db: add base entity for common columns

Author: coder2000

packages/server/src/db/entities/author.entity.ts

@@ -1,12 +1,10 @@
-import { Column, Entity, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import { Column, Entity, OneToMany } from 'typeorm';
 
+import { BaseEntity } from './base.entity';
 import { PodcastEntity } from './podcast.entity';
 
 @Entity('author')
-export class AuthorEntity {
-  @PrimaryGeneratedColumn()
-  id: number;
-
+export class AuthorEntity extends BaseEntity {
   @Column()
   name: string;
 

packages/server/src/db/entities/base.entity.ts

@@ -0,0 +1,16 @@
+import {
+  CreateDateColumn,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+export abstract class BaseEntity {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}

packages/server/src/db/entities/category.entity.ts

@@ -1,17 +1,9 @@
-import {
-  Column,
-  Entity,
-  ManyToMany,
-  PrimaryGeneratedColumn,
-  JoinTable,
-} from 'typeorm';
+import { Column, Entity, ManyToMany, JoinTable } from 'typeorm';
+import { BaseEntity } from './base.entity';
 import { PodcastEntity } from './podcast.entity';
 
 @Entity('category')
-export class CategoryEntity {
-  @PrimaryGeneratedColumn()
-  id: number;
-
+export class CategoryEntity extends BaseEntity {
   @Column()
   name: string;
 

packages/server/src/db/entities/episode.entity.ts

@@ -1,11 +1,9 @@
 import { Column, Entity, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { BaseEntity } from './base.entity';
 import { PodcastEntity } from './podcast.entity';
 
 @Entity('episode')
-export class EpisodeEntity {
-  @PrimaryGeneratedColumn()
-  id: number;
-
+export class EpisodeEntity extends BaseEntity {
   @Column()
   title: string;
 

packages/server/src/db/entities/podcast.entity.ts

@@ -1,22 +1,11 @@
-import {
-  Column,
-  CreateDateColumn,
-  Entity,
-  ManyToMany,
-  ManyToOne,
-  OneToMany,
-  PrimaryGeneratedColumn,
-  UpdateDateColumn,
-} from 'typeorm';
+import { Column, Entity, ManyToMany, ManyToOne, OneToMany } from 'typeorm';
+import { BaseEntity } from './base.entity';
 import { AuthorEntity } from './author.entity';
 import { EpisodeEntity } from './episode.entity';
 import { CategoryEntity } from './category.entity';
 
 @Entity('podcast')
-export class PodcastEntity {
-  @PrimaryGeneratedColumn()
-  id: number;
-
+export class PodcastEntity extends BaseEntity {
   @Column()
   title: string;
 
@@ -44,12 +33,6 @@ export class PodcastEntity {
   @ManyToMany(() => CategoryEntity, (category) => category.podcasts)
   categories: CategoryEntity[];
 
-  @CreateDateColumn()
-  createdAt: Date;
-
-  @UpdateDateColumn()
-  updatedAt: Date;
-
   @Column({ nullable: true })
   authorId: number;
 }

packages/server/src/db/entities/queue.entity.ts

@@ -1,11 +1,11 @@
-import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
+import { Column, Entity } from 'typeorm';
 import { FilterableField } from '@nestjs-query/query-graphql';
 import { Field, ObjectType } from '@nestjs/graphql';
+import { BaseEntity } from './base.entity';
 
 @Entity('queue')
 @ObjectType('Queue')
-export class QueueEntity {
-  @PrimaryGeneratedColumn()
+export class QueueEntity extends BaseEntity {
   @FilterableField()
   id: number;
 

packages/server/src/db/migrations/1589291828794-AddBaseEntity.ts

@@ -0,0 +1,28 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class AddBaseEntity1589291828794 implements MigrationInterface {
+    name = 'AddBaseEntity1589291828794'
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "episode" ADD "createdAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "episode" ADD "updatedAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "category" ADD "createdAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "category" ADD "updatedAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "author" ADD "createdAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "author" ADD "updatedAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "queue" ADD "createdAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+        await queryRunner.query(`ALTER TABLE "queue" ADD "updatedAt" TIMESTAMP NOT NULL DEFAULT now()`, undefined);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "queue" DROP COLUMN "updatedAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "queue" DROP COLUMN "createdAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "author" DROP COLUMN "updatedAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "author" DROP COLUMN "createdAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "category" DROP COLUMN "updatedAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "category" DROP COLUMN "createdAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "episode" DROP COLUMN "updatedAt"`, undefined);
+        await queryRunner.query(`ALTER TABLE "episode" DROP COLUMN "createdAt"`, undefined);
+    }
+
+}