laravelORM只开启created_at的几种方法总结

class user extends model {
  public $timestamps = false;//关闭自动维护
  public static function boot() {
    parent::boot();
    #只添加created_at不添加updated_at
    static::creating(function ($model) {
      $model->created_at = $model->freshtimestamp();
      //$model->updated_at = $model->freshtimestamp();
    });
  }
}

此处有坑:使用create方法创建一条记录时返回值的created的值是这样的： 
“created_at”: { 
“date”: “2017-09-27 13:47:12.000000”, 
“timezone_type”: 3, 
“timezone”: “asia/shanghai” 
}, 
并不是想象中的 
“created_at”: “2017-09-27 13:49:39”, 

class user extends model {
  const updated_at = null;//设置update_at为null
  //const created_at = null;
}

此处有坑:使用destroy删除会报错 
missing argument 2 for illuminatedatabaseeloquentmodel::setattribute() 
使用delete不影响,wherein也不影响

class user extends model {
  //重写setupdatedat方法
  public function setupdatedat($value) {
    // do nothing.
  }
  //public function setcreatedat($value)
  //{
    // do nothing.
  //}
}

class user extends model {
  //重写setupdatedat方法
  public function setupdatedatattribute($value) {
    // do nothing.
  }
  //public function setcreatedatattribute($value)
  //{
    // do nothing.
  //}
}

class createpoststable extends migration {
  public function up() {
   schema::create('posts', function(blueprint $table) {
   $table->timestamp('created_at')
   ->default(db::raw('current_timestamp'));
  });
}