fix 500, use django orm

highscore/views.py

 from django.shortcuts import render
 from django.db.models import F, Max, ExpressionWrapper, FloatField
-from django.db.models.query import RawQuerySet
 from core.models import SnakeGame
-from django.db.models.expressions import RawSQL
+from django.db import models
 
 def sattr(obj, attr, val):
     if isinstance(obj, dict):
@@ -19,9 +18,8 @@ def gattr(obj, attr):
 
 def table(request, data, usr, title, rotate):
     i = 0
-    
     for d in data:
-        sattr(d, 'position', '{}.'.format(i+1)) 
+        sattr(d, 'position', '{}.'.format(i+1))
         if request.user.is_authenticated and gattr(d, 'user__username') == request.user.username:
             sattr(usr, 'position', gattr(d, 'position'))
         i = i + 1
@@ -54,42 +52,15 @@ def maxage(request):
     return table(request, data, usr, 'Max Age', 'highscore_consumerate')
 
 def consumerate(request):
-    data = SnakeGame.objects.raw(
-        '''SELECT 1 as "id", "auth_user"."username" as "user__username", 
-            max(
-                (natural_food_consumed + carrison_food_consumed + hunted_food_consumed)
-                /
-                (end_frame - start_frame)
-               ) AS "score" 
-           FROM "core_snakegame" LEFT OUTER JOIN "auth_user" 
-           ON ("core_snakegame"."user_id" = "auth_user"."id")
-           GROUP BY "auth_user"."username" 
-           ORDER BY 
-                (natural_food_consumed + carrison_food_consumed + hunted_food_consumed)
-                /
-                (end_frame - start_frame) DESC
-        ''')
+    data = SnakeGame.objects.values('user__username').annotate(
+        score=Max(ExpressionWrapper(
+            (F('natural_food_consumed') + F('carrison_food_consumed') + F('hunted_food_consumed'))
+            / (F('end_frame') - F('start_frame')), output_field=models.FloatField())
+        )
+    ).order_by('-score')
 
-    ndata = []
-    for d in data:
-        ndata.append({'user__username': d.user__username, 'score': d.score})
-    data = ndata
-    
     if request.user.is_authenticated:
-        usr = SnakeGame.objects.raw(
-            '''
-            SELECT 1 as "id", 
-            max(
-                (natural_food_consumed + carrison_food_consumed + hunted_food_consumed)
-                /
-                (end_frame - start_frame)
-               ) AS "score" 
-           FROM "core_snakegame" LEFT OUTER JOIN "auth_user" 
-           ON ("core_snakegame"."user_id" = "auth_user"."id")
-           WHERE "auth_user"."id" = %s
-           GROUP BY "auth_user"."id"
-            ''', [request.user.id]
-        )[0]
+        usr = data.filter(user__username=request.user.username)[0]
     else:
         usr = False
     return table(request, data, usr, 'Consume Rate', 'highscore')