如何解决状态管理复杂性问题？使用Winzou/State-Machine-Bundle可以！

<code>composer require winzou/state-machine-bundle</code>

<code>// app/AppKernel.php
public function registerBundles()
{
    return array(
        // ...
        new winzou\Bundle\StateMachineBundle\winzouStateMachineBundle(),
    );
}</code>

<code># app/config/config.yml

winzou_state_machine:
    my_bundle_article:
        class: My\Bundle\Entity\Article
        property_path: state
        graph: simple
        states:
            - new
            - pending_review
            - awaiting_changes
            - accepted
            - published
            - rejected
        transitions:
            create:
                from: [new]
                to: pending_review
            ask_for_changes:
                from: [pending_review, accepted]
                to: awaiting_changes
            submit_changes:
                from: [awaiting_changes]
                to: pending_review
            approve:
                from: [pending_review, rejected]
                to: accepted
            publish:
                from: [accepted]
                to: published
        callbacks:
            guard:
                guard_on_submitting:
                    on:   'submit_changes'
                    do:   ['@my.awesome.service', 'isSubmittable']
                    args: ['object']
            before:
                update_reviewer:
                    on:   'create'
                    do:   ['@my.awesome.service', 'update']
                    args: ['object']
            after:
                email_on_publish:
                    on:   'publish'
                    do:   ['@my.awesome.service', 'sendEmail']
                    args: ['object', '"Email title"']</code>

<code>public function myAwesomeAction($id, \SM\Factory\Factory $factory)
{
    $article = $this->getRepository('MyAwesomeBundle:Article')->find($id);
    $articleSM = $factory->get($article, 'simple');
}</code>

<code>// 检查是否可以应用转换
$articleSM->can('a_transition_name');

// 应用转换
$articleSM->apply('a_transition_name');

// 获取当前状态
$articleSM->getState();

// 获取所有可能的转换
$articleSM->getPossibleTransitions();</code>