Troubleshooting Problem with GraphQL and TypeORM: Retrieving Products Along with Their Images

Currently, I am developing a GraphQL API that utilizes TypeORM as the ORM to communicate with my PostgreSQL database. One of the challenges I am facing involves fetching products along with their corresponding images through GraphQL queries.

In this scenario, there are two tables: products and images. Each product is linked to multiple images stored in the images table via a foreign key called product_id, which references the id column in the products table.

Below is a simplified version of my GraphQL and TypeORM setup:

  1. Product Entity:
@Entity()
export class Product extends BaseEntity {
  @PrimaryGeneratedColumn()
  id!: number;

  // Other columns...

  @OneToMany(() => ProductImage, (image) => image.product)
  images: ProductImage[];
}
  1. ProductImage Entity:
@Entity()
export class ProductImage extends BaseEntity {
  @PrimaryGeneratedColumn()
  id!: number;

  @Column()
  url!: string;

  @Column()
  productId!: number;
  @ManyToOne(() => Product, (product) => product.images)
  product: Product;
}
  1. GraphQL Query:
extendType({
  type: 'Product',
  definition(t) {
    t.field('images', {
      type: 'ProductImage',
      list: true,
      resolve(parent, _args, _context, _info): Promise<ProductImage[] | null> {
        // Issue: The images are not being fetched correctly for the product.
        return ProductImage.find({ where: { productId: parent.id } });
      },
    });
  },
});

The challenge lies in the fact that when attempting to retrieve products with their images using the GraphQL query, the expected results are not achieved. The images field returns null, and the root cause of this issue remains unclear.

Is there something missing from either my GraphQL query or TypeORM configuration? Are there alternative methods to retrieve products and their associated images efficiently through GraphQL and TypeORM?

Your insights and assistance regarding this matter would be highly valuable. Thank you!

Answer №1

t.valid.list.isNotNull.field to precisely depict the connection between items and their corresponding visuals.

  category: 'Product',
  specification(t) {
    t.nonNull.list.nonNull.field('visuals', {
      category: 'VisualRepresentation',
      resolve(main, _arguments, _environment, info): Promise<VisualRepresentation[] | null> {
        // Ensure that a non-null list of non-null components is returned
        return VisualRepresentation.find({ location: { itemId': main.id } });
      },
    });
  },
});

Through the use of t.nonNull.list.nonNull.field, we guarantee that the visuals field will consistently provide a non-null array of non-null components, accurately illustrating the link between items and visuals.

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