Laravel5.4模型属性详解

首先以App\User模型为例
1、$table属性
表名，对应数据库中的表名
2、 fillable（ guarded）属性
fillable和 guarded属性都是laravel的批量赋值方法create()的， fillable表示在create()方法中可以被赋值的字段，对应的是 guarded表示在create()方法中不能被赋值的字段
3、$hidden属性
$hidden属性可以隐藏字段，使其不出现在数组或者json格式中。

       $user = Auth::user();
       dump($user);exit;

输出结果为：
#attributes: array:13 [▼
"id" => 1
"name" => "admin"
"email" => ""
"description" => "超级管理员"
"password" => "$2y$10$ib2n.ZbZFvZdt7S8N.9tKuON8QzedokbHOyxMX/7m9Iz66YBCHqyy"
"remember_token" => "fTldAutDKCRGRpKvwVtYyDsdi79A1loGlwJBBgHGJSK6ih26pFdo5qvfN8VG"
"status" => "NORMAL"
"assigned_rate" => 0
"supplier_id" => 0
"agency_id" => 12
"deleted_at" => null
"created_at" => "2015-11-02 05:13:17"
"updated_at" => "2017-03-24 09:35:05"
转换数组：

      $user = Auth::user()->toArray();
      dump($user);exit;

结果为：

array:11 [▼
  "id" => 1
  "name" => "admin"
  "email" => ""
  "description" => "超级管理员"
  "status" => "NORMAL"
  "assigned_rate" => 0
  "supplier_id" => 0
  "agency_id" => 12
  "deleted_at" => null
  "created_at" => "2015-11-02 05:13:17"
  "updated_at" => "2017-03-24 09:35:05"
]

转换成JSON格式：

       $user = Auth::user()->toJson();
       dump($user);exit;

输出结果为：

"{"id":1,"name":"admin","email":"[email protected]","description":"\u8d85\u7ea7\u7ba1\u7406\u5458","status":"NORMAL","assigned_rate":0,"supplier_id":0,"agency_id":12,"deleted_at":null,"created_at":"2015-11-02 05:13:17","updated_at":"2017-03-24 09:35:05"}"

可见hidden属性的作用

4、$dates属性
$dates属性里面包含的字段可以直接后面跟carbon类时间操作的任何方法，例如一个模型：

class User extends Model{
    /**
     * 应该被调整为日期的属性
     *
     * @var array
     */
    protected $dates = ['created_at', 'updated_at', 'disabled_at'];
}

$user = App\User::find(1);
return $user->disabled_at->getTimestamp();

5、$attributes属性
默认给数据库里的一个字段赋值

  protected $attributes = [
    'user_limit' => 100,
  ];

默认给这个模型表的user_limit字段赋上100的值
6、$timestamps属性
laravel默认会在create()创建数据的时候，将created_at字段更新，如果是进行修改操作，将会更新updated_at属性里面的值
如果将

public $timestamps = false;

则create方法执行时，不会修改对应的值