Question

我正在尝试使用Fragment帮助程序类优化我的Kohana（3.2.2）应用程序，并且意识到我做错了。

Model_Article：

    public function get_articles()
    {
        /*
         * This is just a PDO wrapper, I don't like the kohana built in
         * database module
         */
        $db = DB::instance();

        $article_stmt = $db->prepare("SELECT * FROM articles");
        $article_stmt->execute();
        return $article_stmt->fetchAll();
    }

Controller_Article：

    public function action_index()
    {
        $this->template->content = View::factory('welcome/index');

        $this->template->content->articles = Model::factory('article')->get_articles();
    }

观点：

        <?php if ( ! Fragment::load('home.articles')): ?>

            <!-- cache test -->

            <?php foreach($articles as $article) echo $article->title . PHP_EOL ?>

            <?php Fragment::save(); ?>
        <?php endif; ?>

您可以看到，无论视图中发生了什么，查询始终都会执行。我希望在缓存更新时执行查询。但是将模型对象传递给视图会打破一些MVC会话吗？有人可以告诉我该怎么做吗？！

Answer 1

缓存处理是控制器应该做的事情，而不是视图。

将它从视图移动到控制器并感到高兴。我没有使用Fragment模块，但我想你会明白主要观点：

public function action_index()
{
    $this->template->content = View::factory('welcome/index');
    if ( ! $articles = Fragment::load('home.articles') )
    {
        // It's better to use separate view for articles list
        $articles = View::factory('articles/list', array('articles' => Model::factory('article')->get_articles());
        // Hope not just an output can be captured but argument can also be passed to the save() method of the module
        Fragment::save($articles);
    }
    $this->template->content->articles = $articles;
}

Answer 2

您必须在视图中进行查询（如果扩展Controller_Template）或在控制器中回显（如果扩展Controller）。

实施例

Controller_Article（扩展控制器）：

public function action_index()
{
    if ( ! Fragment::load('home.articles')):

        $template = View::factory('my_template_view');

        $template->content = View::factory('welcome/index');
        $template->content->articles = Model::factory('article')->get_articles();

        echo $template->render();   // If you won't print anything,
                                    // don't use fragments

        Fragment::save();   // Save the OUTPUT, but DOES NOT save variables
    endif;
}

Controller_article（扩展Controller_Template ）：

public function action_index()
{
    $this->template->content = View::factory('welcome/index');
}

查看（欢迎/索引）：

<?php
    // echo $articles;     // Now Controller is not binding this variable
    if ( ! Fragment::load('home.articles')):

        // Variable - Does NOT save in Fragment
        $articles = Model::factory('article')->get_articles();

        // ECHO = save to Fragment
        foreach($articles as $article) echo $article->title . PHP_EOL;

        Fragment::save();   // Save the OUTPUT, but DOES NOT save variables
    endif;
?>

如果您想保存变量，请使用Kohana Cache。

Kohana片段缓存和数据库的结果

2 个答案: