使用特征时返回null值,但类中的var_dump返回正确的数据

Question

好的,坚持我在这里.我有一个我需要遵循的过程,并且有很多if语句我已经分解成较小的类而不是一个丑陋的开关或if/else语句.基本上,我调用类的handle方法,它确定我们在进程中的位置,实例化适当的类,然后构建所需的集合并返回它.

我有一个模型,我试图获得该nextAction特定记录.在nextAction将有一个名称,日期,timeRemaining和路由键返回集合.这是我的FreeLook.php模型中的方法:

public function nextAction()
{
    // handle basically just calls a handle method on the NextActionHandler class.
    return handle(new NextActionHandler($this));
}

该NextActionHandler课程列出了我们在这个过程中的位置.它通过使用我创建的特征来实现Actionable.这是NextActionHandler班级:

class NextActionHandler
{
    use Actionable;

    protected $freeLook;

    public function __construct($freeLook)
    {
        $this->freeLook = $freeLook;
    }


    public function handle()
    {
        switch (true) {
            case $this->wantsSign() && !$this->signJobIsComplete():
                return handle(new SignNextAction($this->freeLook));
            case $this->wantsPaint() && !$this->paintJobIsComplete():
                return handle(new PaintNextAction($this->freeLook));
            case $this->needsToSubmitCoOp():
                return handle(new CoOpNextAction($this->freeLook));
            default:
                return handle(new DefaultNextAction($this->freeLook));
        }
    }
}

这是一些Actionable特质.我不会把所有这些都放在这里,因为它真的很长.我包含了很多逻辑,以便弄清楚我们在这个过程中的位置.需要注意的一点是,它确实包含构建我返回的集合输出的逻辑.(如果你想要完整的Actionable代码,请到这里)

    protected function needToChooseVendor()
    {
        $this->name = 'Choose Vendor';
        $this->duration = $this->freeLook->status->expected_duration;
        $this->calculateTimeRemaining();

        return $this->buildOutput();
    }

    protected function calculateTimeRemaining()
    {
        if ($this->duration) {
            $this->timeRemaining = Carbon::now()->diffInDays($this->date);
        }
    }

    protected function buildOutput()
    {
        return collect([
            'name' => $this->name,
            'date' => $this->date,
            'timeRemaining' => $this->timeRemaining,
            'route' => $this->route,
        ]);
    }

最后,我的DefaultNextAction类,它也使用特征来构造输出并返回它.

class DefaultNextAction
{

    use Actionable;

    public function __construct($freeLook)
    {
        $this->freeLook = $freeLook;
        $this->date = $freeLook->next_action_at;
    }

    public function handle()
    {
        return $this->returnDefaultNextAction();
    }

    protected function returnDefaultNextAction()
    {
        $this->name = $this->freeLook->status->name;
        $this->duration = $this->freeLook->status->expected_duration;
        $this->calculateTimeRemaining();
        $this->output = $this->buildOutput();

        return $this->output;
    }
}

所以,当我在returnDefaultNextAction方法中进行转储和死亡时,我得到了预期的结果.但是,当我在我的模型中倾倒和死亡时,我总是得到null.这是什么原因？由于我使用特征并且特征无法实例化,我认为我正在处理对象的相同实例并且所有应该都可以工作.

任何想法都会非常有用!

编辑1 这是handle我用来包裹所有对象的方法.

if (!function_exists('handle')) {
    function handle($object)
    {
        if (!is_object($object)) {
            throw new Exception('An object must be passed to the handle method. This is not what happened.');
        }

        call_user_func([$object, 'handle']);
    }
}

编辑2 即使我在我的模型中调用我的句柄方法,我得到相同的null结果:

 public function nextAction()
 {
    $nextAction = new NextActionHandler($this);

    return $nextAction->handle();
 }

Answer 1

您的handle函数没有返回任何内容。需要是

if (!function_exists('handle')) {
    function handle($object)
    {
        if (!is_object($object)) {
            throw new Exception('An object must be passed to the handle method. This is not what happened.');
        }

        return call_user_func([$object, 'handle']);
    }
}