example.resolver.ts

// status argümanı boş gönderilirse null değil hi olmamış gibi query'e etki etmesi gerekirken null gidiyor. 
// conditional query ya da if if gibi bir yapı kuramadım.
@FieldResolver()
async okuduguKitaplar(
    @Args() { skip, take }: Pagination,
    @Arg('status', () => Int, { nullable: true }) readingStatus: number,
    @Root() user: User
): Promise<Book[]> {
    const userId = user.id;
    const relation = await this.bookReadingStatusRepository.find({ userId, readingStatus });
    if (relation.length === 0) { return []; }
    const ids = relation.map(r => r.bookId);
    return this.bookRepository.findByIds(ids);
}

example2.resolver.ts

    @FieldResolver()
    async okuduguKitaplar(
        @Args() { skip, take }: Pagination,
        @Arg('status', () => Int, { nullable: true }) readingStatus: number,
        @Root() user: User
    ): Promise<Book[]> {
        const userId = user.id;
        let relation = null;
        if (readingStatus) {
            relation = await this.bookReadingStatusRepository.find({ userId, readingStatus });
        }

        if (!readingStatus) {
            relation = await this.bookReadingStatusRepository.find({ userId });
        }

        if (relation.length === 0) { return []; }
        const ids = relation.map(r => r.bookId);
        return this.bookRepository.findByIds(ids);

    }

PARAMETERS: ["c0abe7b6-9c6d-45dc-b518-f29f55b97237",null]