add relations

src/modules/content/entities/CategoryEntity.ts

@@ -1,4 +1,6 @@
-import { Column, Entity, PrimaryColumn } from 'typeorm';
+import { Column, Entity, OneToMany, PrimaryColumn, Relation } from 'typeorm';
+
+import { PostEntity } from '@/modules/content/entities/post.entity';
 
 @Entity('content_category')
 export class CategoryEntity {
@@ -10,4 +12,7 @@ export class CategoryEntity {
 
     @Column({ comment: '分类排序', default: 0 })
     customOrder: number;
+
+    @OneToMany(() => PostEntity, (post) => post.category, { cascade: true })
+    posts: Relation<PostEntity[]>;
 }

src/modules/content/entities/comment.entity.ts

@@ -1,4 +1,6 @@
-import { Column, CreateDateColumn, Entity, PrimaryColumn } from 'typeorm';
+import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryColumn, Relation } from 'typeorm';
+
+import { PostEntity } from '@/modules/content/entities/post.entity';
 
 @Entity('content_comment')
 export class CommentEntity {
@@ -10,4 +12,11 @@ export class CommentEntity {
 
     @CreateDateColumn({ comment: '创建时间' })
     createdAt: Date;
+
+    @ManyToOne(() => PostEntity, (post) => post.comments, {
+        nullable: false,
+        onDelete: 'CASCADE',
+        onUpdate: 'CASCADE',
+    })
+    post: Relation<PostEntity>;
 }

src/modules/content/entities/post.entity.ts

@@ -4,11 +4,18 @@ import {
     Column,
     CreateDateColumn,
     Entity,
+    JoinTable,
+    ManyToMany,
+    OneToMany,
     PrimaryColumn,
+    Relation,
     UpdateDateColumn,
 } from 'typeorm';
 
 import { PostBodyType } from '@/modules/content/constants';
+import { CategoryEntity } from '@/modules/content/entities/CategoryEntity';
+import { CommentEntity } from '@/modules/content/entities/comment.entity';
+import { TagEntity } from '@/modules/content/entities/tag.entity';
 
 @Exclude()
 @Entity('content_posts')
@@ -55,4 +62,19 @@ export class PostEntity extends BaseEntity {
     @Type(() => Date)
     @UpdateDateColumn({ comment: '更新时间', nullable: true })
     updatedAt?: Date;
+
+    @Expose()
+    @OneToMany(() => 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[]>;
 }

src/modules/content/entities/tag.entity.ts

@@ -1,4 +1,7 @@
-import { Column, Entity, PrimaryColumn } from 'typeorm';
+import { Expose } from 'class-transformer';
+import { Column, Entity, ManyToMany, PrimaryColumn, Relation } from 'typeorm';
+
+import { PostEntity } from '@/modules/content/entities/post.entity';
 
 @Entity('content_tag')
 export class TagEntity {
@@ -10,4 +13,8 @@ export class TagEntity {
 
     @Column({ comment: '标签描述', nullable: true })
     desc?: string;
+
+    @Expose()
+    @ManyToMany(() => PostEntity, (post) => post.tags)
+    posts: Relation<PostEntity[]>;
 }