Question

我正在尝试使用新的Loopback 4框架设置关系HasMany。我有以下模型：

import {Entity, model, property, belongsTo, hasMany} from 

'@loopback/repository';
import {User} from "./user.model";
import {OrderProduct} from "./order-product.model";

@model({
  name: 'sales_order'
})
export class Order extends Entity {
  @property({
    type: 'number',
    id: true,
    required: true,
  })
  id: number;

  @property({
    type: 'number',
    required: true,
  })
  total_amount: number;

  @belongsTo(() => User)
  user_id: number;

  @hasMany(() => OrderProduct, {keyTo: 'order_id'})
  products?: OrderProduct[];

  constructor(data?: Partial<Order>) {
    super(data);
  }
}

存储库如下：

import {DefaultCrudRepository, repository, HasManyRepositoryFactory, BelongsToAccessor} from '@loopback/repository';
import {Order, OrderProduct, User} from '../models';
import {DbDataSource} from '../datasources';
import {inject, Getter} from '@loopback/core';
import {OrderProductRepository} from "./order-product.repository";
import {UserRepository} from "./user.repository";

export class OrderRepository extends DefaultCrudRepository<
  Order,
  typeof Order.prototype.id
> {

  public readonly user: BelongsToAccessor<
      User,
      typeof Order.prototype.id
    >;

  public readonly products: HasManyRepositoryFactory<
      OrderProduct,
      typeof Order.prototype.id
  >;

  constructor(
    @inject('datasources.db') dataSource: DbDataSource,
    @repository.getter(OrderProductRepository)
        getOrderProductRepository: Getter<OrderProductRepository>,
    @repository.getter('UserRepository')
        userRepositoryGetter: Getter<UserRepository>,
  ) {
    super(Order, dataSource);

    this.products = this._createHasManyRepositoryFactoryFor(
        'products',
        getOrderProductRepository,
    );

    this.user = this._createBelongsToAccessorFor(
        'user_id',
        userRepositoryGetter,
    );
  }
}

例如，当我接受订单时，出现错误：500 error: column "products" does not exist，并且在进行更多挖掘时，我看到SQL正在尝试检索字段products所在的位置只是一种关系。有人知道我做错了什么吗？我正在使用pg作为数据库。

Answer 1

我相信这是LoopBack 4中的错误。当您用@hasMany装饰类属性时，装饰器在后台定义了模型属性。参见here：

export function hasMany<T extends Entity>(
  targetResolver: EntityResolver<T>,
  definition?: Partial<HasManyDefinition>,
) {
  return function(decoratedTarget: Object, key: string) {
    property.array(targetResolver)(decoratedTarget, key);

    // ...
  };
}

当连接器查询数据库时，它试图在查询中包括列products，因为它认为products是属性。

https://github.com/strongloop/loopback-next/issues/1909已跟踪了该问题，请考虑对问题进行投票并加入讨论。

回送4-字段中包含HasMany关系

1 个答案: