Node.js 我如何从mongodb nodejs获得平均评级的产品连接价值？
参数：-Node.js 我如何从mongodb nodejs获得平均评级的产品连接价值？,node.js,mongodb,mongoose,aggregation-framework,Node.js,Mongodb,Mongoose,Aggregation Framework,参数：- "access_token": "weZVy7pnlV6CtnSQ5w8ZO9iatr5/RZrxc8vc0R5G/kyIiBhfloQuwTIVPIxUupheKHdjhpCjL2g+PsfUPe79cA==", "api_key": "T0BAnEzf6CaWwIMulImtA05nT6fDVjXKHoJM136S", "search_key": "", "latitude": 22.723755, "longitude": 75.886752, "maximum_distance
"access_token": "weZVy7pnlV6CtnSQ5w8ZO9iatr5/RZrxc8vc0R5G/kyIiBhfloQuwTIVPIxUupheKHdjhpCjL2g+PsfUPe79cA==",
"api_key": "T0BAnEzf6CaWwIMulImtA05nT6fDVjXKHoJM136S",
"search_key": "",
"latitude": 22.723755,
"longitude": 75.886752,
"maximum_distance": 5000,
"page": 1,
"limit": 5000
：----按距离同意和平均评分递减排序
：----用户评级状态（如果用户已获得评级，则评级状态为是/否），
：----组加入状态（如果用户已加入该组，则加入状态将为是/否）。
：----按组名搜索。（如果搜索键可用）。
审查和评级表集合结构：
表名=回顾
var reviewSchema = new Schema({
user_id : { type: String, required: true, default: "" },
room_id : { type: String, required: true, default: "" },
rating : { type: Number, min: 1, max: 5, require: true, default: "" },
comment: { type: String, require: true, default: "" },
created_at : { type: String, required: true, default: "" },
updated_at : { type: String, default: "" }
"data": [
{
"_id": "5e3a6f5439217717b0ed56de", // review table primary id
"user_id": "5e2ad43ec2a9ae09e8ccefb1"
"room_id": "5e3a5dc4cc182919340dc066", //room id or group id
"rating": 5,
"comment": "Good",
"created_at": "1580887892400",
"updated_at": "1580887892400",
"__v": 0,
},
{
"_id": "5e3ac1dffc459005689c8e25",
"user_id": "5e3a93d9034f591a9064195f"
"room_id": "5e3a5dc4cc182919340dc066",
"rating": 2,
"comment": "Good comment",
"created_at": "1580909023395",
"updated_at": "1580909023395",
"__v": 0,
}
]
var RoomSchema = new Schema({
name : {type: String, required: true, default: ""},
icon_url : {type: String, default: ""}, // group icon
created_by : {type: Object, required: true, default: ""}, // user id who created this group
users: [{
user_id : {type : Object, default: ""},
is_admin : {type : Boolean, default: false},
status: {type: String, default: "joined"},
join_at: {type: String, required: true},
display_name : {type: String, default: ""}
}],
invitations: [{ //new added
sender_id : {type : Object, default: ""},
receiver_id : {type : Object, default: ""}
}],
open_to_all : {type: Boolean, default:false},
created_at : {type: String, required: true},
updated_at : {type: String, required: true}, //new added
is_group : {type : Boolean, default : true},
history_enable : {type : Boolean, default : true},
invitation_blocked : {type : Boolean, default : true},
is_deleted : {type : Boolean, default: false},
group_address: {type: String, default: ""},
keyword : {type : String, required: true, default: ""}, //new added
location : {
type : {type : Object, default: "Point"},
coordinates : {type : Array, required: true, default: ""}
}});
{
"data": [
{
"_id": "5e3a5dc4cc182919340dc066", //Room id or group id
"created_at": "1580883396150",
"updated_at": "1580911250917",
"location": {
"type": "Point",
"coordinates": [
22.724515,
75.884
]
},
"keyword": "burhan",
"group_address": "Testss",
"is_deleted": false,
"invitation_blocked": true,
"history_enable": true,
"is_group": true,
"open_to_all": false,
"invitations": [],
"users": [
{
"join_at": "1580883396150",
"_id": "5e3a5dc4cc182919340dc067", //user id
"display_name": "Navlakha square 44",
"status": "joined",
"is_admin": true,
"user_id": "5e2ad43ec2a9ae09e8ccefb1"
},
{
"user_id": "5e3a93d9034f591a9064195f", //user id
"is_admin": false,
"status": "joined",
"display_name": "",
"_id": "5e3a9a8065746703c0d126b7",
"join_at": "1580905781807"
}
],
"created_by": [
{
"_id": "5e2ad43ec2a9ae09e8ccefb1",
"created_at": "1579865150137",
"last_login": "1579865150137",
"blocks": [],
"blocked": [],
"muted_room": [],
"blocked_room": [],
"categories": [],
"invitations": [],
"rooms": [
"5b27477e4b20cb8fab0d6b3a",
"5e3a5dc4cc182919340dc066",
"5e3a72b1c38a3819b89db2b7"
],
"is_blocked": false,
"is_login": true,
"online_status": true,
"socket_id": "",
"access_token": "weZVy7pnlV6CtnSQ5w8ZO9iatr5/RZrxc8vc0R5G/kyIiBhfloQuwTIVPIxUupheKHdjhpCjL2g+PsfUPe79cA==",
"notification_token": "",
"device_type": "Android",
"device_id": "",
"profile_image_url": "",
"about": "",
"phone": "123456789",
"last_name": "developer1",
"first_name": "php",
"__v": 0
}
],
"icon_url": "vkVajfRz_400x400.jpg",
"name": "Apt",
"__v": 0
}
]
db.group.aggregate([{
$lookup:
{
from: "reviews",
let: { roomId: "$data._id" },
pipeline: [
{
$match:
/** Here we're using 'setIntersection' as in lookup comparison of array with array is not possible, only downside is if data :[] in group collection */
{ $expr: { $gt: [{ $size: { $setIntersection: ["$$roomId", "$data.room_id"] } }, 0] } }
}, { $project: { _id: 0, 'data.rating': 1 } }
],
as: "reviews"
}
},
{
$addFields: {
groupJoinStatus: { $cond: [{ $size: '$reviews.data' }, true, false] }, groupRatingStatus: { $cond: [{ $size: '$reviews.data' }, true, false] }
}
}, { $unwind: { path: "$reviews", preserveNullAndEmptyArrays: true } }, {
$addFields: {
avgRating: {
$reduce: {
input: '$reviews.data',
initialValue: '$reviews.data.0.rating',
in: { $avg: ["$$value", "$$this.rating"] }
}
}
}
}, { $project: { reviews: 0 } }
])
测试：您这样说是什么意思：
如果用户已经获得评分，那么是/否？？是否要将组评级状态添加到评论集合的用户评论中？？或者，我们是否需要通过检查是否证明一个用户已加入该组以及至少一个用户已给出评论，将这些组评级状态
和组加入状态
字段添加到组文档？当您在审阅
集合中只有一个匹配文档时，上述查询适用。我想是这样的！！或者您是否在评论
集合中有多个与给定组
的数据匹配的文档。\u id
？非常感谢，#非常感谢您对我的帮助，但是我发布了一些缺少的数据库响应和期望，因此在获取正确的数据时遇到了一些问题。@Arpithahu:一旦一个问题得到了预期的答案，请不要完全更改该问题，这会使问题变得笨拙&用户不理解原始帖子的实际意图！！如果您有更改o/p的扩展问题，请提出新问题，但不要完全编辑。。