Error importing service with a mongoose model dependency

[boreal hare]

I'm trying to import UserService into AuthService but I get this error:

Nest can't resolve dependencies of the UserService (?). Please make sure that the argument UserModel at index [0] is available in the AuthModule context.

Potential solutions:
- Is AuthModule a valid NestJS module?
- If UserModel is a provider, is it part of the current AuthModule?
- If UserModel is exported from a separate @Module, is that module imported within AuthModule?
  @Module({
    imports: [ /* the Module containing UserModel */ ]
  })

Minimum reproduction repository:
https://github.com/Krak798/nest-mongoose-model-import-error

How can I solve this problem?

[sullen minnow]

You are importing userService, but userService injects something in your case it is mongodb injectable.

you have several options

First options its moving mongodb module into module that contains both modules auth and user. And use forRoot method of MongooseModule.

Second is import UserModule in AuthModule and export userService in export array of UserModule

[boreal hare]

Thanks for replying. But I tried that too.

auth.module.ts

@Module({
  controllers: [AuthController],
  providers: [AuthService, UserService],
  imports: [JwtModule, UserModule],
})
export class AuthModule {}

user.module.ts

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: User.name,
        schema: UserSchema,
      },
    ]),
  ],
  providers: [UserService],
  controllers: [UserController],
  exports: [UserService],
})
export class UserModule {}

And the error is still the same.

I will provide a minimum reproduction repository soon.

[boreal hare]

https://github.com/Krak798/nest-mongoose-model-import-error

Importing the MongooseModule with the UserSchema into AuthModule works, but I don't know if that's the expected behaviour.

[analog ingot]

@InjectModel(User.name) private userModel: Model<User> should change <User> to <UserDocument>

[boreal hare]

Doesn't change anything. But in the docs is:

constructor(@InjectModel(Cat.name) private catModel: Model<Cat>) {}

Not CatDocument, but Cat only.

[plush flare]

since the UserService is already exported from the UserModule, you don't need to register it as a provider again in the AuthModule

@Module({
  controllers: [AuthController],
- providers: [AuthService, UserService],
+ providers: [AuthService],
  imports: [JwtModule, UserModule],
})
export class AuthModule {}

AuthModule is trying to find the dependencies of the UserService, and that is where the error is originating from