1. 在find方法中指定属性

User::find(1, ['name', 'email']);User::findOrFail(1, ['name', 'email']);

2. Clone一个Model

用replicate方法可以克隆一个Model

$user = User::find(1);$newUser = $user->replicate();$newUser->save();

3. 判断两个Model是否相同

检查两个Model的ID是否相同用is方法

$user = User::find(1);$sameUser = User::find(1);$diffUser = User::find(2);$user->is($sameUser); // true$user->is($diffUser); // false;

4. 重新加载一个Model

$user = User::find(1);$user->name;    // 'Peter'// 如果 name 更新过，比如由 peter 更新为 John$user->refresh();$user->name;  // John

5. 加载新的Model

$user = App\User::first();$user->name;               // John//$updatedUser = $user->fresh(); $updatedUser->name;       // Peter$user->name;              // John

6. 更新带关联的Model

在更新关联的时候，使用push方法可以更新所有Model

class User extends Model{    public function phone()    {        return $this->hasOne('App\Phone');    }}$user = User::first();$user->name = "Peter";$user->phone->number = '1234567890';$user->save(); // 只更新 User Model$user->push(); // 更新 User 和 Phone Model

7. 自定义软删除字段

Laravel默认使用deleted_at作为软删除字段，我们通过以下方式将deleted_at改成is_deleted

class User extends Model{    use SoftDeletes;     * deleted_at 字段.     *     * @var string     */    const DELETED_AT = 'is_deleted';}

或者使用访问器

class User extends Model{    use SoftDeletes;        public function getDeletedAtColumn(){        return 'is_deleted';    }}

8. 查询Model更改的属性

$user = User::first();$user->name; // John$user->name = 'Peter';$user->save();dd($user->getChanges());// 输出：[    'name' => 'John',    'updated_at' => '...']

9. 查询Model是否已更改

$user = User::first();$user->name;             // John$user->isDirty();        // false $user->name = 'Peter';   $user->isDirty();        // true$user->getDirty();       // ['name' => 'Peter']$user->save();           $user->isDirty();        // false

getChanges()与getDirty()的区别
getChanges()方法用在 save()方法之后输出结果集
getDirty()方法用在save()方法之前输出结果集

10. 查询修改前的Model信息

$user = App\User::first();$user->name;                   //John$user->name = "Peter";         //Peter$user->getOriginal('name');    //John$user->getOriginal();          //Original $user record