Illuminate\Database\Eloquent\Builder::macro PHP Méthode

    public function macro($name, Closure $callback)
    {
        $this->macros[$name] = $callback;
    }

 public function newEloquentBuilder($query)
 {
     $builder = new Builder($query);
     $builder->macro('key', function (Builder $builder) {
         return $builder->getQuery()->key();
     });
     $builder->macro('flush', function (Builder $builder) {
         return $builder->getQuery()->flush();
     });
     return $builder;
 }