Add a default `last_topic` to the PrivateUserNode

server/users/schema/types.py

@@ -11,6 +11,7 @@ from graphql_relay import to_global_id
 from api.types import FailureNode
 
 from books.models import Module
+from books.models.topic import Topic
 from books.schema.nodes import ModuleLevelNode
 from books.schema.queries import ModuleNode
 from users.models import SchoolClass, SchoolClassMember, Team, User
@@ -104,7 +105,7 @@ class PrivateUserNode(DjangoObjectType):
             "onboarding_visited",
             "team",
             "read_only",
-            "last_module_level"
+            "last_module_level",
         ]
         interfaces = (relay.Node,)
 
@@ -142,6 +143,12 @@ class PrivateUserNode(DjangoObjectType):
     def resolve_is_teacher(root: User, info):
         return root.is_teacher()
 
+    @staticmethod
+    def resolve_last_topic(root: User, info):
+        if root.last_topic is not None:
+            return root.last_topic
+        return Topic.objects.first()
+
     @staticmethod
     def resolve_school_classes(root: User, info):
         if root.selected_class is None:  # then we don't have any class to return
@@ -164,7 +171,6 @@ class PrivateUserNode(DjangoObjectType):
         return self.team
 
 
-
 class ClassMemberNode(ObjectType):
     """
     We need to build this ourselves, because we want the active property on the node, because providing it on the