我可以將MongoDB Document轉換爲包含數組中的數組嗎？

Question

我想改變這種看起來像這樣

{ "_id": 1, 
    "created_at": DateTimeObject, 
    "daily": [{ "impressions":13, 
       "clicks": 13, 
       "day": "2015-01-01" }, 
      { "impressions":15, 
       "clicks": 15, 
       "day": "2015-01-02" }, 
      { "impressions":20, 
       "clicks": 20, 
       "day": "2015-01-03" }] 
} 

到

文件

{ "_id": 1, 
    "impressions": [["2015-01-01", 13], 
        ["2015-01-02", 15], 
        ["2015-01-03", 20]], 
    "clicks": [["2015-01-01", 13], 
      ["2015-01-02", 15], 
      ["2015-01-03", 20]] } 

目前使用的放鬆和I組可以在下面的格式

{ "_id": 1, 
    "impressions": [{ "date": "2015-01-01", "value":13], 
        {"date":"2015-01-02", "value":15}, 
        {"date":"2015-01-03", "value":20}], 
    "clicks": [{"date": "2015-01-01", "value":13}, 
      {"date": "2015-01-01", "value":15}, 
      {"date": "2015-01-01", "value":20}] } 

我得到的數據不想在db外執行此操作，因爲大約需要從類似文檔生成150-200個折線圖，並且傾向於j有這個轉變。

編輯：這可能與地圖縮小？

Answer 1

Mongodb無法支持內部數組。你只需要放鬆和組合。