Question 1

How to set up a basic model in Sequelize with TypeScript?

Accepted Answer

Extend the Model class and define attributes using decorators or options. Use sequelize.sync() to create tables, but prefer migrations for production. The README links to getting started guides for versions 6 and 7.

Question 2

Sequelize vs Prisma: which is better for a new Node.js project?

Accepted Answer

Sequelize offers mature multi-database support and transactions, while Prisma provides better type safety and developer experience. Choose Sequelize if you need flexibility across SQL databases, Prisma for rapid development with PostgreSQL/MySQL.

Question 3

How to handle many-to-many associations in Sequelize?

Accepted Answer

Use the belongsToMany method on models with the through option for a junction table. Sequelize manages the intermediate model automatically, supporting additional attributes on the join table.

Question 4

Does Sequelize support database migrations and how to use them?

Accepted Answer

Yes, Sequelize has a CLI tool for migrations. Create migration files with up and down functions to manage schema changes version-controlled, as referenced in the tools section of the README.

Question 5

How to optimize Sequelize queries to avoid performance issues?

Accepted Answer

Use eager loading with include to reduce N+1 queries, add indexes, and enable query logging to inspect SQL. For complex cases, fall back to raw SQL with sequelize.query().

Question 6

What databases does Sequelize officially support?

Accepted Answer

Sequelize supports PostgreSQL, MySQL, MariaDB, SQLite, MS SQL Server, Snowflake, Oracle DB, DB2, and DB2 for IBM i, as listed in the README's key features.

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