private void AddRuntimeModelDirectives(FieldDef fldDef)
        {
            var allReqDirs = _requestContext.ParsedRequest.AllDirectives;

            if (fldDef.HasDirectives())
            {
                foreach (Model.ModelDirective fldDir in fldDef.Directives)
                {
                    allReqDirs.Add(new RuntimeDirective(fldDir, allReqDirs.Count));
                }
            }
            var typeDef = fldDef.TypeRef.TypeDef;

            if (typeDef.HasDirectives())
            {
                foreach (Model.ModelDirective tdir in typeDef.Directives)
                {
                    allReqDirs.Add(new RuntimeDirective(tdir, allReqDirs.Count));
                }
            }
        }