Django REST Framework：如何组合两个查询集？

Question

I'm trying to combine two filters which are referred to a FK in an object but I'm getting wrong and redundant data.

Below presented the filters, located in views.py:

class RecordFilter(df.FilterSet):
    user = df.CharFilter(name='active_states__user', method='filter_user')
    activestate = df.BooleanFilter(name='active_states__is_active', method='filter_is_active')

    class Meta:
        model = Record
        fields = ['type', 'group', 'user', 'activestate']

    def filter_user(self, queryset, _, value):
        return queryset.filter(active_states__user_id=value)

    def filter_is_active(self, queryset, _, value):
        return queryset.filter(active_states__is_active=value)

For example in my test case I created 4 record objects and I added to them activestate and user.

record1.set_active_states_for_users([user1.uuid], True)
record2.set_active_states_for_users([user1.uuid], False)
record2.set_active_states_for_users([user2.uuid], True)
record3.set_active_states_for_users([user2.uuid], False)

I tried to test these filters for user=user2 and activestate=True. And I'm getting:

• Two times the record2 because of activestate=True and user=user2
• One time the record3 because of user=user2

The result should be only the record2.

I noticed that the chain could do the concatenation of the querysets, but I don't know how can I use it in my views.py in class RecordFilter. Do you have any clue?

Answer 1

You have situation described here . It is possible to implement this API:

class RecordFilter(df.FilterSet):
    active_user = df.CharFilter(method='filter_active_user')
    disabled_user = df.CharFilter(method='filter_disabled_user')

    class Meta:
        model = Record
        fields = ['type', 'group', 'user']

def filter_active_user(self, queryset, name, value):
    return queryset.filter(active_states__is_active=True,
                           active_states__user_id=value)

def filter_disabled_user(self, queryset, name, value):
    return queryset.filter(active_states__is_active=False,
                           active_states__user_id=value)

So you can filter both any, only disabled and only enabled users. Query active_user=user2 will return just record2.

But I don't know why do you use CharFilter for user and filter queryset like active_states__user_id=value . Looks like mistake if id is not a string.