我正在尝试在 Kohana 中构建一个表单向导，并且我正在学习一些东西。我学到的可能最有效的一件事是在我的类结构中使用状态模式来管理用户在表单过程中可能处于的不同步骤。

在做了一些研究之后，我一直认为最好的方法可能是使用一个接口(interface)，并让所有步骤都充当实现该接口(interface)的状态。状态验证后，它会更改一个 session 变量到下一步，可以在界面初始加载时读取，并调用正确的状态来使用。

这种方法有意义吗？如果是这样，我到底该如何实现(我如何最好地构建文件系统？)

这是我一直在做的粗略的开始:

<?php defined('SYSPATH') or die('No direct script access.');

/**
* Project_Builder @state
* Step_One @state
* Step_Two @state
**/

interface Project_Builder 
{
    public function do_this_first();
    public function validate();
    public function do_this_after();
}

class Step_One implements Project_Builder {

    public function __construct
    {
        parent::__construct();

        // Do validation and set a partial variable if valid

    }

    public function do_this_first() 
    {
        echo 'First thing done';
        // This should be used to set the session step variable, validate and add project data, and return the new view body.
            $session->set('step', '2');


    }
    public function do_this_after()
    {
        throw new LogicException('Have to do the other thing first!');
    }

}

class Step_Two implements Project_Builder {
    public function do_this_first()
    {
        throw new LogicException('Already did this first!');
    }
    public function do_this_after()
    {
        echo 'Did this after the first!';
        return $this;
    }
}

class Project implements Project_Builder {
    protected $state;
    protected $user_step;
    protected $project_data

    public function __construct()
    {
        // Check the SESSION for a "step" entry. If it does not find one, it creates it, and sets it to "1".
        $session = Session::instance('database');

        if ( ! $session->get('step'))
        {
            $session->set('step', '1');
        }

        // Get the step that was requested by the client.
        $this->user_step = $this->request->param('param1');

        // Validate that the step is authorized by the session.
        if ($session->get('step') !== $this->user_step)
        {
            throw new HTTP_Exception_404('You cannot skip a step!');
        }

        // Check if there is user data posted, and if so, clean it.
        if (HTTP_Request::POST == $this->request->method())
        {
            foreach ($this->request->post() as $name => $value)
            {
                $this->project_data["$name"] = HTML::chars($value);
            }
        }   

        // Trigger the proper state to use based on the authorized session step (should I do this?)
        $this->state = new Step_One;
    }
    public function doThisFirst()
    {
        $this->state = $this->state->do_this_first();
    }
    public function doThisAfter()
    {
        $this->state = $this->state->do_this_after();
    }
}

$project = new Project;
try
{
    $project->do_this_after(); //throws exception
}
catch(LogicException $e)
{
    echo $e->getMessage();
}

$project = new Project;
$project->do_this_first();
$project->validate();
$project->do_this_after();
//$project->update();

最佳答案

您的方法看起来确实可行，但我很想让它更简单，并使用一些 Kohanas 内置功能来满足您的需求。例如，我会使用 Kostache( mustache )并为每个步骤设置单独的 View 类(可能还有模板)。然后 Controller 变得非常简单。请参阅下面的示例(缺少 session 内容和 step_number 的验证)。所有验证都在模型中处理。如果存在验证错误，则会抛出异常，然后将错误消息传递回 View 。

<?php

class Wizard_Controller {

    function action_step($step_number = 1)
    {
        $view = new View_Step('step_' + $step_number);

        if ($_POST)
        {
            try
            {
                $model = new Model_Steps;
                $model->step_number = $step_number;
                if ($model->save($_POST))
                {
                    // Go to the next step
                    $step_number++;
                    Request::current()->redirect('wizard/step/'.$step_number);    
                }
            }
            catch (Some_Kind_Of_Exception $e)
            {
                $view->post = $_POST;
                $view->errors = $e->errors();
            }
        }

        $view->render();
    }
}
?>

希望这是有道理的。

关于php - 在 Kohana 3.1.3 中使用接口(interface)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6164719/