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Which of the following correctly initiates a QueryBuilder for the Product entity in NestJS with TypeORM?

easy📝 Conceptual Q2 of 15
NestJS - Database with TypeORM
Which of the following correctly initiates a QueryBuilder for the Product entity in NestJS with TypeORM?
Athis.productRepository.buildQuery('product')
Bthis.productRepository.queryBuilder('product')
Cthis.productRepository.createQueryBuilder('product')
Dthis.productRepository.startQuery('product')
Step-by-Step Solution
Solution:
  1. Step 1: Recall the correct method

    The method to start a QueryBuilder is createQueryBuilder.
  2. Step 2: Verify method names

    Options B, C, and D are invalid method names in TypeORM repositories.
  3. Final Answer:

    this.productRepository.createQueryBuilder('product') -> Option C
  4. Quick Check:

    Use createQueryBuilder to start queries [OK]
Quick Trick: Use createQueryBuilder() to start building queries [OK]
Common Mistakes:
  • Using incorrect method names like queryBuilder or buildQuery
  • Confusing QueryBuilder initiation with other repository methods

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