Node.js Mongoose填充不填充嵌套数组数据
所以我有一个用户模型,它指的是博客 用户模型Node.js Mongoose填充不填充嵌套数组数据,node.js,mongodb,mongoose,nosql,Node.js,Mongodb,Mongoose,Nosql,所以我有一个用户模型,它指的是博客 用户模型 const mongoose = require("mongoose"); const Schema = mongoose.Schema; const bcrypt = require("bcryptjs"); const userSchema = new Schema( { email: { type: String, required: true, index: { unique:
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const bcrypt = require("bcryptjs");
const userSchema = new Schema(
{
email: {
type: String,
required: true,
index: {
unique: true
}
},
password: {
type: String,
required: true
},
name: {
type: String,
required: true
},
website: {
type: String
},
bio: {
type: String
},
blogs: [
{
type: Schema.Types.ObjectId,
ref: "Blog"
}
]
},
{
timestamps: {
createdAt: "created_at",
updatedAt: "updated_at"
}
}
);
userSchema.pre("save", function(next) {
const user = this;
if (!user.isModified("password")) return next();
bcrypt.genSalt(10, function(err, salt) {
if (err) return next(err);
bcrypt.hash(user.password, salt, function(err, hash) {
if (err) return next(err);
user.password = hash;
next();
});
});
});
userSchema.methods.comparePassword = function(password, next) {
bcrypt.compare(password, this.password, function(err, isMatch) {
if (err) return next(err);
next(null, isMatch);
});
};
const User = mongoose.model("User", userSchema);
module.exports = User;
这是我的博客集,它引用了评论模型
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const blogSchema = new Schema(
{
title: {
type: String,
required: true
},
body: {
type: String,
required: true
},
author: {
type: Schema.Types.ObjectId,
ref: "User"
},
likesCount: {
type: Number
},
comments: [
{
type: Schema.Types.ObjectId,
ref: "Comment"
}
]
},
{
timestamps: {
createdAt: "created_at",
updatedAt: "updated_at"
}
}
);
const Blog = mongoose.model("Blog", blogSchema);
module.exports = Blog;
这是我的评论模型,它参考了用户模型
const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const CommentSchema = new Schema(
{
body: {
type: String,
required: true
},
likesCount: {
type: Number
},
user: {
type: Schema.Types.ObjectId,
ref: "User"
}
},
{
timestamps: {
createdAt: "created_at",
updatedAt: "updated_at"
}
}
);
const Comment = mongoose.model("Comment", CommentSchema);
module.exports = Comment;
我想要的是,如果我获取用户数据,我想获取博客以及评论数据
我有这个密码
exports.getCurrentUser = async (req, res) => {
const ObjectId = mongoose.Types.ObjectId;
const users = await User.findById({ _id: new ObjectId(req.user._id) })
.populate({
path: "blogs",
model: "Blog"
})
.exec();
console.log(users);
return res.status(200).json(users);
};
但这并不是在博客上流行
如何实现这种嵌套引用获取?我认为问题在于模型必须是模型引用,而不是模型名称。所以它必须是
model:Blog
,而不是模型:“Blog”
我还建议重新设计模式,因为模型之间有很多引用。当你添加、插入或删除博客或评论时,你必须进行2次db呼叫
我将从用户模式中删除blogs字段,从blog模式中删除comments字段,并设置如下虚拟填充:
用户架构:
const userSchema=新模式(
{
电邮:{
类型:字符串,
要求:正确,
索引:{
独一无二:真的
}
},
密码:{
类型:字符串,
必填项:true
},
姓名:{
类型:字符串,
必填项:true
},
网站:{
类型:字符串
},
生物:{
类型:字符串
}
},
{
时间戳:{
createdAt:“已创建”,
updatedAt:“updated_at”
},
toJSON:{
虚拟的:真的
}
}
);
userSchema.virtual(“博客”{
参考:“博客”,
外域:“作者”,
localField:“\u id”
});
博客架构:
const blogSchema=新模式(
{
标题:{
类型:字符串,
必填项:true
},
正文:{
类型:字符串,
必填项:true
},
作者:{
类型:Schema.Types.ObjectId,
参考:“用户”
},
LikeCount:{
类型:编号
}
},
{
时间戳:{
createdAt:“已创建”,
updatedAt:“updated_at”
},
toJSON:{virtuals:true}
}
);
blogSchema.virtual(“注释”{
参考:“评论”,
外域:“博客”,
localField:“\u id”
});
注意,我在两个模式中都添加了toJSON:{virtuals:true}
选项
现在,您可以通过以下查询获取带有评论的用户博客:
