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3 commits

Author SHA1 Message Date
François Freitag
a2e97abd81 Fixed #29159 -- Made ModelChoiceIterator reuse QuerySet result cache. 
When __len__() is called (e.g. when casting to list or tuple), the
QuerySet is evaluated and the result cache populated. iterator()
shouldn't be called on the QuerySet after that, as it would reset the
result cache and trigger a second query.
 2018-03-01 14:17:56 -05:00
François Freitag
40f0aa9885 Fixed #29158 -- Fixed len(choices) crash if ModelChoiceField's queryset is a manager. 
Removing all() in __iter__() prevents a duplicate query when choices are
cast to a list and there's a prefetch_related().
 2018-03-01 14:12:14 -05:00
François Freitag
06172d7bc2 Consolidated ModelChoiceField tests. 2018-03-01 14:05:35 -05:00