[2.2.x] Fixed #30955 -- Doc'd that only concrete base models are stored in historical models bases.
Abstract models are removed from bases when generating historical model state since 6436f1fad9ce51f18735106ac75aeea3d6d1f310. Backport of 8058d9d7adb189fec75a4b57565f225996c7b22c from master.
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@ -414,11 +414,11 @@ classes will need to be kept around for as long as there is a migration
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referencing them. Any :doc:`custom model fields </howto/custom-model-fields>`
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referencing them. Any :doc:`custom model fields </howto/custom-model-fields>`
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will also need to be kept, since these are imported directly by migrations.
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will also need to be kept, since these are imported directly by migrations.
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In addition, the base classes of the model are just stored as pointers, so you
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In addition, the concrete base classes of the model are stored as pointers, so
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must always keep base classes around for as long as there is a migration that
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you must always keep base classes around for as long as there is a migration
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contains a reference to them. On the plus side, methods and managers from these
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that contains a reference to them. On the plus side, methods and managers from
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base classes inherit normally, so if you absolutely need access to these you
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these base classes inherit normally, so if you absolutely need access to these
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can opt to move them into a superclass.
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you 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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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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or, if there aren't many references, copy them into the migration files.
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