85 lines
1.8 KiB
JavaScript
85 lines
1.8 KiB
JavaScript
const { DataTypes, Model } = require('sequelize')
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class BookAuthor extends Model {
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constructor(values, options) {
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super(values, options)
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/** @type {UUIDV4} */
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this.id
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/** @type {UUIDV4} */
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this.bookId
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/** @type {UUIDV4} */
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this.authorId
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/** @type {Date} */
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this.createdAt
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}
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static removeByIds(authorId = null, bookId = null) {
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const where = {}
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if (authorId) where.authorId = authorId
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if (bookId) where.bookId = bookId
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return this.destroy({
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where
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})
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}
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/**
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* Get number of books for author
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*
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* @param {string} authorId
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* @returns {Promise<number>}
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*/
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static getCountForAuthor(authorId) {
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return this.count({
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where: {
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authorId
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}
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})
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}
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/**
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* Initialize model
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* @param {import('../Database').sequelize} sequelize
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*/
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static init(sequelize) {
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super.init(
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{
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id: {
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type: DataTypes.UUID,
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defaultValue: DataTypes.UUIDV4,
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primaryKey: true
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}
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},
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{
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sequelize,
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modelName: 'bookAuthor',
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timestamps: true,
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updatedAt: false,
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indexes: [
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{
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name: 'bookAuthor_authorId',
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fields: ['authorId']
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}
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]
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}
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)
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// Super Many-to-Many
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// ref: https://sequelize.org/docs/v6/advanced-association-concepts/advanced-many-to-many/#the-best-of-both-worlds-the-super-many-to-many-relationship
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const { book, author } = sequelize.models
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book.belongsToMany(author, { through: BookAuthor })
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author.belongsToMany(book, { through: BookAuthor })
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book.hasMany(BookAuthor, {
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onDelete: 'CASCADE'
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})
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BookAuthor.belongsTo(book)
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author.hasMany(BookAuthor, {
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onDelete: 'CASCADE'
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})
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BookAuthor.belongsTo(author)
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}
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}
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module.exports = BookAuthor
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