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下面是我收集的结构......如何在mongoDB上进行此查询?
{
"_id": ObjectId("5316f53228551c0af600019b"),
"age_range": {
"min": NumberInt(21)
},
"likes": {
"data": {
"0": {
"category": "Tv show",
"name": "Those Who Kill on A&E",
"created_time": "2014-03-03T15:08:02+0000",
"id": "629689387051864"
},
"1": {
"category": "Journalist",
"name": "Robin Roberts",
"created_time": "2014-02-24T18:02:43+0000",
"id": "780950061932847"
}
},
{
"_id": ObjectId("5316f53228551c0af600019b"),
`
我需要获取用户总数喜欢为每个类别。 例如
Category Name: Journalist
Total users: 10
这是一个我试过,但它不是为我工作'db.facebook_data.group({ 关键:{'likes.data.category':1} reduce:function(curr,result) –
也许尝试聚合:http:// docs.mongodb.org/manual/tutorial/aggregation-with-user-preference-data/ – John
如果'data'属性值构成为一个阵列,而不是作为属性,这将是微不足道与聚合有关。 – WiredPrairie