feat(medusa): added admin create endpoint for nested categories (#2985)

What:

Introduces an admin endpoint that allows a user to create a product category

Why:

This is part of a greater goal of allowing products to be added to multiple categories.

How:

- Creates a route on the admin scope to create category
- Creates a method in product category services to create a category

RESOLVES CORE-958

packages/medusa/src/api/routes/admin/product-categories/create-product-category.ts

@@ -0,0 +1,126 @@
+import { IsNotEmpty, IsOptional, IsString, IsBoolean } from "class-validator"
+import { Request, Response } from "express"
+import { EntityManager } from "typeorm"
+
+import { ProductCategoryService } from "../../../../services"
+import { AdminProductCategoriesReqBase } from "../../../../types/product-category"
+import { FindParams } from "../../../../types/common"
+
+/**
+ * @oas [post] /product-categories
+ * operationId: "PostProductCategories"
+ * summary: "Create a Product Category"
+ * description: "Creates a Product Category."
+ * x-authenticated: true
+ * parameters:
+ *   - (query) expand {string} (Comma separated) Which fields should be expanded in each product category.
+ *   - (query) fields {string} (Comma separated) Which fields should be retrieved in each product category.
+ * requestBody:
+ *   content:
+ *     application/json:
+ *       schema:
+ *         $ref: "#/components/schemas/AdminPostProductCategoriesReq"
+ * x-codeSamples:
+ *   - lang: JavaScript
+ *     label: JS Client
+ *     source: |
+ *       import Medusa from "@medusajs/medusa-js"
+ *       const medusa = new Medusa({ baseUrl: MEDUSA_BACKEND_URL, maxRetries: 3 })
+ *       // must be previously logged in or use api token
+ *       medusa.admin.productCategories.create({
+ *         name: 'Jeans',
+ *       })
+ *       .then(({ productCategory }) => {
+ *         console.log(productCategory.id);
+ *       });
+ *   - lang: Shell
+ *     label: cURL
+ *     source: |
+ *       curl --location --request POST 'https://medusa-url.com/admin/product-categories' \
+ *       --header 'Authorization: Bearer {api_token}' \
+ *       --header 'Content-Type: application/json' \
+ *       --data-raw '{
+ *           "name": "Jeans",
+ *       }'
+ * security:
+ *   - api_token: []
+ *   - cookie_auth: []
+ * tags:
+ *   - Product Category
+ * responses:
+ *  "200":
+ *    description: OK
+ *    content:
+ *      application/json:
+ *        schema:
+ *          type: object
+ *          properties:
+ *            productCategory:
+ *              $ref: "#/components/schemas/ProductCategory"
+ *  "400":
+ *    $ref: "#/components/responses/400_error"
+ *  "401":
+ *    $ref: "#/components/responses/unauthorized"
+ *  "404":
+ *    $ref: "#/components/responses/not_found_error"
+ *  "409":
+ *    $ref: "#/components/responses/invalid_state_error"
+ *  "422":
+ *    $ref: "#/components/responses/invalid_request_error"
+ *  "500":
+ *    $ref: "#/components/responses/500_error"
+ */
+export default async (req: Request, res: Response) => {
+  const { validatedBody } = req as {
+    validatedBody: AdminPostProductCategoriesReq
+  }
+
+  const productCategoryService: ProductCategoryService = req.scope.resolve(
+    "productCategoryService"
+  )
+
+  const manager: EntityManager = req.scope.resolve("manager")
+  const created = await manager.transaction(async (transactionManager) => {
+    return await productCategoryService
+      .withTransaction(transactionManager)
+      .create(validatedBody)
+  })
+
+  const productCategory = await productCategoryService.retrieve(
+    created.id,
+    req.retrieveConfig,
+  )
+
+  res.status(200).json({ product_category: productCategory })
+}
+
+/**
+ * @schema AdminPostProductCategoriesReq
+ * type: object
+ * required:
+ *   - name
+ * properties:
+ *   name:
+ *     type: string
+ *     description: The name to identify the Product Category by.
+ *   handle:
+ *     type: string
+ *     description: An optional handle to be used in slugs, if none is provided we will kebab-case the title.
+ *   is_internal:
+ *     type: boolean
+ *     description: A flag to make product category an internal category for admins
+ *   is_active:
+ *     type: boolean
+ *     description: A flag to make product category visible/hidden in the store front
+ *   parent_category_id:
+ *     type: string
+ *     description: The ID of the parent product category
+ */
+// eslint-disable-next-line max-len
+export class AdminPostProductCategoriesReq extends AdminProductCategoriesReqBase {
+  @IsString()
+  @IsNotEmpty()
+  name: string
+}
+
+export class AdminPostProductCategoriesParams extends FindParams {}

packages/medusa/src/api/routes/admin/product-categories/index.ts

@@ -1,6 +1,6 @@
 import { Router } from "express"
 
-import middlewares, { transformQuery } from "../../../middlewares"
+import middlewares, { transformQuery, transformBody } from "../../../middlewares"
 import { isFeatureFlagEnabled } from "../../../middlewares/feature-flag-enabled"
 import deleteProductCategory from "./delete-product-category"
 
@@ -12,6 +12,11 @@ import listProductCategories, {
   AdminGetProductCategoriesParams,
 } from "./list-product-categories"
 
+import createProductCategory, {
+  AdminPostProductCategoriesReq,
+  AdminPostProductCategoriesParams,
+} from "./create-product-category"
+
 const route = Router()
 
 export default (app) => {
@@ -21,6 +26,17 @@ export default (app) => {
     route
   )
 
+  route.post(
+    "/",
+    transformQuery(AdminPostProductCategoriesParams, {
+      defaultFields: defaultProductCategoryFields,
+      defaultRelations: defaultAdminProductCategoryRelations,
+      isList: false,
+    }),
+    transformBody(AdminPostProductCategoriesReq),
+    middlewares.wrap(createProductCategory)
+  )
+
   route.get(
     "/",
     transformQuery(AdminGetProductCategoriesParams, {
@@ -48,6 +64,7 @@ export default (app) => {
 export * from "./get-product-category"
 export * from "./delete-product-category"
 export * from "./list-product-categories"
+export * from "./create-product-category"
 
 export const defaultAdminProductCategoryRelations = [
   "parent_category",
@@ -60,4 +77,6 @@ export const defaultProductCategoryFields = [
   "handle",
   "is_active",
   "is_internal",
+  "created_at",
+  "updated_at",
 ]