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我目前正在用注释和包含的运算符来操作django querysets的行为|和&在合并两个查询集后保留queryset注释
我有模式是这样的:
class Property(models.Model):
value = models.IntegerField(null=True)
obj = PropertyManager()
class Profile(models.Model):
name = models.CharField()
values = models.ManyToManyField(Property)
class PropertyManager(models.Manager):
def included(self, profile):
super(PropertyManager, self).filter(Q(property__profile=profile)).annotate(included_value=Value('true', output_field=CharField()))
def excluded(self, profile):
super(PropertyManager, self).filter(~Q(property__profile=profile)).annotate(included_value=Value('false', output_field=CharField()))
def included_excluded(self, profile):
return (self.excluded(profile) | self.included(profile)).distinct()
我天真地预计included_excluded
函数返回与他们的注释都查询集的加入queryset的,如:
property_id | included_value
------------|---------------
1 | true
2 | false
但事实证明, ,我的示例中注释被覆盖:
j = Profile.objects.get(id=1)
exc = Property.obj.excluded(profile=j)
inc = Property.obj.included(profile=j)
all = Property.obj.included_excluded(profile=j)
len(inc) => 14
len(exc) => 17
len(all) => 31
all.values_list("included_value") => <QuerySet [('false',)]>
exc.values_list("included_value") => <QuerySet [('false',)]>
inc.values_list("included_value") => <QuerySet [('true',)]>
如我所料,
all
显然不是所有注解中的正确值。
所以我想知道,如果有连接两个查询集,并保持我前面