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Inlined a note in docs/ref/models/expressions.txt.

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Tim Graham 2016-11-09 08:20:30 -05:00
parent f8fab6f902
commit 0d6c7cae7c
1 changed files with 4 additions and 7 deletions
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docs/ref/models/expressions.txt
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@ -119,14 +119,11 @@ know about it - it is dealt with entirely by the database. All Python does,
through Django's ``F()`` class, is create the SQL syntax to refer to the field through Django's ``F()`` class, is create the SQL syntax to refer to the field
and describe the operation. and describe the operation.
.. note:: To access the new value saved this way, the object must be reloaded::
In order to access the new value that has been saved in this way, the object reporter = Reporters.objects.get(pk=reporter.pk)
will need to be reloaded:: # Or, more succinctly:
reporter.refresh_from_db()
reporter = Reporters.objects.get(pk=reporter.pk)
# Or, more succinctly:
reporter.refresh_from_db()
As well as being used in operations on single instances as above, ``F()`` can As well as being used in operations on single instances as above, ``F()`` can
be used on ``QuerySets`` of object instances, with ``update()``. This reduces be used on ``QuerySets`` of object instances, with ``update()``. This reduces