How do I manage relationships in Node.js using ORM?

How do I manage relationships in Node.js using ORM?

You can manage relationships in Node.js using ORM by defining associations between models. For example, in Sequelize, you can use methods like hasMany, belongsTo, and belongsToMany.

Can you give me an example of a one-to-many relationship?

Sure! In Sequelize, you can define a one-to-many relationship like this: User.hasMany(Post) and Post.belongsTo(User). This means one user can have many posts.

What about many-to-many relationships?

For many-to-many relationships, you can use a junction table. For example, User.belongsToMany(Role, { through: 'UserRoles' }) and Role.belongsToMany(User, { through: 'UserRoles' }).

How do I query these relationships?

You can use methods like include in your queries. For example, User.findAll({ include: Post }) will fetch users along with their posts.