2012-06-26 57 views
1

我试图为网站设置消息收件箱,并且需要将用户(发件人或收件人)的所有文档分组到线程中。这些消息收集充满了这样的文件:MongoDb/PHP,无法使用聚合框架使分组正常工作

{ 
"_id" : ObjectId("4fe8d8ac0a6d2ad9350000d9"), 
"message" : "booo", 
"recipient" : { 
    "user_id" : ObjectId("4fd9f0600a6d2ac94f000003"), 
    "viewed" : 1 
}, 
"sender" : { 
    "user_id" : ObjectId("4fdb3b780a6d2a9d29000047"), 
}, 
"thread" : "c03a4e49348d009f4ddd8aae325128e1" 
"date_sent" : ISODate("2012-06-25T21:31:24.230Z"), 

}

我能够使用蒙戈的组功能得到想要的结果,但不能进行排序或组的限制,所以我非常喜欢使用聚合框架,但我无法获得理想的结果。基本上,我需要这样做:

$groupBy = array(
      'thread' => 1, 
     ); 
    $initial = array('count' => 0); 

    $reduce = "function (obj, prev) { 
      prev.count++; 
      prev.message = obj.message; 
      prev.sender = obj.sender.user_id; 
      prev.recipient = obj.recipient.user_id; 
      prev.date_sent = obj.date_sent; 
      prev.viewed = obj.recipient.viewed; 
     }"; 

    $condition = array(
      '$or' => array(
          array('sender.user_id'  => new MongoId($options['user_id'])), 
          array('recipient.user_id' => new MongoId($options['user_id'])) 
         ) 
     ); 
    return $this->_collection->group($groupBy, $initial, $reduce, $condition); 

随着总框架,但我没有得到我需要的结果...基本上,我有这样的:

$condition = array(
      '$or' => array(
          array('sender.user_id'  => new MongoId($options['user_id'])), 
          array('recipient.user_id' => new MongoId($options['user_id'])) 
         ) 
     ); 
    $returnFields = array(
      'message'   => 1, 
      'sender.user_id' => 1, 
      'recipient.user_id' => 1, 
      'date_sent'   => 1, 
      'thread'   => 1, 
     ); 
    $sort  = array('date_sent' => 1); 
    $groupBy = array('_id'  => '$thread'); 

    $input = array(
     'aggregate' => $this->_collectionName, 
     'pipeline' => array(
       array('$project' => $returnFields), 
       array('$match' => $condition), 
       array('$group' => $groupBy), 
       array('$sort'  => $sort), 
      ) 
    ); 
    return $this->_db->command($input); 

而且它只有返回线程,就像它忽略了我的$项目...任何想法?

+0

我已经想通了。不太确定为什么$ project不能运行,但是,我可以使用$ first运算符来选择$ group语句中的字段 – giantNinja

回答

0

我已经想通了。真的不知道为什么在$项目不携带虽不过,我可以使用$第一家运营商选择在$组声明

$condition = array(
      '$or' => array(
          array('sender.user_id'  => new MongoId($options['user_id'])), 
          array('recipient.user_id' => new MongoId($options['user_id'])) 
         ) 
     ); 

    $sort  = array('date_sent' => -1); 

    $groupBy = array(
      '_id'  => '$thread', 
      'sender' => array('$first' => '$sender.user_id'), 
      'recipient' => array('$first' => '$recipient.user_id'), 
      'date_sent' => array('$first' => '$date_sent'), 
      'message' => array('$first' => '$message'), 
      'viewed' => array('$first' => '$recipient.viewed'), 
     ); 

    $input = array(
     'aggregate' => $this->_collectionName, 
     'pipeline' => array(
       array('$match' => $condition), 
       array('$sort'  => $sort), 
       array('$group' => $groupBy), 
       array('$sort'  => $sort), 

      ) 
    ); 

    return $this->_db->command($input); 

基本上,我需要匹配正确的文件领域,他们如此排序最新的消息是第一个,做$组,我可以用$ first操作符选择字段,然后再次对它们进行排序,以便它们按照正确的顺序排列。没有想到这将是必要的,但这似乎工作正常。

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