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Laravel Eloquent Relationships Through Macros

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[开发(php) 所属分类 开发(php) | 发布者 店小二03 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

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 :


Laravel Eloquent Relationships Through Macros

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.

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