public string ExtendNode(string queryStr)
{
ImportService impSrv = new ImportService();
var query = impSrv.GetAssociateRecord(queryStr);
var chartData = impSrv.RecordToChartData(query);
impSrv.CorrectChartData(chartData);
var jsonStr = JsonConvert.SerializeObject(chartData);
return(jsonStr);
}