Question

I am using Django framework, appengine database.

My code for model is:

class Group(models.Model):
    name = models.CharField(max_length=200)
    ispublic = models.BooleanField()
    logo = models.CharField(max_length=200)
    description = models.CharField(max_length=200)
    groupwebsite = models.CharField(max_length=200)
    owner = models.ForeignKey('profile')


class Group_members(models.Model):
    profile = models.CharField(max_length=200)
    group = models.ForeignKey('group')

I am querying on Group_members to remove group. My query is as follows:

groups = Group_members.objects.filter(Q(profile=profile.id),~Q(group__in=group_id)

INFO:

1. group_id = ['128','52']
2. group is a foreign key to group model

My problem is when I run this query, it throws Database error: Lookup type 'in' can't be negated.

I have also performed query using __in it worked fine but does not work for foreign key.

Thanks in advance

Answer 1

I think you trying to filter profile id and remove groups in group_id in single filter

groups = Group_members.objects.filter(Q(profile=profile.id),~Q(group__in=group_id)

instead try this:

1)first filter the profiles form group_member :

groups = Group_members.objects.filter(profile=profile.id)

2)remove the groups form Queryset by:

groupId = [x.group.id for x in groups if x.group.id not in group_id]

Hope this will give you perfect result