户厕管理，工作人员分配观察者

模型对应的观察者OrderAllocationObserver
public function created(TmOrderManagement $tmOrderManagement)
{

    $userid= $tmOrderManagement->userid;
    $townname= TmToilet::where('id',$userid)->value('town');
    $townid=TmTown::where('townname',$townname)->value('id');

    if(DB::table('tm_zone_management')->where('townid',$townid)
        ->where('allocation_status',0)->first()==null)
    {
        DB::table('tm_zone_management')->where('townid',$townid)
            ->update(['allocation_status'=>0]);
    }   //如果区域内的所以可分配员工都被分配，重置分配状态

    $tmOrderManagement->workid=DB::table('tm_zone_management')->where('townid',$townid)
        ->where('allocation_status',0)->first()->workerid;
    DB::table('tm_zone_management')->where('workerid',$tmOrderManagement->workid)->update(['allocation_status'=>1]);
    //获取工作人员id赋值给工单，然后把区域表里对应工作人员的分配状态置为1

    $tmOrderManagement->save();
    //
}