:`.to_python` won't be called
+.. warning::
+ If your custom field allows ``null=True``, any field method that takes
+ ``value`` as an argument, like :meth:`~Field.to_python` and
+ :meth:`~Field.get_prep_value`, should handle the case when ``value`` is
+ ``None``.
Converting Python objects to query values

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