diff --git a/nestjs-mongoose/src/common/pagination/pagination.dto.ts b/nestjs-mongoose/src/common/pagination/pagination.dto.ts
index c6f4fca..5709ef1 100644
--- a/nestjs-mongoose/src/common/pagination/pagination.dto.ts
+++ b/nestjs-mongoose/src/common/pagination/pagination.dto.ts
@@ -1,5 +1,10 @@
 import { IsInt, IsOptional, Min } from 'class-validator';
-import { ClassConstructor, ClassTransformOptions, Expose, plainToClass } from '@nestjs/class-transformer';
+import {
+  ClassConstructor,
+  ClassTransformOptions,
+  Expose,
+  plainToClass,
+} from '@nestjs/class-transformer';
 import { Type } from 'class-transformer';
 import { ApiPropertyOptional } from '@nestjs/swagger';
 
@@ -26,7 +31,6 @@ export class PaginationParamsDto {
 }
 
 export class DataWithPaginationDto<T> {
-
   @Expose()
   data: T[];
 
@@ -38,8 +42,11 @@ export class DataWithPaginationDto<T> {
   };
 }
 
-export function transformPlainToDataWithPaginationDto<T>(cls: ClassConstructor<T>,
-  plain: DataWithPaginationDto<T>, options?: ClassTransformOptions): DataWithPaginationDto<T> {
+export function transformPlainToDataWithPaginationDto<T>(
+  cls: ClassConstructor<T>,
+  plain: DataWithPaginationDto<T>,
+  options?: ClassTransformOptions,
+): DataWithPaginationDto<T> {
   const { data, meta } = plain;
   const transformedData = data.map((item) => {
     return plainToClass(cls, item, options);
diff --git a/nestjs-mongoose/src/common/pagination/transform-pagination-response.decorator.ts b/nestjs-mongoose/src/common/pagination/transform-pagination-response.decorator.ts
index 3a99620..e6b5992 100644
--- a/nestjs-mongoose/src/common/pagination/transform-pagination-response.decorator.ts
+++ b/nestjs-mongoose/src/common/pagination/transform-pagination-response.decorator.ts
@@ -1,18 +1,19 @@
-import { ClassConstructor, ClassTransformer, ClassTransformOptions } from "@nestjs/class-transformer";
-import { transformPlainToDataWithPaginationDto } from "./pagination.dto";
+import {
+  ClassConstructor,
+  ClassTransformOptions,
+} from '@nestjs/class-transformer';
+import { transformPlainToDataWithPaginationDto } from './pagination.dto';
 
