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问题描述
不知道怎么可能:
A = object_list.filter( Q(sales__sale_starts__lte=today) & Q(sales__sale_ends__gte=today) )
# query inside filter catches 2 objects
B = object_list.exclude( Q(sales__sale_starts__lte=today) & Q(sales__sale_ends__gte=today) )
# query inside exclude catches 3 objects,
# though it is the same as previous
# in other words: object_list contains 20 objects,
# A - 2 objects, and B - 17 objects
使用 Q 对象时， filter()和 exclude()的工作方式是否有区别?谢谢.
Is there any difference in how filter() and exclude() working when using Q objects? Thanks.
我希望 B 与以下内容相同:
I expect B to be as in:
B = object_list.difference(A)
# B contains 18 objects
推荐答案
如@PauloAlmeida所说
As @PauloAlmeida said
由于不同的sql生成，因此 filter()和 exclude()之间确实存在差异.也许是 exclude()中的错误.
So there is indeed can be a difference between filter() and exclude(), because of different sql generation. And maybe bugs in exclude().
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