overide filters for groups and group lists

- use more sensible query for displaying groups on user page
- privacy_filter now allows group members to see followers_only and private lists and groups they would otherwise not see

bookwyrm/models/group.py

@@ -19,6 +19,22 @@ class Group(BookWyrmModel):
         """don't want the user to be in there in this case"""
         return f"https://{DOMAIN}/group/{self.id}"
 
+    @classmethod
+    def followers_filter(cls, queryset, viewer):
+        """Override filter for "followers" privacy level to allow non-following group members to see the existence of groups and group lists"""
+
+        return queryset.exclude(
+            ~Q(  # user isn't following and it isn't their own status and they are not a group member
+                Q(user__followers=viewer) | Q(user=viewer) | Q(memberships__user=viewer)
+            ),
+            privacy="followers",  # and the status of the group is followers only
+        )
+
+    @classmethod
+    def direct_filter(cls, queryset, viewer):
+        """Override filter for "direct" privacy level to allow group members to see the existence of groups and group lists"""
+
+        return queryset.exclude(~Q(memberships__user=viewer), privacy="direct")
 
 class GroupMember(models.Model):
     """Users who are members of a group"""

bookwyrm/models/list.py

@@ -1,6 +1,7 @@
 """ make a list of books!! """
 from django.apps import apps
 from django.db import models
+from django.db.models import Q
 from django.utils import timezone
 
 from bookwyrm import activitypub
@@ -71,6 +72,22 @@ class List(OrderedCollectionMixin, BookWyrmModel):
             return
         super().raise_not_editable(viewer)
 
+    @classmethod
+    def followers_filter(cls, queryset, viewer):
+        """Override filter for "followers" privacy level to allow non-following group members to see the existence of group lists"""
+
+        return queryset.exclude(
+            ~Q(  # user isn't following and it isn't their own status and they are not a group member
+                Q(user__followers=viewer) | Q(user=viewer) | Q(group__memberships__user=viewer)
+            ),
+            privacy="followers",  # and the status (of the list) is followers only
+        )
+
+    @classmethod
+    def direct_filter(cls, queryset, viewer):
+        """Override filter for "direct" privacy level to allow group members to see the existence of group lists"""
+
+        return queryset.exclude(~Q(group__memberships__user=viewer), privacy="direct")
 
 class ListItem(CollectionItemMixin, BookWyrmModel):
     """ok"""