Implementing Many-to-One Relationships with NestJS and PostgreSQL

2023/08/21

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The article discusses the implementation of many-to-one relationships in SQL databases using NestJS and PostgreSQL. It highlights the importance of designing relationships and explains how a row from the first table can be connected to multiple rows in the second table, while a row from the second table can only connect to one row from the first table. The article introduces Kysely, a tool used for SQL migrations, and demonstrates how to add a non-nullable column with a default value to handle existing data. It also explains the difference between many-to-one and one-to-one relationships and provides code examples for creating articles with authors. Developers interested in working with NestJS and PostgreSQL will find this article helpful in understanding and implementing many-to-one relationships in their projects.