@Override
 protected void prepareModel() throws Exception {
   if (id != null) {
     workGroup = workGroupManager.getWorkGroup(id);
   } else {
     workGroup = new Workgroup();
   }
 }
 @Override
 @Action("work-group-delete")
 public String delete() throws Exception {
   String logSign = ""; // 该字段只是为了标识日志信息:工作组名称
   String[] str = ides.split(",");
   for (String sid : str) {
     workGroup = workGroupManager.getWorkGroup(Long.valueOf(sid));
     workGroupManager.cleanWorkGroup(workGroup.getId());
     if (StringUtils.isNotEmpty(logSign)) {
       logSign += ",";
     }
     logSign += workGroup.getName();
     workGroupManager.deleteWorkGroup(Long.valueOf(sid));
   }
   ApiFactory.getBussinessLogService()
       .log("工作组管理", "删除工作组:" + logSign, ContextUtils.getSystemId("acs"));
   this.renderText("ok");
   return null;
 }