如何在MongoDB中查找數組中的所有數組

Question

下面是陣列聯系人的架構。 contacts數組有一個字段hashtag，它是另一個數組。 如何查找具有特定主題標簽的所有聯系人？ 例如所有帶標簽“zxc”的聯系人？

"contacts" : [
    {
        "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
        "personEmailId" : "tell.fadgfdg@gmail.com",
        "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
        "verified" : true,
        "favorite" : true,
        "linkedinUserName" : null,
        "facebookUserName" : null,
        "twitterUserName" : "IamlifePaul",
        "count" : 2,
        "relationshipStrength_updated" : 0,
        "contactRelation" : {
            "decisionmaker_influencer" : null,
            "prospect_customer" : "prospect"
        },
        "source" : "abc",
        "mobileNumber" : "3546789",
        "skypeId" : "123",
        "designation" : "test",
        "companyName" : "Something",
        "location" : "Hyderabad, Telangana, India",
        "personName" : "Naveen Paul",
        "personId" : "565022d7dbeaeb9e17fc7083",
        "hashtag" : [

            "latestTag",
            "anotherTag",
            "#hash",
            "openLove",
            "hellTwo",
            "working?",
            "hello",
            "lol",
            "zxc"
        ],
        "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
    },
{
        "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
        "personEmailId" : "naveenpaul.fadgfdg@gmail.com",
        "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
        "verified" : true,
        "favorite" : true,
        "linkedinUserName" : null,
        "facebookUserName" : null,
        "twitterUserName" : "IamlifePaul",
        "count" : 2,
        "relationshipStrength_updated" : 0,
        "contactRelation" : {
            "decisionmaker_influencer" : null,
            "prospect_customer" : "prospect"
        },
        "source" : "abc",
        "mobileNumber" : "3546789",
        "skypeId" : "123",
        "designation" : "test",
        "companyName" : "Something",
        "location" : "Hyderabad, Telangana, India",
        "personName" : "Naveen Paul",
        "personId" : "565022d7dbeaeb9e17fc7083",
        "hashtag" : [

            "latestTag",
            "anotherTag",
            "#hash",
            "openLove",
            "hellTwo",
            "working?",
            "hello",
            "lol",
            "zxc"
        ],
        "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
    },
{
        "addedDate" : ISODate("2015-12-02T09:06:09.891Z"),
        "personEmailId" : "naveenpaul.fadgfdg@gmail.com",
        "_id" : ObjectId("565eb481bf35eeb83d7f9f13"),
        "verified" : true,
        "favorite" : true,
        "linkedinUserName" : null,
        "facebookUserName" : null,
        "twitterUserName" : "IamlifePaul",
        "count" : 2,
        "relationshipStrength_updated" : 0,
        "contactRelation" : {
            "decisionmaker_influencer" : null,
            "prospect_customer" : "prospect"
        },
        "source" : "abc",
        "mobileNumber" : "3546789",
        "skypeId" : "123",
        "designation" : "test",
        "companyName" : "Something",
        "location" : "Hyderabad, Telangana, India",
        "personName" : "Naveen Paul",
        "personId" : "565022d7dbeaeb9e17fc7083",
        "hashtag" : [

            "polly",
            "tagger",
            "#hash",
            "working?",
            "hello",
            "lol",
            "zxc"
        ],
        "lastInteracted" : ISODate("2015-12-08T05:07:53.746Z")
    }

我做了這個查詢 - db.myColl.find({"contacts.hashtag":"zxc"},{"contacts":{$elemMatch:{"hashtag":"zxc"}}}).pretty()返回只有一個聯系人。 我需要得到所有聯系人。

Answer 1

您可以通過聚合框架來完成：

1）進行初始匹配以減少聚合的輸入集

2）展開聯系人字段。

3）使用＃zxc標簽過濾掉聯系人

4）按ID分組並將聯系人放在“聯系人”字段中。

db.getCollection('contacts').aggregate([
    {$match: {"contacts.hashtag":"zxc"}},
    {$unwind: "$contacts"},
    {$match: {"contacts.hashtag":"zxc"}},
    {$group: {_id:"$_id", "contacts": {$push:"$contacts"}}}
])

Answer 2

您可以使用

對於單個doc中的多個hashtag

db.myColl.find({"contacts.hashtag":{$in : ['zxc','anotherTag']}});
//will return all doc with any of the two hashtags.

對於單個主題標簽

   db.myColl.find({"contacts.hashtag":'zxc'});
  //return all documents with hashtag 'zxc'

請參考$ in