无法在Datatables beego，beego datatables（https://github.com/beego-datatables/datatables）中获取数据

I can't get data in datatables... but I can get a record

I'm using beego and PostgreSQL.

This is the controller

func (c *UploadController) AjaxData(){

var Qtab datatables.Data
Qtab.Ctx = c.Input()//datatables get
Qtab.DBName = "upload"
Qtab.TableName = "uploads" //modles tables name
Qtab.Columns = []string{"Id","AppId","ProspectId","DocType","Path"} //datatables columns arrange
Qtab.Order = []string{"","AppId","ProspectId","DocType","Path"}
Qtab.SearchFilter = []string{"DocType","Path"} //datatables filter
datatables.RegisterColumns[Qtab.TableName] = new([]models.User) //register result

rs , _ := Qtab.Table()


c.Data["json"] = rs

c.ServeJSON()



//
{
  "data": [],
  "draw": 0,
  "recordsFiltered": 6,
  "recordsTotal": 6
}