在typeorm中创建关系的正确方法是什么? [英] What is the correct way how to create relation in typeorm?

问题描述

我有两个实体:

@Entity({ name: 'provider' })
export class ProviderEntity extends GenericEntity {

    @Column()
    name: string;

    @Column()
    description: string;

    @OneToMany(() => ItemEntity, item => item.provider)
    items: Promise<ItemEntity[]>;

}

@Entity({ name: 'item' })
export class ItemEntity extends GenericEntity {

    @Column()
    content: string;

    @ManyToOne(() => ProviderEntity, provider => provider.items)
    provider: Promise<ProviderEntity>;

}

Provider 对象已经存在于数据库中，我想创建具有 provider 身份的 item .

Provider object already exist in database and I would like to create item with realtion to provider.

我的代码是:

        const content = 'mockContent';
        const providerId = '5be045b1-ef49-4818-b69f-a45c0b7e53';
       
        const item = new ItemEntity();
        item.content = content;
        item.provider = providerId; // ERROR

        await this.repository.save(item);
        return item;

它可以工作，但是我遇到打字稿错误.类型'string'无法分配给'Promise< ProviderEntity>'类型..正确的插入方式是什么?

The code it works, but I am getting an typescript error Type 'string' is not assignable to type 'Promise<ProviderEntity>'.. What is the correct way how to insert this?

通用实体类仅包含ID

Generic entity class contains only id

@PrimaryGeneratedColumn('uuid')
id: string;

推荐答案

我相信要通过关系ID(而不是完整的关系对象)来关联事物，您需要将关系ID添加到您的界面中:

I believe to associate things by a relation ID, and not a full relation object, you need to add the relation ID to your interface:

@ManyToOne(() => ProviderEntity, provider => provider.items)
provider: Promise<ProviderEntity>;

@Column()
providerId: string

providerId 是TypeORM用来在内部跟踪该关系的列，您只需要公开公开它即可.

providerId is the column TypeORM uses to keep track of the relation internally, you simply simply need to expose it publicly.

然后您只需设置该属性:

And then you simply set that property:

const item = new ItemEntity();
item.content = content;
item.providerId = providerId; // set providerId column directly.

await this.repository.save(item);

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