change group owner from 'manager' to 'user'

This will allow privacy management to use existing code.
Some template updates also are for rationalising how
groups are created and edited.

bookwyrm/models/base_model.py

@@ -76,6 +76,10 @@ class BookWyrmModel(models.Model):
                 and self.mention_users.filter(id=viewer.id).first()
             ):
                 return True
+
+# TODO: if privacy is direct and the object is a group and viewer is a member of the group
+# then return True
+
         return False
 
 

bookwyrm/models/group.py

@@ -12,7 +12,7 @@ class Group(BookWyrmModel):
     """A group of users"""
 
     name = fields.CharField(max_length=100)
-    manager = fields.ForeignKey(
+    user = fields.ForeignKey(
         "User", on_delete=models.PROTECT)
     description = fields.TextField(blank=True, null=True)
     privacy = fields.PrivacyField()

bookwyrm/models/list.py

@@ -36,9 +36,10 @@ class List(OrderedCollectionMixin, BookWyrmModel):
     )
     group = models.ForeignKey(
         "Group",
-        on_delete=models.CASCADE,
+        on_delete=models.PROTECT,
         default=None,
-        blank=True
+        blank=True,
+        null=True,
     )
     books = models.ManyToManyField(
         "Edition",