3 路多对多类型Orm

Question

有没有办法在 typeOrm 中实现 3 向多对多关系

3 向多对多关系的示例如下

3 way many-to-many relationship

Answer 1

我找到了解决方案；它实际上写在typorm的文档中 https://github.com/typeorm/typeorm/blob/master/docs/many-to-many-relations.md#many-to-many-relations-with-custom-properties

与自定义属性的多对多关系如果您需要为多对多关系添加额外的属性，您必须自己创建一个新实体。例如，如果您希望实体 Post 和 Category 与其他订单列具有多对多关系，则需要创建实体 PostToCategory，其中包含指向两个方向和自定义列的两个 ManyToOne 关系其中：

import { Entity, Column, ManyToOne, PrimaryGeneratedColumn } from "typeorm";
import { Post } from "./post";
import { Category } from "./category";

@Entity()
export class PostToCategory {
@PrimaryGeneratedColumn()
public postToCategoryId!: number;

@Column()
public postId!: number;

@Column()
public categoryId!: number;

@Column()
public order!: number;

@ManyToOne(type => Post, post => post.postToCategories)
public post!: Post;

@ManyToOne(type => Category, category => category.postToCategories)
public category!: Category;
}

此外，您还必须将如下关系添加到 Post 和类别：

// category.ts
...
@OneToMany(type => PostToCategory, postToCategory => postToCategory.category)
public postToCategories!: PostToCategory[];

// post.ts
...
@OneToMany(type => PostToCategory, postToCategory => postToCategory.post)
public postToCategories!: PostToCategory[];

3 路多对多类型Orm

3 way many-to-many typeOrm

many-to-many

relationship

typescript

typeorm

nestjs