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Code Issues 25 Releases Wiki Activity

Fixed #27414 -- Doc'd that F() expressions on relations return pk values.

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Jop Reyntjes 2016-11-05 21:49:48 +00:00 committed by Tim Graham
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commit f8fab6f902
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docs/ref/models/expressions.txt
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@ -214,6 +214,15 @@ directly support ``output_field`` you will need to wrap the expression with
expires=ExpressionWrapper(
F('active_at') + F('duration'), output_field=DateTimeField()))
When referencing relational fields such as ``ForeignKey``, ``F()`` returns the
primary key value rather than a model instance::
>> car = Company.objects.annotate(built_by=F('manufacturer'))[0]
>> car.manufacturer
<Manufacturer: Toyota>
>> car.built_by
3
.. _func-expressions:
``Func()`` expressions