示例hook_pathauto_pattern_alter

Question

我不明白钩子的意思。我希望，"pattern_alter“将允许我”改变“”模式“。但情况似乎并非如此。

我也试图改变化名..。这似乎也没有效果。

能给我举个例子吗？

function xxx_pathauto_pattern_alter(\Drupal\pathauto\PathautoPatternInterface &$pattern, array $context) {

  /* //////////////////////////////////////////////////////////////////////////////////
  ////    article_type - override path logic for *archived* nodes ('/archiv/[node::title]')
  /* ///////////////////////////////////////////////////////////////////////////////////*/
  if( $context['op'] === "update" && $context['bundle'] === "news") {

    $node = $context['data']['node'];
    $archived = $node->get('field_archived')->getString() === "1";
    if ($archived) {

      $pattern->setPattern('/archive/[node::title]');
      dpm($pattern); //WORKS !!! in object only. Pattern will not change in real world.
    }
  }
}

function xxx_pathauto_alias_alter(&$alias, array &$context) {
  /* //////////////////////////////////////////////////////////////////////////////////
    ////    article_type - override path logic for *archived* nodes ('/archive/[node::title]')
    /* ///////////////////////////////////////////////////////////////////////////////////*/
  if ($context['op'] === "update" && $context['bundle'] === "news") {

    $node = $context['data']['node'];
    $archived = $node->get('field_archived')->getString() === "1";
    if ($archived) {
      $alias = "/archive/nope";
      dpm($alias); //WORKS !!! in function only. Alias will not change in real world.
    }
  }

Answer 1

只有在以下情况下才会调用hook_pathauto_pattern_alter()：

• 该实体具有路径字段。
• 已启用路径自动处理。
• 对于支持修订的实体，该实体使用默认修订。
• 已为该实体设置了默认模式。
• $entity->toUrl()->getInternalPath()不引发EntityMalformedException、UndefinedLinkTemplateException或UnexpectedValueException异常

只在更新实体时才调用显示的钩子，而不是在创建实体时调用。当路径自动模块被设置为不更改现有路径别名时，即使调用了hook_pathauto_pattern_alter()，路径别名也不会更改。

另外，钩子应该首先检查调用钩子的实体是一个节点，这就是pathauto.api.php中示例钩子所做的。

/**
 * Alter the pattern to be used before an alias is generated by Pathauto.
 *
 * This hook will only be called if a default pattern is configured (on
 * admin/config/search/path/patterns).
 *
 * @param \Drupal\pathauto\PathautoPatternInterface $pattern
 *   The Pathauto pattern to be used.
 * @param array $context
 *   An associative array of additional options, with the following elements:
 *   - 'module': The module or entity type being aliased.
 *   - 'op': A string with the operation being performed on the object being
 *     aliased. Can be either 'insert', 'update', 'return', or 'bulkupdate'.
 *   - 'source': A string of the source path for the alias (e.g. 'node/1').
 *   - 'data': An array of keyed objects to pass to token_replace().
 *   - 'bundle': The sub-type or bundle of the object being aliased.
 *   - 'language': A string of the language code for the alias (e.g. 'en').
 *     This can be altered by reference.
 */
function hook_pathauto_pattern_alter(\Drupal\pathauto\PathautoPatternInterface $pattern, array $context) {
  // Switch out any [node:created:*] tokens with [node:updated:*] on update.
  if ($context['module'] == 'node' && ($context['op'] == 'update')) {
    $pattern->setPattern(preg_replace('/\[node:created(\:[^]]*)?\]/', '[node:updated$1]', $pattern->getPattern()));
  }
}

所示钩子的代码类似于下面的代码。

use Drupal\pathauto\PathautoPatternInterface;

function mymodule_pathauto_pattern_alter(PathautoPatternInterface $pattern, array $context) {
  if ($context['module'] == 'node' && $context['op'] === "update" && $context['bundle'] === "news") {
    $node = $context['data']['node'];
    $archived = $node->get('field_archived')->getString() === "1";
    if ($archived) {
      $pattern->setPattern('/archive/[node::title]');
    }
  }
}

对象已经通过引用传递；没有必要将第一个参数定义为&$pattern。

我还将验证没有实现hook_pathauto_pattern_alter()的其他模块在问题中显示的实现之后调用它们的实现，这就是改变同一个实体和同一个包的模式。

参考资料

• PathautoGenerator::updateEntityAlias()
• PathautoGenerator::createEntityAlias()
• pathauto.api.php