implement children get api

@@ -148,6 +148,36 @@ class ItemViewSet(viewsets.ViewSet):
             # action is not set return default permission_classes
             return [permission() for permission in self.permission_classes]
 
+    # url: items/{key}/children/
+    @action(methods=['GET', 'POST'], detail=True, permission_classes=[AllowAny],
+            url_path='children', url_name='children')
+    def children(self, request, pk):
+        if request.method == 'GET':
+            children = Item.objects.filter(parent = pk)
+            children_data = serializers.serialize("json", children)
+            json_children = json.loads(children_data)
+            parent = Item.objects.filter(item_id=pk) #item
+            parent_data = serializers.serialize("json", parent)
+            json_parent = json.loads(parent_data)[0]['fields']
+            res = json_parent
+            res['id'] = pk
+            children_list = []
+            for i in json_children:
+                t = i['fields']
+                t['id'] = i['pk']
+                children_list.append(t)
+            res['list'] = children_list
+            return Response({'data': res}, status=status.HTTP_200_OK)
+        if request.method == 'POST':
+            print("post")
+            #
+            # data = JSONParser().parse(request)
+            # serializer = ItemSerializer(data=data)
+            # if serializer.is_valid():
+            #     serializer.save()
+            #     return Response(serializer.data)
+            return Response({'message': 'post is not existed.'}, status=status.HTTP_204_NO_CONTENT)
+
 
 class SharedItemViewSet(viewsets.ModelViewSet):
 

@@ -33,5 +33,6 @@ urlpatterns = [
     url(r'^<int:pk>/share/$', views.SharedItemViewSet.share, name='share'),
     url(r'^<int:pk>/move/$', views.ItemViewSet.move, name='move'),
     url(r'^<int:pk>/copy/$', views.ItemViewSet.copy, name='copy'),
+    url(r'^<int:pk>/children/$', views.ItemViewSet.children, name='copy'),
 
 ]