Yii中

遞歸找到嵌套活動記錄關係假設你有類似下面的關係，要找到與特定客戶下的所有賬戶：Yii中

- Customer 1 
    - accounts 
     - Account 1 
    - customers 
     - Customer 2 
      - accounts 
       - Account 2 
       - Account 3 
     - Customer 3 
      - customers 
       - Customer 4 
        - accounts 
         - Account 4 
         - Account 5

（對於客戶1，這是佔1， 2，3，4和5;對於客戶3，它是賬戶4和5;等等）

你會怎麼做？

這已經在我的項目中出現了幾次，我很好奇別人怎麼解決它。

這裏的gist of my solution（在鏈接代碼中的註釋）：

<?php 
public function getNestedRelated($nested, $from, $nestedCriteria = array(), $fromCriteria = array(), $maxLevels = false, $includeFirst = true, $_currentLevel = 0, &$_recursedSoFar = array()) 
{ 
    // Always return an array (for array_merge) 
    $related = array(); 

    // Prevent infinite recursion 
    if (in_array($this->primaryKey, $_recursedSoFar)) { 
     return $related; 
    } 
    $_recursedSoFar[] = $this->primaryKey; 

    // Nested records at this level 
    if ($_currentLevel > 0 || $includeFirst) { 
     // Whether to refresh nested records at this level. If criteria are 
     // provided, the db is queried anyway. 
     $refreshNested = false; 
     $related  = $this->getRelated($nested, $refreshNested, $nestedCriteria); 
    } 

    // Handle singular ("HAS_ONE", "BELONGS_TO") relations 
    if (!is_array($related)) { 
     $related = array($related); 
    } 

    // Don't recurse past the max # of levels 
    if ($maxLevels !== false && $_currentLevel > $maxLevels) { 
     return $related; 
    } 

    // Whether to refresh children of this record. If criteria are provided, 
    // the db is queried anyway. 
    $refreshFrom = false; 

    // Go down one more level 
    $_currentLevel++; 
    foreach ($this->getRelated($from, $refreshFrom, $fromCriteria) as $child) { 
     // Recursive step 
     $nestedRelated = $child->getNestedRelated($nested, $from, $nestedCriteria, $fromCriteria, $maxLevels, $includeFirst, $_currentLevel, $_recursedSoFar); 
     $related  = array_merge($related, $nestedRelated); 
    } 
    return $related; 
}

來源

2014-03-01 danonanimal