unique candidates in assignments if there are more then one ballot

openslides/assignment/models.py

@@ -72,10 +72,18 @@ class Assignment(models.Model):
         # list of candidates
         from poll.models import Option
         candidates = []
-        #for option in Option.objects.values('user__user__profile').filter(poll__assignment=self).order_by('user__user__first_name').distinct():
+
+        def unique(candidates):
+            newcandidates = []
+            for candidate in candidates:
+                if not candidate in newcandidates:
+                    newcandidates.append(candidate)
+            return newcandidates
+
+
         for option in Option.objects.filter(poll__assignment=self).order_by('user__user__first_name'):
             candidates.append(option.value)
-        return candidates
+        return unique(candidates)
 
     def set_elected(self, profile, value=True):
         if profile in self.candidates: