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Django 3.0.2 release notes

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*January 2, 2020*

Django 3.0.2 fixes several bugs in 3.0.1.

Bugfixes

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* Fixed a regression in Django 3.0 that didn't include columns referenced by a

  ``Subquery()`` in the ``GROUP BY`` clause (:ticket:`31094`).

* Fixed a regression in Django 3.0 where ``QuerySet.exists()`` crashed if a

  queryset contained an aggregation over a ``Subquery()`` (:ticket:`31109`).

* Fixed a regression in Django 3.0 that caused a migration crash on PostgreSQL

  10+ when adding a foreign key and changing data in the same migration

  (:ticket:`31106`).

* Fixed a regression in Django 3.0 where loading fixtures crashed for models

  defining a :attr:`~django.db.models.Field.default` for the primary key

  (:ticket:`31071`).