誰能幫我拿到嵌套陣列

Question

計數的號碼，我希望計算每個不同的「TLID」「tlikers」的數**

{ 
      "_id" : ObjectId("55d8a835363ffb2157589145"), 
      "like" : [ 
       { 
        "tlid" : 111, 
        "tlikers" : [ 
         "amudibarongo@gmail.com", 
         "harunabarongo@gmail.com" 
        ] 
       }, 
       { 
        "tlid" : 112, 
        "tlikers" : [ 
         "amudibarongo@gmail.com", 
         "harunabarongo@gmail.com" 
        ] 
       }, 
       { 
        "tlid" : 113, 
        "tlikers" : [ 
         "amudibarongo@gmail.com", 
         "harunabarongo@gmail.com", 
         "jumabarongo@gmial.com" 
        ] 
       } 
      ], 
      "tlikeid" : "amudibarongo@gmail.com" 
     } 

Answer 1

可以使用聚合查詢這樣的：

db.collection.aggregate([ 
    {$unwind: "$like"}, 
    {$project: {"tlid": "$like.tlid", "count": {$size: "$like.tlikers"}}}, 
    {$group: {_id: "$_id", "likes": {$push: {tlid: "$tlid", count : "$count"}}}} 
]) 

這將產生類似的結果：

[ 
    { 
     "_id" : ObjectId("55d8a835363ffb2157589145"), 
     "likes" : [ 
      { 
       "tlid" : 111, 
       "count" : 2 
      }, 
      { 
       "tlid" : 112, 
       "count" : 2 
      }, 
      { 
       "tlid" : 113, 
       "count" : 3 
      } 
     ] 
    } 
] 

Answer 2

下面寫的Python腳本會得到你想要的輸出：

（假設集合名稱是：「樣品」）

data = sample.find() 
for doc in data: 
    NumberOfEntries = len(doc['like']) 
    for i in range(0,NumberOfEntries): 
     print "tlid : ",doc['like'][i]['tlid'], "Count of tlikers:",len(doc['like'][i]['tlikers']) 

而不是在控制檯上進行打印，還可以將這些值存儲在字典中繼續使用。