You want to update two related entities atomically in NestJS using TypeORM transactions. Which approach correctly ensures both updates succeed or fail together?

hard📝 Application Q15 of 15

NestJS - Database with TypeORM

async updateEntities(entityA, entityB) {
  await this.dataSource.transaction(async (manager) => {
    await manager.save(entityA);
    await manager.save(entityB);
  });
}

What is the best practice to handle errors and maintain data consistency?

AManually call rollback() inside the transaction callback on error

BSave entities without transactions and rely on database constraints

CUse separate transactions for each save to isolate failures

DWrap the transaction call in try-catch and handle rollback automatically

Step-by-Step Solution

Solution:

Step 1: Understand transaction error handling in TypeORM
TypeORM automatically rolls back if an error is thrown inside the transaction callback.
Step 2: Use try-catch outside transaction to handle errors
Wrapping the transaction call in try-catch lets you catch errors and respond without manual rollback calls.
Final Answer:
Wrap the transaction call in try-catch and handle rollback automatically -> Option D
Quick Check:
Try-catch outside transaction handles errors; rollback is automatic [OK]

Quick Trick: Use try-catch around transaction; rollback is automatic [OK]

Common Mistakes:

Trying to manually rollback inside transaction callback
Using separate transactions for related updates
Ignoring transactions and relying only on DB constraints

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More NestJS Quizzes

You want to update two related entities atomically in NestJS using TypeORM transactions. Which approach correctly ensures both updates succeed or fail together?

Step 1: Understand transaction error handling in TypeORM

Step 2: Use try-catch outside transaction to handle errors

Final Answer:

Quick Check:

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