Init sqlite take 2

server/models/BookAuthor.js

@@ -0,0 +1,40 @@
+const { DataTypes, Model } = require('sequelize')
+
+module.exports = (sequelize) => {
+  class BookAuthor extends Model {
+    static removeByIds(authorId = null, bookId = null) {
+      const where = {}
+      if (authorId) where.authorId = authorId
+      if (bookId) where.bookId = bookId
+      return this.destroy({
+        where
+      })
+    }
+  }
+
+  BookAuthor.init({
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true
+    }
+  }, {
+    sequelize,
+    modelName: 'bookAuthor',
+    timestamps: false
+  })
+
+  // Super Many-to-Many
+  // ref: https://sequelize.org/docs/v6/advanced-association-concepts/advanced-many-to-many/#the-best-of-both-worlds-the-super-many-to-many-relationship
+  const { book, author } = sequelize.models
+  book.belongsToMany(author, { through: BookAuthor })
+  author.belongsToMany(book, { through: BookAuthor })
+
+  book.hasMany(BookAuthor)
+  BookAuthor.belongsTo(book)
+
+  author.hasMany(BookAuthor)
+  BookAuthor.belongsTo(author)
+
+  return BookAuthor
+}