context is now a private method in GrahqlController

It will be easier to override

api/app/controllers/refinery/admin/graphql_controller.rb

@@ -6,10 +6,6 @@ def execute
         query = params[:query]
         variables = params[:variables] || {}
 
-        context = {
-          current_user: current_refinery_user
-        }
-
         begin
           result = Refinery::Api::GraphqlSchema.execute(query, variables: variables, context: context)
         rescue => error
@@ -18,6 +14,14 @@ def execute
 
         render json: result
       end
+
+      private
+
+      def context
+        {
+          current_user: current_refinery_user
+        }
+      end
     end
   end
 end