 export function TransformPaginationResponse(
   classType: ClassConstructor<any>,
-  params?: ClassTransformOptions
+  params?: ClassTransformOptions,
 ): MethodDecorator {
   return function (
     target: Record<string, any>,
-    propertyKey: string | Symbol,
-    descriptor: PropertyDescriptor
+    propertyKey: string | symbol,
+    descriptor: PropertyDescriptor,
   ): void {
-    const classTransformer: ClassTransformer = new ClassTransformer();
     const originalMethod = descriptor.value;
-
     descriptor.value = function (...args: any[]): Record<string, any> {
       const result: any = originalMethod.apply(this, args);
       const isPromise =
@@ -21,10 +22,9 @@ export function TransformPaginationResponse(
         typeof result.then === 'function';
       return isPromise
         ? result.then((data: any) =>
-          transformPlainToDataWithPaginationDto(classType, data, params)
-        )
+            transformPlainToDataWithPaginationDto(classType, data, params),
+          )
         : transformPlainToDataWithPaginationDto(classType, result, params);
     };
   };
 }
-
diff --git a/nestjs-mongoose/src/posts/dto/create-posts.dto.ts b/nestjs-mongoose/src/posts/dto/create-posts.dto.ts
deleted file mode 100644
index dc3183d..0000000
--- a/nestjs-mongoose/src/posts/dto/create-posts.dto.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { IsString, IsNotEmpty } from 'class-validator';
-
-export class CreatePostsDto {
-  @IsString()
-  @IsNotEmpty()
-  title: string;
-
-  @IsString()
-  @IsNotEmpty()
-  content: string;
-}
-
-export default CreatePostsDto;
diff --git a/nestjs-mongoose/src/posts/dto/create-update-posts.dto.ts b/nestjs-mongoose/src/posts/dto/create-update-posts.dto.ts
new file mode 100644
index 0000000..ec04857
--- /dev/null
+++ b/nestjs-mongoose/src/posts/dto/create-update-posts.dto.ts
@@ -0,0 +1,26 @@
+import { IsOptional, IsString, IsNotEmpty } from 'class-validator';
+
+interface PostDto {
+  title: string;
+  content: string;
+}
+
+export class UpdatePostDto implements PostDto {
+  @IsString()
+  @IsOptional()
+  title: string;
+
+  @IsString()
+  @IsOptional()
+  content: string;
+}
+
+export class CreatePostDto implements PostDto {
+  @IsString()
+  @IsNotEmpty()
+  title: string;
+
+  @IsString()
+  @IsNotEmpty()
+  content: string;
+}
diff --git a/nestjs-mongoose/src/posts/dto/posts.dto.ts b/nestjs-mongoose/src/posts/dto/posts.dto.ts
index dafd7c7..4513a73 100644
--- a/nestjs-mongoose/src/posts/dto/posts.dto.ts
+++ b/nestjs-mongoose/src/posts/dto/posts.dto.ts
@@ -1,5 +1,5 @@
 import { Expose, Transform } from '@nestjs/class-transformer';
-import { DataWithPaginationDto, PaginationParamsDto } from '../../common/pagination/pagination.dto';
+import { PaginationParamsDto } from '../../common/pagination/pagination.dto';
 
 export class PostsDto {
   @Expose()
@@ -20,5 +20,3 @@ export class PostsDto {
 }
 
 export class GetPostsDto extends PaginationParamsDto { }
-
-export class GetPostsResponseDto extends DataWithPaginationDto<PostsDto> { }
diff --git a/nestjs-mongoose/src/posts/dto/update-post.dto.ts b/nestjs-mongoose/src/posts/dto/update-post.dto.ts
deleted file mode 100644
index 55d9b88..0000000
--- a/nestjs-mongoose/src/posts/dto/update-post.dto.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import { IsOptional, IsString } from 'class-validator';
-
-export class UpdatePostDto {
-  @IsString()
-  @IsOptional()
-  title: string;
-
-  @IsString()
-  @IsOptional()
-  content: string;
-}
-
-export default UpdatePostDto;
diff --git a/nestjs-mongoose/src/posts/dto/update-posts.dto.ts b/nestjs-mongoose/src/posts/dto/update-posts.dto.ts
deleted file mode 100644
index 1313971..0000000
--- a/nestjs-mongoose/src/posts/dto/update-posts.dto.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import { Expose, Transform, Exclude } from '@nestjs/class-transformer';
-
-export class UpdatePostsDto {
-  @Exclude()
-  id: string;
-
-  @Expose()
-  title: string;
-
-  @Expose()
-  @Transform(({ value }) => value || 'No-content')
-  content: string;
-
-  @Expose()
-  createdAt: Date;
-}
diff --git a/nestjs-mongoose/src/posts/posts.controller.ts b/nestjs-mongoose/src/posts/posts.controller.ts
index 25250c0..f6fea9b 100644
--- a/nestjs-mongoose/src/posts/posts.controller.ts
+++ b/nestjs-mongoose/src/posts/posts.controller.ts
@@ -11,10 +11,8 @@ import {
   Put,
   Query,
 } from '@nestjs/common';
-import CreatePostsDto from './dto/create-posts.dto';
 import ParamsWithId from '../utils/paramsWithId';
-import UpdatePostDto from './dto/update-post.dto';
-import { UpdatePostsDto } from './dto/update-posts.dto';
+import { UpdatePostDto, CreatePostDto } from './dto/create-update-posts.dto';
 import { TransformPlainToClass } from '@nestjs/class-transformer';
 import { GetPostsDto, PostsDto } from './dto/posts.dto';
 import { ApiBody, ApiTags } from '@nestjs/swagger';
@@ -41,10 +39,10 @@ export default class PostsController {
   }
 
