is_joinable -> join_rule

synapse/groups/groups_server.py

@@ -746,7 +746,7 @@ class GroupsServerHandler(object):
         group_info = yield self.store.get_group(
             group_id,
         )
-        if not group_info['is_joinable']:
+        if group_info['join_policy'] != "open":
             raise SynapseError(403, "Group is not publicly joinable")
 
         local_attestation = yield self.add_user(group_id, requester_user_id, content)

synapse/storage/group_server.py

@@ -57,15 +57,12 @@ class GroupServerStore(SQLBaseStore):
             },
             retcols=(
                 "name", "short_description", "long_description",
-                "avatar_url", "is_public", "is_joinable",
+                "avatar_url", "is_public", "join_rule",
             ),
             allow_none=True,
             desc="get_group",
         )
 
-        if ret and 'is_joinable' in ret:
-            ret['is_joinable'] = bool(ret['is_joinable'])
-
         defer.returnValue(ret)
 
     def get_users_in_group(self, group_id, include_private=False):