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[1.4.X] Fixed #18046 - Documented that an index is created by default for ForeignKeys; thanks jbauer for the suggestion.

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Backport of db598dd8a0 from master
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Tim Graham 2012-10-16 16:12:52 -04:00
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docs/ref/models/fields.txt
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@ -972,6 +972,12 @@ need to use::
This sort of reference can be useful when resolving circular import This sort of reference can be useful when resolving circular import
dependencies between two applications. dependencies between two applications.
A database index is automatically created on the ``ForeignKey``. You can
disable this by setting :attr:`~Field.db_index` to ``False``. You may want to
avoid the overhead of an index if you are creating a foreign key for
consistency rather than joins, or if you will be creating an alternative index
like a partial or multiple column index.
Database Representation Database Representation
~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~