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Refs #30083 -- Added a warning about performing queries in pre/post_init receivers.

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Thanks Carlton Gibson the review.
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Mariusz Felisiak 2019-07-19 13:05:31 +02:00
parent a2e1c17f19
commit fc1182af01
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6
docs/ref/signals.txt
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@ -106,6 +106,12 @@ Arguments sent with this signal:
``_state.db`` is ``None`` and cannot be used to check an ``instance`` ``_state.db`` is ``None`` and cannot be used to check an ``instance``
database. database.
.. warning::
For performance reasons, you shouldn't perform queries in receivers of
``pre_init`` or ``post_init`` signals because they would be executed for
each instance returned during queryset iteration.
``pre_save`` ``pre_save``
------------ ------------