【第六章】数据关联与树形嵌套｜提问

hang

【第六章】数据关联与树形嵌套
http://localhost:3333/courses/nestjs/chapter6
![[upl-image-preview uuid=36ca1493-bb69-46d6-8b0e-3d44410b5d98 url=https://cn-nb1.rains3.com/3rcd/2024-01-31/1706680604-84153-image.png fullscreen_uri={URL}]
](https://)
在进行模型编写后，再启动项目，一直显示错误。

[upl-image-preview uuid=09d83b00-3faa-42d7-96c1-88b754a965b1 url=https://cn-nb1.rains3.com/3rcd/2024-01-31/1706680668-974787-image.png fullscreen_uri={URL}]

目前尝试的方法有pnpm rebuild，无效。也去stack over flow找过问题，但是似乎不想关。

import { Expose } from "class-transformer";
import { Entity, 
        BaseEntity, 
        PrimaryColumn, 
        Column, 
        CreateDateColumn, 
        UpdateDateColumn, 
        ManyToOne, 
        Relation,
        JoinTable, 
        ManyToMany, 
        OneToMany} from "typeorm";
import { PostBodyType } from "../constants";
import { CategoryEntity } from "./category.entity";
import { CommentEntity } from "./comment.entity";
import { TagEntity } from "./tag.entity";

// src/modules/content/entities/post.entity.ts
@Entity('content_posts')
export class PostEntity extends BaseEntity {
    @Expose()
    @PrimaryColumn({ type: 'varchar', generated: 'uuid', length: 36 })
    id: string;

    @Expose()
    @Column({ comment: '文章标题' })
    title: string;

    @Expose({ groups: ['post-detail'] })
    @Column({ comment: '文章内容', type: 'text' })
    body: string;

    @Expose()
    @Column({ comment: '文章描述', nullable: true })
    summary?: string;

    @Expose()
    @Column({ comment: '关键字', type: 'simple-array', nullable: true })
    keywords?: string[];

    @Expose()
    @Column({
        comment: '文章类型',
        type: 'varchar',
        // 如果是mysql或者postgresql你可以使用enum类型
        // enum: PostBodyType,
        default: PostBodyType.MD,
    })
    type: PostBodyType;

    @Expose()
    @Column({
        comment: '发布时间',
        type: 'varchar',
        nullable: true,
    })
    publishedAt?: Date | null;

    @Expose()
    @Column({ comment: '自定义文章排序', default: 0 })
    customOrder: number;

    @Expose()
    @CreateDateColumn({
        comment: '创建时间',
    })
    createdAt: Date;

    @Expose()
    @UpdateDateColumn({
        comment: '更新时间',
    })
    updatedAt: Date;

    @Expose()
    @ManyToOne(() => CategoryEntity, (category) => category.posts, {
        nullable: true,
        onDelete: 'SET NULL',
    })
    category: Relation<CategoryEntity>;

    @Expose()
    @ManyToMany(() => TagEntity, (tag) => tag.posts, {
        cascade: true,
    })
    @JoinTable()
    tags: Relation<TagEntity>[];

    @OneToMany(() => CommentEntity, (comment) => comment.post, {
        cascade: true,
    })
    comments: Relation<CommentEntity>[];
}

import { Entity, BaseEntity, PrimaryColumn, Column, OneToMany, Relation } from "typeorm";
import { PostEntity } from "./post.entity";


@Entity('content_categories')
export class CategoryEntity extends BaseEntity {
    @PrimaryColumn({ type: 'varchar', generated: 'uuid', length: 36 })
    id: string;

    @Column({ comment: '分类名称' })
    name: string;

    @Column({ comment: '分类排序', default: 0 })
    customOrder: number;

    @OneToMany(() => PostEntity, (post) => post.category, {
        cascade: true,
    })
    posts: Relation<PostEntity[]>;
}

配置如下：
[upl-image-preview uuid=07d5b199-14f6-4427-92b7-f8a0ed81a9d2 url=https://cn-nb1.rains3.com/3rcd/2024-01-31/1706680859-236514-image.png fullscreen_uri={URL}]
[upl-image-preview uuid=ce0009f9-2eed-4d2d-b9cb-4ff56d9e6005 url=https://cn-nb1.rains3.com/3rcd/2024-01-31/1706680904-14224-image.png fullscreen_uri={URL}]

求问下，可能是什么问题，导致框架无法检测到实体的原数据？
@Cloneable

Cloneable

hang 看下是不是在 ContentModule 中没有在 imports 中通过 TypeOrmModule.forFeature(Object.values(entities))（参考 https://git.3rcd.com/classroom/courses/src/branch/main/data/docs/nestjs/chapter4.md?display=source#L1875）处理 CategoryEntity，或者在 entities/index.ts 没有导出 CategoryEntity。

如果都不是上述问题引起的，你把本地代码项目提交一下仓库（提交到自己的 Github 即可），然后附个链接地址，我有空的时候排查一下。

hang

问题解决，检查没注意到这个问题。
[upl-image-preview uuid=c5d6bcc8-77e0-46cc-b6ab-f83546e4a6b4 url=https://cn-nb1.rains3.com/3rcd/2024-02-02/1706841731-734335-image.png fullscreen_uri={URL}]