리팩토링 예제 코드 시작

src/product/Product.ts

@@ -0,0 +1,34 @@
+export class Product {
+    private readonly id: string;
+    private readonly name: string;
+    private readonly price: number;
+    private readonly status: string;
+    private readonly description: string;
+    private readonly createdAt: Date;
+    private readonly updatedAt: Date;
+    private readonly deletedAt: Date;
+
+    constructor(id: string, name: string, price: number, status: string, description: string, createdAt: Date, updatedAt: Date, deletedAt: Date) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+        this.status = status;
+        this.description = description;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+        this.deletedAt = deletedAt;
+    }
+
+    static newInstance (id: string, name: string, price: number, description: string) {
+        return new Product(
+            id,
+            name,
+            price,
+            "OPEN",
+            description,
+            new Date(),
+            null,
+            null
+        )
+    }
+}

src/product/ProductCreateDto.ts

@@ -0,0 +1,11 @@
+import {Product} from "./Product";
+
+export class ProductCreateDto {
+    private readonly name: string;
+    private readonly price: number;
+    private readonly description: string;
+
+    toEntity(id: string) {
+        return Product.newInstance(id,this.name, this.price, this.description)
+    }
+}

src/product/ProductService.ts

@@ -0,0 +1,42 @@
+import { Product } from "./Product";
+import {ProductCreateDto} from "./ProductCreateDto";
+
+export class ProductService {
+    async create_1 (createDtos: ProductCreateDto[]) {
+        const promiseList = [];
+        const results = [];
+        for(const dto of createDtos) {
+            const entity = dto.toEntity(generateId());
+            const queryParams = [];
+
+            const query = `INSERT INTO ${ CLASS_TABLE_NAME }` +
+                `(${ Object.keys(entity).map(k => convertCamelToSnakeName(k)) }) ` +
+                `VALUES ( ${convertUuidToBinParam()}, ${convertUuidToBinParam()}, ${convertUuidToBinParam()}, ?, ?, ?, ?, ?, ?, NOW(), NOW() )`;
+
+            queryParams.push(
+                entity.id,
+                entity.categoryId,
+                entity.teacherId,
+                entity.nameHash,
+                entity.name,
+                entity.price,
+                entity.state,
+                entity.isDeleted,
+                entity.description
+            );
+            promiseList.push(this.dbConnection.query(query, queryParams))
+            results.push(ClassDto.fromEntity(entity));
+        }
+
+        await Promise.all(promiseList);
+        return results;
+    }
+}
+
+export async function save(product: Product) {
+    console.log(product);
+}
+
+export function generateId() {
+    return "uuid";
+}