typeorm

Guide TypeORM implementation for database management in NestJS applications.

Updated Feb 10, 2026

Search Tags:#database #migrations #repository #orm #nestjs #typeorm #querybuilder

Ready to run

npx skills add https://github.com/0r0loo/my-claude-code-toolkit --skill typeorm-0r0loo

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: typeorm
Source: https://github.com/0r0loo/my-claude-code-toolkit/tree/main/.claude/skills/TypeORM
Command: npx skills add https://github.com/0r0loo/my-claude-code-toolkit --skill typeorm-0r0loo

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides comprehensive guidance on using TypeORM effectively within NestJS applications, ensuring consistent and efficient database operations.

Core Features & Use Cases

Entity Definition: Best practices for defining entities, columns, and relations.
Repository Pattern: Implementing custom repositories for complex queries.
QueryBuilder: Advanced querying techniques, JOINs, and subqueries.
Migrations & Transactions: Managing database schema changes and ensuring data integrity.
Use Case: Define a new Product entity with relations to Category and Supplier, implement a custom repository to find products by multiple criteria, and set up a migration to add a new price column.

Quick Start

Use the typeorm skill to define a new User entity with an email column and a unique index.

Frequently Asked Questions about typeorm

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I set up database entities and relations in a NestJS application?▼

To set up database entities in NestJS, you define classes with column decorators and map relations between them. This approach ensures structured data management, allowing you to link objects like Product and Category efficiently.

What is the best way to write complex queries with TypeORM in NestJS?▼

The best way to write complex queries is using the QueryBuilder. It allows you to construct advanced SQL queries, perform JOINs, and execute subqueries while maintaining type safety within your NestJS repository pattern.

How do I manage database schema changes and migrations in NestJS?▼

You manage database schema changes by implementing migrations. This process handles schema evolution safely, ensuring your database structure updates alongside your application code without risking data integrity.

Why should I avoid synchronize true in production with TypeORM?▼

You should avoid synchronize true in production because it automatically alters your database schema based on entity changes, which can cause severe data loss. Instead, use migrations to control schema evolution safely.

Can I implement custom repositories for finding data by multiple criteria in TypeORM?▼

Yes, you can implement custom repositories to find data by multiple criteria. This pattern encapsulates complex query logic, keeping your service layer clean and maintaining reusable database interaction methods.

How does transaction management work for data integrity in NestJS?▼

Transaction management ensures data integrity by grouping multiple database operations into a single atomic unit. If any operation fails, the entire transaction rolls back, preventing partial updates and maintaining consistent database state.