Having difficulties incorporating a selected custom repository into a module

Issue with Dependency Injection in NestJS

Currently, I am working on implementing SOLID principles in my NestJS project by decoupling my service layer from TypeOrm. One of the benefits of this approach is the ability to switch between using an InMemoryRepository for testing and a TypeOrmRepository for production.

However, I have encountered a problem with injecting my custom TypeOrm repository as a provider. It seems that the @InjectRepository() decorator and TypeOrm are not behaving as expected in this specific scenario. Interestingly, I can inject my In Memory repositories without any issues in my unit tests.

[Nest] 12311   - 18/09/2021 at 06:22:43   [ExceptionHandler] Cannot read property 'save' of undefined
TypeError: Cannot read property 'save' of undefined
    at TypeOrmWorkoutRepository.Object.<anonymous>.Repository.save (/Users/arthurmehmetoglu/Development/CorpoSano/back/src/repository/Repository.ts:150:29)
    at WorkoutService.create (/Users/arthurmehmetoglu/Development/CorpoSano/back/src/workout/workout.service.ts:30:35)
    at WorkoutResolver.create (/Users/arthurmehmetoglu/Development/CorpoSano/back/src/workout/workout.resolver.ts:22:32)
   ...

For more information and code snippets, please refer to the sections below.

Code Samples

workout.module.ts

...

workout.service.ts

...

workout.service.spec.ts

...

workout-repository.interface.ts

...

in-memory-exercise.repository.ts

...

typeorm-workout.repository.ts

...

Environment

Nest version: 7.6.0

Node version: v14.16.1

Platform: Mac

Additional Resources:

Note: The provided code snippets have been condensed for clarity.

typescriptnestjstypeormsolid-principlesin-memory-database

Answer №1

After some troubleshooting, I managed to resolve the issue using the useExisting method as shown below:

 import { Module } from '@nestjs/common'
 import { getRepositoryToken, TypeOrmModule } from '@nestjs/typeorm'
 import { WorkoutResolver } from './workout.resolver'
 import { WorkoutService } from './workout.service'
 import { TypeOrmExerciseTemplateRepository } from '../exercise/repositories/type-orm-exercise-template.repository'
 import { TypeOrmWorkoutRepository } from './repositories/workout.typeorm.repository'
 import { TypeOrmExerciseRepository } from '../exercise/repositories/type-orm-exercise.repository'
 import { WORKOUT_REPOSITORY } from './repositories/workout.repository.interface'
 import { EXERCISE_TEMPLATE_REPOSITORY } from '../exercise/repositories/exercise-template-repository.interface'
 import { EXERCISE_REPOSITORY } from '../exercise/repositories/exercise-repository.interface'
 import { TypeOrmSessionRepository } from '../session/repositories/session.typeorm.repository'
 import { FillWorkoutWithExercisesUseCase } from './use-cases/fill-workout-with-exercises.use-case'
 
 @Module({
   imports: [
     TypeOrmModule.forFeature([
       TypeOrmExerciseTemplateRepository,
       TypeOrmExerciseRepository,
       TypeOrmWorkoutRepository,
       TypeOrmSessionRepository,
     ]),
   ],
   providers: [
     {
       provide: WORKOUT_REPOSITORY,
       useExisting: getRepositoryToken(TypeOrmWorkoutRepository),
     },
     {
       provide: EXERCISE_REPOSITORY,
       useExisting: getRepositoryToken(TypeOrmExerciseRepository),
     },
     {
       provide: EXERCISE_TEMPLATE_REPOSITORY,
       useExisting: getRepositoryToken(TypeOrmExerciseTemplateRepository),
     },
     WorkoutResolver,
     WorkoutService,
     FillWorkoutWithExercisesUseCase,
   ],
 })
 export class WorkoutModule {}

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