Javascript 无法将may的属性保存到多个关系模型（mongoose）
我正在创建一家书店，我有三种模式：书籍、作者和流派。 Books存储作者ID数组和流派ID数组。作者存储图书ID数组。流派也有书籍ID数组Javascript 无法将may的属性保存到多个关系模型（mongoose）,javascript,node.js,async-await,many-to-many,mongoose-schema,Javascript,Node.js,Async Await,Many To Many,Mongoose Schema,我正在创建一家书店，我有三种模式：书籍、作者和流派。 Books存储作者ID数组和流派ID数组。作者存储图书ID数组。流派也有书籍ID数组 BookSchema = new mongoose.Schema({ title: String, authors: [ { type: mongoose.Schema.Types.ObjectId, ref: "Author" }
BookSchema = new mongoose.Schema({
title: String,
authors: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Author"
}
],
image: String,
description: String,
price: Number,
genres: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Genre"
}
],
});
AuthorSchema = new mongoose.Schema({
name: String,
books: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Book"
}
],
});
GenreSchema = new mongoose.Schema({
name: String,
books: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Book"
}
],
});
{
title: "The Monster at the End of This Book",
authors: ["Jon Stone"],
img: "https://images-na.jpg",
price: "0.35",
description: "Carve out family time for ...",
genres: ["Children's Humour (Books)"]
},
Book.deleteMany({}, () => {
insertBooks().then(insertGenres).then(insertAuthors).then(connectBooksToAuthors);
}).then(function () {
connectBooksToGenres();
})
async function insertAuthors() {
let authorsArr = [];
data.forEach(dataPiece => {
dataPiece.authors.forEach(author => {
if (authorsArr.indexOf(author) === -1) {
authorsArr.push(author)
}
})
})
authorsArr.forEach(author => {
Author.findOne({name: author}, (err, a) => {
if (!a) {
Author.create({name: author});
}
})
})
}
async function insertGenres() {
let genresArr = [];
data.forEach(dataPiece => {
dataPiece.genres.forEach(genre => {
if (genresArr.indexOf(genre) === -1) {
genresArr.push(genre);
}
})
})
genresArr.forEach(genre => {
Genre.findOne({name: genre}, (err, g) => {
if (!g) {
Genre.create({name: genre});
}
})
})
}
async function insertBooks() {
data.forEach((dataPiece) => {
let obj = {
"title": `${dataPiece.title}`,
'description': `${dataPiece.description}`,
"price": `${dataPiece.price}`,
};
Book.create(obj);
})
}
async function connectBooksToAuthors() {
data.forEach(dataPiece => {
Book.findOne({"title": `${dataPiece.title}`}, (err, book) => {
let authorsArr = [];
dataPiece.authors.forEach(authorsName => {
Author.findOne({name: authorsName}, (err, author) => {
author.books.push(book);
author.save();
authorsArr.push(author);
if (authorsArr.length === dataPiece.authors.length) {
book.authors = [...authorsArr];
book.save();
}
});
});
})
})
}
async function connectBooksToGenres() {
data.forEach(dataPiece => {
Book.findOne({"title": `${dataPiece.title}`}, (err, book) => {
let genresArr = [];
dataPiece.genres.forEach(genreName => {
Genre.findOne({name: genreName}, (err, genre) => {
genre.books.push(book);
genre.save();
genresArr.push(genre);
if (genresArr.length === dataPiece.genres.length) {
book.genres = [...genresArr];
book.save();
}
});
});
})
})
}
在数据库中，作者的数组被归档。Ganres数组不是问题可能在book.save（）中，从ConnectBooks到Authors和connectBooksToGenres的调用，但我不知道如何修复它？您还没有真正告诉我们您的具体问题是什么。抱歉，在问题的末尾添加了您的代码使用
。然后（）wait