Optimized number of queries for motion serializing. Fixed #1655.

openslides/motions/serializers.py

@@ -120,25 +120,34 @@ class MotionPollSerializer(ModelSerializer):
 
     def get_yes(self, obj):
         try:
-            result = obj.get_votes().get(value='Yes').weight
-        except obj.get_vote_class().DoesNotExist:
+            result = self.get_votes_dict(obj)['Yes']
+        except KeyError:
             result = None
         return result
 
     def get_no(self, obj):
         try:
-            result = obj.get_votes().get(value='No').weight
-        except obj.get_vote_class().DoesNotExist:
+            result = self.get_votes_dict(obj)['No']
+        except KeyError:
             result = None
         return result
 
     def get_abstain(self, obj):
         try:
-            result = obj.get_votes().get(value='Abstain').weight
-        except obj.get_vote_class().DoesNotExist:
+            result = self.get_votes_dict(obj)['Abstain']
+        except KeyError:
             result = None
         return result
 
+    def get_votes_dict(self, obj):
+        try:
+            votes_dict = self._votes_dict
+        except AttributeError:
+            votes_dict = self._votes_dict = {}
+            for vote in obj.get_votes():
+                votes_dict[vote.value] = vote.weight
+        return votes_dict
+
     def get_has_votes(self, obj):
         """
         Returns True if this poll has some votes.

tests/integration/motions/test_viewset.py

@@ -136,6 +136,24 @@ class CreateMotion(TestCase):
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
 
 
+class RetrieveMotion(TestCase):
+    """
+    Tests retrieving a motion (with poll results).
+    """
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username='admin', password='admin')
+        self.motion = Motion(
+            title='test_title_uj5eeSiedohSh3ohyaaj',
+            text='test_text_ithohchaeThohmae5aug')
+        self.motion.save()
+        self.motion.create_poll()
+
+    def test_number_of_queries(self):
+        with self.assertNumQueries(17):
+            self.client.get(reverse('motion-detail', args=[self.motion.pk]))
+
+
 class UpdateMotion(TestCase):
     """
     Tests updating motions.