NestJS - Database with TypeORM
How can you combine the Repository pattern with Dependency Injection to swap database implementations in NestJS without changing service code?
How can you combine the Repository pattern with Dependency Injection to swap database implementations in NestJS without changing service code?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Dependency Injection benefits
DI allows swapping implementations by injecting different classes that follow the same interface.Step 2: Apply interface and tokens
Defining an interface for repository methods and injecting implementations via tokens lets you change database layers without modifying services.Final Answer:
Define an interface for repository methods and inject implementations via tokens -> Option DQuick Check:
Use interfaces and DI tokens to swap repositories [OK]
Quick Trick: Use interfaces and DI tokens to swap repository implementations [OK]
Common Mistakes:
- Hardcoding repository classes in services
- Using global variables for repositories
- Creating repositories in controllers
Master "Database with TypeORM" in NestJS
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