   @Post()
-  @ApiBody({ type: CreatePostsDto })
+  @ApiBody({ type: CreatePostDto })
   @ApiBody(swaggerConfig.body)
   @TransformPlainToClass(PostsDto, { excludeExtraneousValues: true })
-  async createPost(@Body() post: CreatePostsDto) {
+  async createPost(@Body() post: CreatePostDto) {
     return this.postsService.create(post);
   }
 
@@ -57,18 +55,15 @@ export default class PostsController {
   @swaggerConfig.param.id
   @ApiBody(swaggerConfig.body)
   @Put(':id')
-  @TransformPlainToClass(UpdatePostsDto, { excludeExtraneousValues: true })
-  async updatePost(
-    @Param() { id }: ParamsWithId,
-    @Body() post: CreatePostsDto,
-  ) {
+  @TransformPlainToClass(PostsDto, { excludeExtraneousValues: true })
+  async updatePost(@Param() { id }: ParamsWithId, @Body() post: CreatePostDto) {
     return this.postsService.update(id, post);
   }
 
   @swaggerConfig.param.id
   @ApiBody(swaggerConfig.body)
   @Patch(':id')
-  @TransformPlainToClass(UpdatePostsDto, { excludeExtraneousValues: true })
+  @TransformPlainToClass(PostsDto, { excludeExtraneousValues: true })
   async partialUpdatePost(
     @Param() { id }: ParamsWithId,
     @Body() post: UpdatePostDto,
diff --git a/nestjs-mongoose/src/posts/posts.service.ts b/nestjs-mongoose/src/posts/posts.service.ts
index e02eeab..359080a 100644
--- a/nestjs-mongoose/src/posts/posts.service.ts
+++ b/nestjs-mongoose/src/posts/posts.service.ts
@@ -1,14 +1,14 @@
 import { Model } from 'mongoose';
 import { Injectable, NotFoundException } from '@nestjs/common';
 import { InjectModel } from '@nestjs/mongoose';
-import CreatePostsDto from './dto/create-posts.dto';
+import { CreatePostDto, UpdatePostDto } from './dto/create-update-posts.dto';
 import { Post, PostDocument } from './post.schema';
 import { paginate } from '../common/pagination/pagination-mongoose.helper';
 import { PaginationParamsDto } from '../common/pagination/pagination.dto';
 
 @Injectable()
 class PostsService {
-  constructor(@InjectModel(Post.name) private postModel: Model<PostDocument>) { }
+  constructor(@InjectModel(Post.name) private postModel: Model<PostDocument>) {}
 
   async findAll(paginationParams: PaginationParamsDto) {
     return paginate(this.postModel.find(), paginationParams);
@@ -22,12 +22,12 @@ class PostsService {
     return post;
   }
 
-  create(postData: CreatePostsDto) {
+  create(postData: CreatePostDto) {
     const createdPost = new this.postModel(postData);
     return createdPost.save();
   }
 
-  async update(id: string, postData: CreatePostsDto) {
+  async update(id: string, postData: CreatePostDto) {
     const post = await this.postModel
       .findByIdAndUpdate(id, postData)
       .setOptions({ overwrite: true, new: true });
@@ -37,7 +37,7 @@ class PostsService {
     return post;
   }
 
-  async partialUpdate(id: string, postData: CreatePostsDto) {
+  async partialUpdate(id: string, postData: UpdatePostDto) {
     const post = await this.postModel
       .findByIdAndUpdate(id, {
         $set: postData,