const user=wait user.findById(请求用户id)
.填充({
路径:“博客”,
填充:“注释”
})
.选择(“-密码”)
.exec();
测试:
让我们假设您需要这些示例文档
db={
"users": [
{
"_id": "5e53b1726f41c765fc4def9c",
"email": "user1@gmail.com",
"password": "$2a$10$.heEhkN2BhxZiw8upgjGQe.r3Gt78JVfuAqLqf6lHwireaKJSrrTO",
"name": "User1"
},
{
"_id": "5e53b1906f41c765fc4def9d",
"email": "user2@gmail.com",
"password": "$2a$10$tEaXpoeH5iXVzqmzozAFOOu.Nxb32Ssy1XS5CAqad7qqanHQkrqjK",
"name": "User2"
},
{
"_id": "5e53b1996f41c765fc4def9e",
"email": "user3@gmail.com",
"password": "$2a$10$4s34RLnSd75WeG8K.gzxxeixkruplzW0vpb7PJR/aL1d3Ia31wj.W",
"name": "User3"
}
],
"blogs": [
{
"_id": "5e53b26c6f41c765fc4def9f",
"title": "Blog1 Title",
"body": "Blog1 Body",
"author": "5e53b1726f41c765fc4def9c"
},
{
"_id": "5e53b2896f41c765fc4defa1",
"title": "Blog2 Title",
"body": "Blog2 Body",
"author": "5e53b1726f41c765fc4def9c"
}
],
"comments": [
{
"_id": "5e53b2f86f41c765fc4defa3",
"body": "Comment1 (user2 on user1's blog1)",
"user": "5e53b1906f41c765fc4def9d",
"blog": "5e53b26c6f41c765fc4def9f"
},
{
"_id": "5e53b3246f41c765fc4defa4",
"body": "Comment2 (user3 on user1's blog1)",
"user": "5e53b1996f41c765fc4def9e",
"blog": "5e53b26c6f41c765fc4def9f"
},
{
"_id": "5e53b34c6f41c765fc4defa5",
"body": "Comment3 (user2 on user1's blog2)",
"user": "5e53b1906f41c765fc4def9d",
"blog": "5e53b2896f41c765fc4defa1"
}
]
}
对于id为“5e53b1726f41c765fc4def9c”的用户,结果如下所示:
另一个选项是使用MongoDB聚合框架。
使用此选项,您可以删除我为虚拟填充添加的选项
const users=wait User.aggregate([
{
$match:{
_id:请求用户。\u id
}
},
{
$项目:{
密码:0
}
},
{
$lookup:{
来自:“博客”,
让我们:{
用户id:“$\u id”
},
管道:[
{
$match:{
$expr:{
$eq:[“$$userId”,“$author”]
}
}
},
{
$lookup:{
来自:“评论”,
让我们:{
blogId:“$\u id”
},
管道:[
{
$match:{
$expr:{
$eq:[“$blog”、“$$blogId”]
}
}
}
],
as:“评论”
}
}
],
如:“博客”
}
}
]);
用户[0]
将为您提供与选项1相同的结果。谢谢虚拟一个确实有效。虽然我自己尝试过虚拟一个,但它在博客上有效,但不适用于评论。谢谢一次again@YashGupta不客气。如果你也能投赞成票,我将不胜感激。
{
"_id": "5e53b1726f41c765fc4def9c",
"email": "user1@gmail.com",
"name": "User1",
"created_at": "2020-02-24T11:20:18.343Z",
"updated_at": "2020-02-24T11:20:18.343Z",
"__v": 0,
"blogs": [
{
"_id": "5e53b26c6f41c765fc4def9f",
"title": "Blog1 Title",
"body": "Blog1 Body",
"author": "5e53b1726f41c765fc4def9c",
"created_at": "2020-02-24T11:24:28.895Z",
"updated_at": "2020-02-24T11:24:28.895Z",
"__v": 0,
"comments": [
{
"_id": "5e53b2f86f41c765fc4defa3",
"body": "Comment1 (user2 on user1's blog1)",
"user": "5e53b1906f41c765fc4def9d",
"blog": "5e53b26c6f41c765fc4def9f",
"created_at": "2020-02-24T11:26:48.506Z",
"updated_at": "2020-02-24T11:26:48.506Z",
"__v": 0
},
{
"_id": "5e53b3246f41c765fc4defa4",
"body": "Comment2 (user3 on user1's blog1)",
"user": "5e53b1996f41c765fc4def9e",
"blog": "5e53b26c6f41c765fc4def9f",
"created_at": "2020-02-24T11:27:32.305Z",
"updated_at": "2020-02-24T11:27:32.305Z",
"__v": 0
}
],
"id": "5e53b26c6f41c765fc4def9f"
},
{
"_id": "5e53b2896f41c765fc4defa1",
"title": "Blog2 Title",
"body": "Blog2 Body",
"author": "5e53b1726f41c765fc4def9c",
"created_at": "2020-02-24T11:24:57.078Z",
"updated_at": "2020-02-24T11:24:57.078Z",
"__v": 0,
"comments": [
{
"_id": "5e53b34c6f41c765fc4defa5",
"body": "Comment3 (user2 on user1's blog2)",
"user": "5e53b1906f41c765fc4def9d",
"blog": "5e53b2896f41c765fc4defa1",
"created_at": "2020-02-24T11:28:12.551Z",
"updated_at": "2020-02-24T11:28:12.551Z",
"__v": 0
}
],
"id": "5e53b2896f41c765fc4defa1"
}
],
"id": "5e53b1726f41c765fc4def9c"
}