在Drupal 7中更改數據集的搜索查詢條件

Question

我對Drupal非常陌生，嘗試構建一個模塊，該模塊允許管理員使用關鍵字標記節點以將節點提升到搜索結果頂部。

我有一個單獨的數據庫表的關鍵字和各自的節點ID。此表是聯合在一起通過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然後生成幾乎正確的查詢......

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 「問題行」 到閱讀...

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

...我可以使用什麼鉤子來添加該OR條件？

• 我不想破解Drupal的核心。
• 我不想更改聯合/子查詢（不是我的決定）。
• 我會稍後優化查詢 - 功能更重要。

謝謝，聰明的人！

Answer 1

感謝來自@Clive一些有用的建議，以及大量的試驗和錯誤，我有終於解決了這個問題。

下面是最終代碼...

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數組，循環通過並找到問題的條件的索引，將其刪除，然後用新的一個沿着作爲一個db_or()

這部分重新添加相同的條件是未測試，很可能不會逐字工作，但它應該給你一個起點：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); 
}