CODEWITHSUNDEEP
node.jstypescriptdependency-injectionnestjs
user1557092
user1557092

Reputation: 53

NestJS undefined dependencies

I'm using nestjs-i18n version 8.0.2 on my NestJS project to internationalize the strings. I have a class in one of my modules that has this constructor:

    constructor(
        @InjectRepository(UsersRepository)
        private readonly usersRepository: UsersRepository,
        private readonly apiService: ApiService,
        private readonly i18n: I18nRequestScopeService,
    ) {
    }

This is the full class:

@QueryHandler(MyQuery)
export class MyQueryHandler implements IQueryHandler<MyQuery> {

    constructor(
        @InjectRepository(UsersRepository)
        private readonly usersRepository: UsersRepository,
        private readonly apiService: ApiService,
        private readonly i18n: I18nRequestScopeService,
    ) {
    }

    async execute(query: MyQuery): Promise<MyResult> {
        ...
    }
}

QueryHandler is a decorator from the cqrs library @nestjs/cqrs version 6.1.0, if this can be of any help.

For some reason, my 3 dependencies are undefined if I try to inject I18nRequestScopeService as shown, but usersRepository and apiService are correctly defined if I remove the I18nRequestScopeService injection. No warnings or errors are shown on the log.

I have a custom ExceptionFilter with this constructor:

    constructor(private readonly i18n: I18nRequestScopeService) {
    }

and it works just fine.

In app.module.ts I have this:

@Module({
    imports: [
        ...
        I18nModule.forRoot({
            fallbackLanguage: 'en',
            parser: I18nJsonParser,
            parserOptions: {
                path: path.join(__dirname, 'i18n/'),
            },
            resolvers: [
                { use: QueryResolver, options: ['lang', 'locale', 'l'] },
                new HeaderResolver(['x-custom-lang']),
                AcceptLanguageResolver,
                new CookieResolver(['lang', 'locale', 'l']),
            ],
        })
    ],
    ...
})

I tried googling for the problem, but I had no luck. What am I missing?

Upvotes: 3

Views: 3013

Answers (1)

Jay McDoniel
Jay McDoniel

Reputation: 70061

Nest's implementation of CQRS does not allow for scoped providers. There is an open issue about it here

Upvotes: 1

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