Typeorm how to use relations in findOne()

Question

I am using TypeORM for the first time and I got stuck trying to get an entry from another table using a FK. But I get this Error.

Error: Relation "ingredientCategoryId" was not found; please check if it is correct and really exists in your entity.

ingredient.entity

@Entity('ingredient')
export class IngredientEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ nullable: false })
  ingredientCategoryId: number;

  @ManyToOne(
    () => IngredientsCategoryEntity,
    (ingredientsCategory) => ingredientsCategory.ingredient,
    { eager: true },
  )
  @JoinColumn({ name: 'ingredientCategoryId', referencedColumnName: 'id' })
  ingredientsCategory: IngredientsCategoryEntity;
}

ingredientsCategory.entity

@Entity('ingredientsCategory')
export class IngredientsCategoryEntity {
  @PrimaryGeneratedColumn()
  id: number;

  @OneToMany(
    () => IngredientEntity,
    (ingredient) => ingredient.ingredientsCategory,
  )
  ingredient: IngredientEntity[];
}

ingredient.service

  async getIngredientCategory(id: number): Promise<any> {
    const ingredient: IngredientEntity = await this.repo.findOne({
      where: { id: id },
      relations: ['ingredientCategoryId'],
    });
    return ingredient.ingredientsCategory;
  }

ingredientsCategory.controller

  @Get('/:id/ingredientsCategoryList')
  async getCategory(@Param('id', ParseIntPipe) id: number) {
    return this.ingredientService.getIngredientCategory(id);
  }

Answer 1

Try this:

relations: ['ingredientsCategory'],

instead of:

relations: ['ingredientCategoryId'],