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Question: Sequelize On DELETE, delete from junction table?
Time: Askeded 240 hours ago
Modified: Updated 47 minute ago
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Sequelize On DELETE, delete from junction table?

Sequelize is an Object-Relational Mapping (ORM) library for Node.js, which allows developers to interact with relational databases using JavaScript. When defining associations between models in Sequelize, you can specify the behavior for cascading deletes using the onDelete option.

When a model has a many-to-many association with another model, Sequelize automatically creates a junction table to store the associations between the two models. If you specify onDelete: 'CASCADE' for the association, Sequelize will automatically delete the associated rows in the junction table when a row in either of the associated tables is deleted.

Here’s an example of how to define a many-to-many association in Sequelize with cascading deletes:

javascript
const User = sequelize.define('user', {
  name: Sequelize.STRING
});

const Project = sequelize.define('project', {
  title: Sequelize.STRING
});

User.belongsToMany(Project, { through: 'UserProject', onDelete: 'CASCADE' });
Project.belongsToMany(User, { through: 'UserProject', onDelete: 'CASCADE' });

In this example, Sequelize will create a junction table named UserProject to store the associations between users and projects. When a user or project is deleted, Sequelize will automatically delete the associated rows in the UserProject table.

Note that if you don’t specify onDelete: 'CASCADE', Sequelize will not delete the associated rows in the junction table, and you’ll need to handle this yourself.

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