Doc'd how to remove old references in migration files.
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@ -384,6 +384,9 @@ contains a reference to them. On the plus side, methods and managers from these
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base classes inherit normally, so if you absolutely need access to these you
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can opt to move them into a superclass.
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To remove old references, you can :ref:`squash migrations <migration-squashing>`
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or, if there aren't many references, copy them into the migration files.
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.. _migrations-removing-model-fields:
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Considerations when removing model fields
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