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yarn add @nestjs/serve-static

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// 생략
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@Module({
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  imports: [
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    PostsModule,
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    /***
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     * http://localhost:3000/public/posts/4022.jpg
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     * http://localhost:3000/posts/4022.jpg
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     */
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    ServeStaticModule.forRoot({
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      rootPath: PUBLIC_FOLDER_PATH,
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      serveRoot: '/public',
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    }),
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    // 생략
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  ],
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  // 생략
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})
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export class AppModule {}

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// posts.entity.ts 생략
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@Column({
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  nullable: true,
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})
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@Transform(({ value }) => value && `/${join(POST_PUBLIC_IMAGE_PATH, value)}`)
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image?: string