Use context option (if provided) as the context_value for the execution of the query.

Author: luisincrespo

flask_graphql/graphqlview.py

@@ -47,7 +47,7 @@ def get_root_value(self, request):
         return self.root_value
 
     def get_context(self, request):
-        return request
+        return self.context or request
 
     def get_middleware(self, request):
         return self.middleware