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在 Laravel 5.4 中，我注册了一个服务提供者，它为我的 Context 类创建了一个单例，该类包含应用程序上下文。

上下文服务提供者 

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App;

class ContextServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
        // Set-up application context
        $context = app('context');
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->singleton('context', function ($app) {
            return new App\Context();
        });

    }
}

然后我创建了一个具有全局范围的 Eloquent 模型。

模型媒体

namespace App\Models;

use App\Scopes\SchoolScope;
use Illuminate\Database\Eloquent\Model;

class Media extends Model
{    
    public static function boot()
    {
        parent::boot();

        static::addGlobalScope(new SchoolScope());
    }    
}

现在，当我在 SchoolScope 范围内访问 Context 单例时，会创建两次单例！

学校范围

namespace App\Scopes;

use Illuminate\Database\Eloquent\Scope;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;

use App\Models\School;

class SchoolScope implements Scope
{
    protected $school;

    public function __construct()
    {        
        $this->school = app('context')->school;
    }

    public function apply(Builder $builder, Model $model)
    {        
        $builder->where('school_id', '=', $this->school->id);
    }
}

有谁知道为什么单例会被创建两次？

4

0 回答 0