Question

我在Query for documents where array size is greater than 1上找到了相关的内容，它适用于find，但不适用于aggregation查询... 我有以下用户集合......

{
    "_id" : ObjectId("5ac8b91482c2345af70d4650"),
    "firstName" : "Clerk",
    "lastName" : "Kent",
    "email" : "clerk@ltc.com",
    "endorsedBy" : [],
    "followings" : [],
    "followers" : [],
    "isAdminEndorsed" : false,
}
{
    "_id" : ObjectId("5ac8ba3582c2345af70d4658"),
    "firstName" : "Bruce",
    "lastName" : "Wayne",
    "email" : "bruce@linkites.com",
    "endorsedBy" : [],
    "followings" : [ 
        ObjectId("5acc97b817c27b258bc9aa1e")
    ],
    "followers" : [],
    "isAdminEndorsed" : false
}
{
    "_id" : ObjectId("5acc97b817c27b258bc9aa1e"),
    "firstName" : "admin",
    "lastName" : "ltc",
    "email" : "superadmin@ltc.com",
    "endorsedBy" : [],
    "followings" : [],
    "followers" : [ 
        ObjectId("5ac8ba3582c2345af70d4658")
    ],
    "isAdminEndorsed" : true
}
{
    "_id" : ObjectId("5ad6ed4b7730923118b399a7"),
    "firstName" : "Batman",
    "lastName" : "tge",
    "email" : "ashishlal95@gmail.com",
    "endorsedBy" : [ 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7"), 
        ObjectId("5ad6ed4b7730923118b399a7")
    ],
    "followings" : [],
    "followers" : [],
    "isAdminEndorsed" : false
}

我想要用户列表

1）没有登录用户。

2）背书，长度应小于10。

3）isAdminEndorsed应该是假的。

4）firstName应匹配正则表达式'cle'。

我尝试过以下查询但不起作用......我在这里找不到任何东西......

const user = await User.aggregate([{
$match: {
    _id: {
        $ne: mongoose.Types.ObjectId(req.user.id)
    },
    $and: [{ endorsedBy: { $lt: 10 } }, { isAdminEndorsed: false }]
}
},{
  $project: {
      isFollow: { $in: [mongoose.Types.ObjectId(req.user.id), 
     '$followers'] },
    }
 }])

我的输出应该是

{
    "_id" : ObjectId("5ac8b91482c2345af70d4650"),
    "firstName" : "Clerk",
    "lastName" : "Kent"
}

Answer 1

您应该检查数组中absence的{{1}}。在适当的猫鼬改变后尝试此查询：如果您不想进行不区分大小写的搜索，请务必进行适当的更改，此处不需要10th element运算符。

$and

输出：

db.sample.aggregate([
{$match: {
   _id: {$ne: ObjectId("5ac8ba3582c2345af70d4658")},
   isAdminEndorsed: false,
   "endorsedBy.9":{$exists:false},
   firstName:{$regex:"cle", $options:"i"}
 }},
{$project: {
    isFollow: { $in: [ObjectId("5ac8b91482c2345af70d4650"), 
   '$followers'] },
   }
  }
 ])

$匹配$ gte和$ lte不适用于mongodb中的数组？

1 个答案: