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[3.0.x] Fixed #27462 -- Clarifed pk_set difference in m2m_changed signal receivers for add() and remove(). 

Thank you to Mariusz Felisiak for review.

Backport of bae05bcf68 from master
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Carlton Gibson 2019-09-18 16:08:56 +02:00
parent e74ca0226a
commit e4dc1b8cac
1 changed files with 10 additions and 3 deletions
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13
docs/ref/signals.txt
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@ -270,9 +270,16 @@ Arguments sent with this signal:
from the relation.
``pk_set``
For the ``pre_add``, ``post_add``, ``pre_remove`` and ``post_remove``
actions, this is a set of primary key values that have been added to
or removed from the relation.
For the ``pre_add`` and ``post_add`` actions, this is a set of primary key
values that will be, or have been, added to the relation. This may be a
subset of the values submitted to be added, since inserts must filter
existing values in order to avoid a database ``IntegrityError``.
For the ``pre_remove`` and ``post_remove`` actions, this is a set of
primary key values that was submitted to be removed from the relation. This
is not dependent on whether the values actually will be, or have been,
removed. In particular, non-existent values may be submitted, and will
appear in ``pk_set``, even though they have no effect on the database.
For the ``pre_clear`` and ``post_clear`` actions, this is ``None``.