Optimize API

api/views.py

@@ -63,7 +63,7 @@ class UserElectionsView(JsonView):
         elections = []
         for voter in qs:
             election = election_as_dict(voter.election)
-            election["user_has_voted"] = voter.vote is not None
+            election["user_has_voted"] = voter.vote_hash is not None
             elections.append(election)
 
         return {"username": username, "elections": elections}
@@ -80,11 +80,13 @@ class ElectionVotersView(JsonView):
         result["voters"] = []
 
         voters = (
-            election.voter_set.all().select_related("user").order_by("user__user_id")
+            election.voter_set.all()
+            .values_list("user__user_id", "vote_hash")
+            .order_by("user__user_id")
         )
-        for voter in voters:
+        for user_id, vote_hash in voters:
             result["voters"].append(
-                {"username": voter.user.user_id, "has_voted": voter.vote is not None}
+                {"username": user_id, "has_voted": vote_hash is not None}
             )
 
         return result