Introducing 9 useful Laravel Eloquent features-Laravel-php.cn

The following is the tutorial column of laravel to introduce and share nine useful features of Laravel Eloquent. I hope it will be helpful to friends in need!

For developers who use Laravel, they may be amazed Although the Eloquent Model is powerful, there are still many little-known features under the powerful surface. This article will share ten powerful features of Laravel Eloquent.

1. More powerful find() method
When many developers use the find() method, they usually just pass in a In fact, we can also pass in the second parameter of the ID parameter: Specify the field to be found in the find() method

$user = App\User::find(1, ['name', 'age']);
$user = App\User::findOrFail(1, ['name', 'age']);
// 这里面的 name 和 age 字段就是制定只查找这两个字段

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2 .Clone Model
Just use the replicate() method, so we can easily create a copy of the Model:

$user = App\User::find(1);
$newUser = $user->replicate();
$newUser->save();
// 这样，$newUser 和 $user 的基本数据就是一样的

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3. Check the Model Whether they are the same
Use the is() method to check whether the IDs of the two Models are consistent and whether they are in the same table:

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

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4. In the associated model Save data at the same time
Usepush() You can save the associated data while saving the model data:

class User extends Model
{
    public function phone()
    {
        return $this->hasOne('App\Phone');
    }
}
$user = User::first();
$user->name = "GeiXue";
$user->phone->number = '1234567890';
$user->push(); 
// 最后这一行 push() 会将 user 的数据和 phone 的数据同时更新到数据库中

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5. Custom deleted_at field
If you have used Laravel's Soft Delete, you should know that Laravel actually uses the deleted_at field to mark a record as deleted. Maintenance, in fact, you can customize this field:

class User extends Model
{
    use SoftDeletes;
     * The name of the "deleted at" column.
     *
     * @var string
     */
    const DELETED_AT = 'deleted_date';
}

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Or you can customize it like this:

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

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6. Get the modified Model attributes
Use the getChanges() method to get the modified attributes:

$user->getChanges()
//[
     "name" => "GeiXue",
  ]

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7. Check whether the Model has been modified
Use isDirty() Method can detect whether the data in the model has been modified:

$user = App\User::first();
$user->isDirty();          //false
$user->name = "GeiXue";
$user->isDirty();          //true

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When using isDirty(), you can also directly detect whether a certain attribute has been modified:

$user->isDirty('name');    //true
$user->isDirty('age');     //false

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8. Get the original data of the Model
When assigning new values to the properties of the Model, you can get the original value through getOriginal():

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

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9. Refresh the Model data
Use refresh() to refresh the Model data, this is when you use tinker Particularly useful:

$user = App\User::first();
$user->name;               // JellyBool
// 这个时候在其他地方，该用户的名字被更新为 GeiXue，你可以使用 refresh 来刷新，而不用退出 tinker
$user->refresh(); 
$user->name;              // GeiXue

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Finally
The above nine Eloquent features are actually very useful in specific application scenarios. I hope they can help you when you develop a Laravel project. Click.

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