MongoDB的多陣列個別陣列上搜索

Question

我的目標是建立內部陣列主陣列當搜索用戶標識爲1 下面是我的數據

{ "_id" : 2, 
    "name" : "test1", 
    "data" :[{"_id" : "1","file" : "nic", "userid" : [1,2 ]}, 
      {"_id" : "2","file" : "nic1","userid" : [1 ] }, 
      {"_id" : 3,"file" : "nick2","userid" : [1,2 ]} 
]}, 

{ "_id" : 3, 
    "name" : "test2", 
    "data" : [{"_id" : "1","file" : "nic","userid" : [1,2 ] }, 
      {"_id" : "2","file" : "nic1", "userid" : [3,2 ] } 
    ]} 

需要走出去把儘可能

{"_id" : 1,"file" : "nic", "userid" : [1,2 ],"main_name" : "test1","main_id" : 2}, 
{"_id" : 2,"file" : "nic1","userid" : [1 ] ,"main_name" : "test1","main_id" : 2 }, 
{"_id" : 3,"file" : "nick2","userid" : [1,2 ],"main_name" : "test2","main_id" : 3}, 
{"_id" : 1,"file" : "nic","userid" : [1,2 ] ,"main_name" : "test2" ,"main_id" : 3} 

Answer 1

基本上與你的last question相同的答案，但沒有$group來重建陣列和使用$project，而是從已經非規範化的數組元素重構文檔。

$collection->aggregate(array(
    array('$match' => array("data.userid" => 1)), 
    array('$unwind' => '$data'), 
    array('$match' => array('data.userid' => 1)), 
    array(
     '$project' => array(
      '_id' => '$data._id', 
      'nic' => '$data.nic', 
      'user_id' => '$data.user_id', 
      'main_name' => '$name', 
      'main_id' => '$_id' 
     ) 
    ) 
))