Question

尝试创建电子商务 API。在创建 API 时，我有一条添加产品的途径。我有一个具有一种关系的普通东西的产品实体：

 @Entity('products')
export class productsEntity extends BaseEntity{
    @PrimaryGeneratedColumn()
    id: number;

    @ManyToMany(() => category, categoryEntity => categoryEntity.products, {cascade: true})
    @JoinTable({name: 'product_category'})
    categories: category[];

    ....//other columns
}

另一方面，类别实体看起来像：

    @Entity('categories')
    export class category extends BaseEntity{
    @PrimaryGeneratedColumn()
    id: number;

    @Column({nullable: false, default: 'all', unique: true})
    title: string;

    @ManyToMany(()=> productsEntity, product => product.categories)
    products: productsEntity[];
}

现在，当我尝试使用以下代码保存它时：

@EntityRepository(productsEntity)
export class productsRepository extends Repository<productsEntity> {
    
    private logger = new Logger();

    async addProduct(productDetails, username){
        const {title, description, belongsTo, price, units}  = productDetails;
        try{
            let newProduct = new productsEntity();
            newProduct.title = title;
            newProduct.description = description;
            newProduct.price = price;
            newProduct.units = units;
            newProduct.soldBy = username;
            newProduct.categories = belongsTo;
            await this.manager.save( newProduct );
        }
        catch(err){
            this.logger.error(err.message);
            throw new HttpException('Failed adding Product.', HttpStatus.INTERNAL_SERVER_ERROR)
        }
    }
}

虽然我能够保存表中不存在的产品类别字段，但中间表也没有值。并且有这样的形状。

ecommerceapi=# SELECT * FROM product_category;

见

 productsId | categoriesId
------------+--------------
(0 rows)

在typeorm中使用存储库时我们如何保存关系

0 个答案: