non succeeeded in ajax test

rowers/views.py

@@ -38,6 +38,7 @@ from django.views.generic.edit import UpdateView,DeleteView
 
 from django.http import (
     HttpResponse, HttpResponseRedirect,
+    JsonResponse,
     HttpResponseForbidden, HttpResponseNotAllowed,
     HttpResponseNotFound,Http404
     )
@@ -227,6 +228,7 @@ class JSONResponse(HttpResponse):
         kwargs['content_type'] = 'application/json'
         super(JSONResponse, self).__init__(content, **kwargs)
 
+        
 def getrequestrower(request,rowerid=0,userid=0,notpermanent=False):
 
     userid = int(userid)
@@ -12038,7 +12040,10 @@ def workout_toggle_ranking(request,id=0):
     row.save()
 
     if is_ajax:
-        return JSONResponse({'result':row.rankingpiece})
+        response = JSONResponse({'result':row.rankingpiece},
+                                content_type='application/json')
+
+        return response
     else: 
         url = reverse(workouts_view)
         response = HttpResponseRedirect(url)