define association:
Theme.belongsToMany(Product,{through:theme_product,foreignKey:"theme_id"})
Product.belongsToMany(Theme,{through:theme_product,foreignKey:"product_id"})theme_product is the intermediate table
error message:
throw new Error(this.name + ".belongsToMany called with something that\"snot a subclass of Sequelize.Model");
^
Error: Theme.belongsToMany called with something that"s not a subclass of Sequelize.Model problem has been resolved and the two models are not under the same sequelize instance.
refer to this project: https://codeshelper.com/a/11.
I realized it in this way. I don't know if it's helpful to you.
Wordbook is the relationship table between word (vocabulary list) and book (material list)
Wordbook.belongsTo (WordModel, {
foreignKey: "wordid",
constraints: false,
});
/ / BelongsTo association indicates that the foreign key of an one-to-many relationship exists in the source model.
Wordbook.belongsTo (BookModel, {
foreignKey: "bookid",
constraints: false,
});
problem description: there are three tables Table relationship description: the 1.category table holds the directory id and the name. The 2.category_product table stores the id,product_id of the category table corresponding to category_id and...