在Drupal 7中更改数据集的搜索查询条件

Question

我对Drupal非常陌生，尝试构建一个模块，该模块允许管理员使用关键字标记节点以将节点提升到搜索结果顶部。

我有一个单独的数据库表的关键字和各自的节点ID。此表是联合在一起通过hook_query_alter的search_index表...

function mos_search_result_forcer_query_alter(QueryAlterableInterface &$query) { 
    if (get_class($query) !== 'PagerDefault') { //<< check this because this function will mod all queries elsewise 
     return; 
    } 

    // create unioned search index result set... 
    $index = db_select('search_index', 's'); 

    $index->addField('s', 'sid'); 
    $index->addField('s', 'word'); 
    $index->addField('s', 'score'); 
    $index->addField('s', 'type'); 

    $msrfi = db_select('mos_search_result_forcer', 'm'); 

    $msrfi->addField('m', 'nid', 'sid'); 
    $msrfi->addField('m', 'keyword', 'word'); 
    $msrfi->addExpression('(SELECT MAX(score) + m.id/(SELECT MAX(id) FROM {mos_search_result_forcer}) FROM {search_index})', 'score'); 
    $msrfi->addExpression(':type', 'type', array(':type' => 'node')); 

    $index->union($msrfi); 

    $tables =& $query->getTables(); 

    $tables['i']['table'] = $index; 

    return $query; 
} 

的Drupal然后生成几乎正确的查询......

SELECT 
    i.type AS type, i.sid AS sid, SUM(CAST('10' AS DECIMAL) * COALESCE(((12.048628015788 * i.score * t.count)), 0)/CAST('10' AS DECIMAL)) AS calculated_score 
FROM (
    SELECT 
     s.sid AS sid, s.word AS word, s.score AS score, s.type AS type 
    FROM 
     search_index s 
    UNION SELECT 
     m.nid AS sid, m.keyword AS word, (
      SELECT 
       MAX(score) + m.id/(SELECT MAX(id) FROM mos_search_result_forcer) 
      FROM 
       search_index 
     ) AS score, 'node' AS type 
    FROM 
     mos_search_result_forcer m 
) i 
INNER JOIN node n ON n.nid = i.sid 
INNER JOIN search_total t ON i.word = t.word 
INNER JOIN search_dataset d ON i.sid = d.sid AND i.type = d.type 
WHERE (n.status = '1') 
AND((i.word = 'turtles')) 
AND (i.type = 'node') 

/* this is the problem line... */ 
AND((d.data LIKE '% turtles %' ESCAPE '\\')) 
/* ...end problem line */ 

GROUP BY i.type, i.sid 
HAVING (COUNT(*) >= '1') 
ORDER BY calculated_score DESC 
LIMIT 10 OFFSET 0 

...我需要的是 “问题行” 到阅读...

AND((d.data LIKE '% turtles %' ESCAPE '\\') OR (d.sid IN (SELECT nid FROM mos_search_result_forcer))) 

...我可以使用什么钩子来添加该OR条件？

• 我不想破解Drupal的核心。
• 我不想更改联合/子查询（不是我的决定）。
• 我会稍后优化查询 - 功能更重要。

谢谢，聪明的人！

Answer 1

感谢来自@Clive一些有用的建议，以及大量的试验和错误，我有终于解决了这个问题。

下面是最终代码...

function mos_search_result_forcer_module_implements_alter(&$imps, $hook) { 
    if ($hook !== 'query_alter' || !array_key_exists('mos_search_result_forcer', $imps)) { 
     return; 
    } 

    $imp = $imps['mos_search_result_forcer']; 

    unset($imps['mos_search_result_forcer']); 

    $imps['mos_search_result_forcer'] = $imp; 
} 

function mos_search_result_forcer_query_alter(QueryAlterableInterface &$query) { 
    if (get_class($query) !== 'PagerDefault') { //<< check this because this function will mod all queries elsewise 
     return; 
    } 

    // create unioned search index result set... 
    $index = db_select('search_index', 's'); 

    $index->addField('s', 'sid'); 
    $index->addField('s', 'word'); 
    $index->addField('s', 'score'); 
    $index->addField('s', 'type'); 

    $msrfi = db_select('mos_search_result_forcer', 'm'); 

    $msrfi->addField('m', 'nid', 'sid'); 
    $msrfi->addField('m', 'keyword', 'word'); 
    $msrfi->addExpression('(SELECT MAX(score) + m.id/(SELECT MAX(id) FROM {mos_search_result_forcer}) FROM {search_index})', 'score'); 
    $msrfi->addExpression(':type', 'type', array(':type' => 'node')); 

    $index->union($msrfi); 

    $tables =& $query->getTables(); 

    $tables['i']['table'] = $index; 

    // needs special "or" condition to keep from filtering out forced resutls... 
    class MSRFPagerDefaultHelper extends PagerDefault { //<< override to gain access to protected props 
     static function msrfHelp(PagerDefault &$pagerDefault) { 
      $searchQuery =& $pagerDefault->query; 

      MSRFSearchQueryHelper::msrfHelp($searchQuery); 
     } 
    } 

    class MSRFSearchQueryHelper extends SearchQuery { //<< override to gain access to protected props 
     static function msrfHelp(SearchQuery &$searchQuery) { 
      $conditions =& $searchQuery->conditions; 

      $condition = db_or()->condition($conditions)->condition('d.sid', db_select('mos_search_result_forcer')->fields('mos_search_result_forcer', array('nid')), 'IN'); 

      $searchQuery->conditions = $condition; 
     } 
    } 

    MSRFPagerDefaultHelper::msrfHelp($query); 

    return $query; //<< i don't think this is needed as var is reffed - just for good measure, i guess 
} 

Answer 2

的基本原理是抓住conditions数组，循环通过并找到问题的条件的索引，将其删除，然后用新的一个沿着作为一个db_or()

这部分重新添加相同的条件是未测试，很可能不会逐字工作，但它应该给你一个起点：以hook_module_implements_alter

$conditions =& $query->conditions(); 
$index = FALSE; 
$removed_condition = NULL; 

for ($i = 0, $l < count($conditions); $i < $l; $i++) { 
    if ($conditions[$i]['field'] == 'd.data' && $conditions[$i]['operator'] == 'LIKE') { 
    $index = $i; 
    $removed_condition = $condition; 

    break; 
    } 
} 

if ($index !== FALSE) { 
    unset($conditions[$index]); 

    $sub_query = db_select('mos_search_result_forcer')->fields('mos_search_result_forcer', array('nid')); 
    $new_condition = db_or() 
    ->condition('d.data', $removed_condition['value'], 'LIKE') 
    ->condition('d.sid', $sub_query, 'IN'); 

    $query->condition($new_condition); 
}