Django - Filter Queryset With Another Modal's Field

Question

I have two modals: Group and GroupContents.

GroupContents Modal:

class GroupContents(models.Model):
    group = models.ForeignKey(Group, on_delete=models.CASCADE, null=True, blank=True)
    content= models.TextField(max_length=180)

Group Modal:

class Group(models.Model):
    name = models.CharField(max_length=255, unique=True)
    description = models.TextField(blank=True, max_length=80, default='')
    private= models.TextField(blank=False, default='0')

I want to filter my GroupContents queryset as releated Group object not private. I don't know how to solve that. I tried this but didn't work:

class GroupContentsViewSet(viewsets.ModelViewSet):

    serializer_class = GroupContentsSerializer
    authentication_classes = (JSONWebTokenAuthentication,)
    permission_classes = (IsAuthenticatedOrReadOnly,)

    def get_queryset(self):
        queryset = GroupContents.objects.filter(self.group.secret=0)
        return queryset

I don't know how to approach. Thanks a lot...

Answer 1

You can .filter(…) ^[Django-doc] with:

class GroupContentsViewSet(viewsets.ModelViewSet):

    serializer_class = GroupContentsSerializer
    authentication_classes = (JSONWebTokenAuthentication,)
    permission_classes = (IsAuthenticatedOrReadOnly,)

    def get_queryset(self):
        return GroupContents.objects.filter(group__private='0')

It looks however strange to use a TextField, and not a simple BooleanField ^[Django-doc].

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Note: normally a Django model is given a singular name, so GroupContent instead of GroupContents.