François Freitag 3fca95e1ad Fixed #28312 -- Made ModelChoiceIterator.__len__() more memory-efficient. ...

Instead of loading all QuerySet results in memory, count the number of
entries. This adds an extra query when list() or tuple() is called on the
choices (because both call __len__() then __iter__()) but uses less
memory since the QuerySet results won't be cached. In most cases, the
choices will only be iterated on, meaning that __len__() won't be called
and only one query will be executed.

2018-04-23 12:39:43 -04:00

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