.. _migrations_autodetector:

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**Migrations autodetector**
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- https://docs.djangoproject.com/en/dev/releases/4.0/#migrations-autodetector-changes


The migrations autodetector now uses **model states** instead of **model classes**.

Also, migration operations for ForeignKey and ManyToManyField fields no
longer specify attributes which were not passed to the fields during
initialization.

As a side-effect, running makemigrations might generate no-op AlterField
operations for ManyToManyField and ForeignKey fields in some cases.