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[1.10.x] Doc'd how to remove old references in migration files.

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Backport of 5bd967e1c52bfe811daffaccd3ef8964f8a3cb35 from master
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Tim Graham 2016-09-02 09:59:40 -04:00
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docs/topics/migrations.txt
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@ -386,6 +386,9 @@ contains a reference to them. On the plus side, methods and managers from these
base classes inherit normally, so if you absolutely need access to these you
can opt to move them into a superclass.
To remove old references, you can :ref:`squash migrations <migration-squashing>`
or, if there aren't many references, copy them into the migration files.
.. _migrations-removing-model-fields:
Considerations when removing model fields