[Solved] What happens if you forget to add TypeOrmModule.forFeature([Entity]) in a NestJS service module? — Ans: The service cannot inject the repository for that entity | NestJS

NestJS - Database with TypeORM

What happens if you forget to add TypeOrmModule.forFeature([Entity]) in a NestJS service module?

AThe database connection will fail to initialize

BThe application will crash on startup

CThe service cannot inject the repository for that entity

DThe entity will be automatically registered anyway

Step-by-Step Solution

Solution:

Step 1: Understand forFeature purpose
forFeature registers repositories for entities to be injected in services.
Step 2: Consequence of missing forFeature
Without it, repository injection fails, so service can't access DB for that entity.
Final Answer:
The service cannot inject the repository for that entity -> Option C
Quick Check:
Missing forFeature = no repository injection = B [OK]

Quick Trick: Use forFeature to inject repositories for entities [OK]

Common Mistakes:

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What happens if you forget to add TypeOrmModule.forFeature([Entity]) in a NestJS service module?