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Document QuerySet.difference(), intersection(), raw(), select_for_update() as unsupported #441

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Document QuerySet.difference(), intersection(), raw(), select_for_update() as unsupported #441

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Fix indent in docs/ref/models/querysets.rst and simplify link syntax
timgraham Nov 3, 2025
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Document QuerySet.difference(), intersection(), raw(), select_for_upa…
timgraham Nov 3, 2025
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14 changes: 10 additions & 4 deletions docs/ref/models/querysets.rst
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Expand Up @@ -8,12 +8,18 @@ Supported ``QuerySet`` methods
All of Django's :doc:`QuerySet methods <django:ref/models/querysets>` are
supported, except:

- :meth:`extra() <django.db.models.query.QuerySet.extra>`
- :meth:`prefetch_related() <django.db.models.query.QuerySet.prefetch_related>`
- :meth:`~django.db.models.query.QuerySet.difference`
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@timgraham timgraham Nov 4, 2025

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MongoDB has $setDifference and $setIntersection. Not sure if they could be used to emulate. @WaVEV Did this cross your radar when implementing support for union()?

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@WaVEV WaVEV Nov 5, 2025

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Yes, I remember we talked about that, but only union was a priority at that time. I think the difference could be handled with a $lookup for the inner query (a similar flow to unionWith) followed by a $match.

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@timgraham timgraham Nov 6, 2025

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I created INTPYTHON-823 Add support for QuerySet.intersection() and difference().

- :meth:`~django.db.models.query.QuerySet.extra`
- :meth:`~django.db.models.query.QuerySet.intersection`
- :meth:`~django.db.models.query.QuerySet.prefetch_related`
- :meth:`~django.db.models.query.QuerySet.raw` (use
:meth:`~django_mongodb_backend.queryset.MongoQuerySet.raw_aggregate`
instead)
- :meth:`~django.db.models.query.QuerySet.select_for_update` (acts as a no-op)
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@timgraham timgraham Nov 4, 2025 •
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Maybe it can be implemented: https://www.mongodb.com/company/bloghow-to-select-for-update-inside-mongodb-transactions edit: I created INTPYTHON-822 - Add support for QuerySet.select_for_update().


In addition, :meth:`QuerySet.delete() <django.db.models.query.QuerySet.delete>`
and :meth:`update() <django.db.models.query.QuerySet.update>` do not support
queries that span multiple collections.
and :meth:`~django.db.models.query.QuerySet.update` do not support queries that
span multiple collections.

.. _queryset-explain:

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15 changes: 11 additions & 4 deletions docs/topics/known-issues.rst
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Expand Up @@ -31,12 +31,19 @@ Querying

- The following ``QuerySet`` methods aren't supported:

- :meth:`extra() <django.db.models.query.QuerySet.extra>`
- :meth:`prefetch_related() <django.db.models.query.QuerySet.prefetch_related>`
- :meth:`~django.db.models.query.QuerySet.difference`
- :meth:`~django.db.models.query.QuerySet.extra`
- :meth:`~django.db.models.query.QuerySet.intersection`
- :meth:`~django.db.models.query.QuerySet.prefetch_related`
- :meth:`~django.db.models.query.QuerySet.raw` (use
:meth:`~django_mongodb_backend.queryset.MongoQuerySet.raw_aggregate`
instead)
- :meth:`~django.db.models.query.QuerySet.select_for_update` (acts as a
no-op)

- :meth:`QuerySet.delete() <django.db.models.query.QuerySet.delete>` and
:meth:`update() <django.db.models.query.QuerySet.update>` do not support queries
that span multiple collections.
:meth:`~django.db.models.query.QuerySet.update` do not support queries that
span multiple collections.

- When querying :class:`~django.db.models.JSONField`:

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