Laravel Eloquent Relationships Through Macros

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Laravel Eloquent Relationships Through Macros image

A new feature just merged into Laravel and included in the v5.4.8 update is the ability to define Macros for Eloquent Relationships. To better show how this feature works here is a screenshot by Jordan Pittman who created the original pull request:

Here is that same example in a copy and paste friendly version.

AppServiceProvider

use Illuminate\Database\Eloquent\Relations\HasOne;
 
//...
 
public function boot()
{
HasMany::macro('toHasOne', function() {
return new HasOne(
$this->query,
$this->parent,
$this->foreignKey,
$this->localKey
);
});
}

User Model

public function logins()
{
return $this->hasMany(Login::class);
}
 
public function lastLogin()
{
return $this->logins()->latest()->toHasOne();
}

Results

$user = App\User::find(1);
$user->logins()->first()->id; // 1
$user->logins()->count(); // 2
$logins = $user->lastLogin->id; // 2

Of course, this is just one example, and it should allow for some unique use cases in your applications.

Eric L. Barnes photo

Eric is the creator of Laravel News and has been covering Laravel since 2012.

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