通过 populateState 方法对 joomla 中的列进行排序

Question

我正在 Joomla 后端对表格列进行排序。我根据本教程调整设置。

正如我们所见，建议覆盖populateState方法并手动获取排序选项。

public function populateState() {
    $filter_order = JRequest::getCmd('filter_order');
    $filter_order_Dir = JRequest::getCmd('filter_order_Dir');

    $this->setState('filter_order', $filter_order);
    $this->setState('filter_order_Dir', $filter_order_Dir);
}

但是我注意到本机组件com_content没有在模型文件中明确设置这些选项administrator/components/com_content/models/articles.php。

protected function populateState($ordering = null, $direction = null)
{
    // Initialise variables.
    $app = JFactory::getApplication();
    $session = JFactory::getSession();

............................................
............................................
............................................

    // List state information.
    parent::populateState('a.title', 'asc');
} 

相反，它只是调用 parent populateState。事实上JModelList::populateState()包括这个：

protected function populateState($ordering = null, $direction = null)
{
    // If the context is set, assume that stateful lists are used.
    if ($this->context) {
        $app = JFactory::getApplication();

.....................................
.....................................
.....................................

        $value = $app->getUserStateFromRequest($this->context.'.ordercol', 'filter_order', $ordering);
        if (!in_array($value, $this->filter_fields)) {
            $value = $ordering;
            $app->setUserState($this->context.'.ordercol', $value);
        }
        $this->setState('list.ordering', $value);

        // Check if the ordering direction is valid, otherwise use the incoming value.
        $value = $app->getUserStateFromRequest($this->context.'.orderdirn', 'filter_order_Dir', $direction);
        if (!in_array(strtoupper($value), array('ASC', 'DESC', ''))) {
            $value = $direction;
            $app->setUserState($this->context.'.orderdirn', $value);
        }
        $this->setState('list.direction', $value);
    }
    else {
        $this->setState('list.start', 0);
        $this->state->set('list.limit', 0);
    }
}

所以我试图模仿原生的代码com_content。因此我假设

class CompViewData extends JView
{

function display($tpl = null)
{
    $this->state = $this->get('State');

将调用 parent JModelList::populateState()（所以我不会在模态类中覆盖它）并设置$this->setState('list.ordering', $value);. 但是由于某种原因，当我调用$this->state->get()ingetListQuery()来构建我的 SQL 查询时

protected function getListQuery()
{

    $orderCol   = $this->state->get('list.ordering', 'id');
    $orderDirn  = $this->state->get('list.direction', 'asc');

这个变量碰巧没有定义。

我错过了什么？我认为它以某种方式与正确的用户会话有关，但我没有任何证据。

Answer 1

在遇到同样的问题后，我发现，正如您所说，超类 populateState() 确实定义了行为。但是，它还会进行检查以确保您的字段位于“白名单”中。

if (!in_array($value, $this->filter_fields))

如果您查看 com_content，您将在模型类的顶部看到此部分（在您的情况下为 models/articles.php）：

public function __construct($config = array())
{
    if (empty($config['filter_fields']))
    {
        $config['filter_fields'] = array(
            'id', 'a.id',
            'title', 'a.title',
             //...(more fields here)
            'publish_up', 'a.publish_up',
            'publish_down', 'a.publish_down',
        );

        $app = JFactory::getApplication();
        $assoc = isset($app->item_associations) ? $app->item_associations : 0;
        if ($assoc)
        {
            $config['filter_fields'][] = 'association';
        }
    }

    parent::__construct($config);
}

您需要包含此部分，以便 ModelList 类知道“ordering”字段位于白名单中。显然，将这​​些字段替换为您想要过滤的字段。