feat(medusa): Nested Categories Admin Delete Endpoint (#2975)

**What:**

Introduces an admin endpoint that allows a user to delete a product category, given an ID.

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 delete category
- Creates a method in product category services to delete a category

RESOLVES CORE-957

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

@@ -0,0 +1,88 @@
+import { Request, Response } from "express"
+import { EntityManager } from "typeorm"
+
+import { ProductCategoryService } from "../../../../services"
+
+/**
+ * @oas [delete] /product-categories/{id}
+ * operationId: "DeleteProductCategoriesCategory"
+ * summary: "Delete a Product Category"
+ * description: "Deletes a ProductCategory."
+ * x-authenticated: true
+ * parameters:
+ *   - (path) id=* {string} The ID of the Product Category
+ * 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.delete(product_category_id)
+ *       .then(({ id, object, deleted }) => {
+ *         console.log(id);
+ *       });
+ *   - lang: Shell
+ *     label: cURL
+ *     source: |
+ *       curl --location --request DELETE 'https://medusa-url.com/admin/product-categories/{id}' \
+ *       --header 'Authorization: Bearer {api_token}'
+ * security:
+ *   - api_token: []
+ *   - cookie_auth: []
+ * tags:
+ *   - Product Category
+ * responses:
+ *   200:
+ *     description: OK
+ *     content:
+ *       application/json:
+ *         schema:
+ *           type: object
+ *           properties:
+ *             id:
+ *               type: string
+ *               description: The ID of the deleted product category.
+ *             object:
+ *               type: string
+ *               description: The type of the object that was deleted.
+ *               default: product_category
+ *             deleted:
+ *               type: boolean
+ *               description: Whether the product category was deleted successfully or not.
+ *               default: true
+ *   "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 { id } = req.params
+
+  const productCategoryService: ProductCategoryService = req.scope.resolve(
+    "productCategoryService"
+  )
+
+  const manager: EntityManager = req.scope.resolve("manager")
+
+  await manager.transaction(async (transactionManager) => {
+    return await productCategoryService
+      .withTransaction(transactionManager)
+      .delete(id)
+  })
+
+  res.json({
+    id: id,
+    object: "product_category",
+    deleted: true,
+  })
+}

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

@@ -1,6 +1,8 @@
 import { Router } from "express"
+
 import middlewares, { transformQuery } from "../../../middlewares"
 import { isFeatureFlagEnabled } from "../../../middlewares/feature-flag-enabled"
+import deleteProductCategory from "./delete-product-category"
 
 import getProductCategory, {
   AdminGetProductCategoryParams,
@@ -38,10 +40,13 @@ export default (app) => {
     middlewares.wrap(getProductCategory)
   )
 
+  route.delete("/:id", middlewares.wrap(deleteProductCategory))
+
   return app
 }
 
 export * from "./get-product-category"
+export * from "./delete-product-category"
 export * from "./list-product-categories"
 
 export const defaultAdminProductCategoryRelations = [

packages/medusa/src/services/__tests__/product-category.ts

@@ -96,4 +96,64 @@ describe("ProductCategoryService", () => {
       expect(count).toEqual(0)
     })
   })
+
+  describe("delete", () => {
+    const productCategoryRepository = MockRepository({
+      findOne: query => {
+        if (query.where.id === "not-found") {
+          return Promise.resolve(undefined)
+        }
+
+        if (query.where.id === "with-children") {
+          return Promise.resolve({
+            id: IdMap.getId("with-children"),
+            category_children: [{
+              id: IdMap.getId("skinny-jeans"),
+            }]
+          })
+        }
+
+        return Promise.resolve({
+          id: IdMap.getId("jeans"),
+          category_children: []
+        })
+      },
+      findDescendantsTree: (productCategory) => {
+        return Promise.resolve(productCategory)
+      },
+    })
+
+    const productCategoryService = new ProductCategoryService({
+      manager: MockManager,
+      productCategoryRepository,
+    })
+
+    beforeEach(async () => { jest.clearAllMocks() })
+
+    it("successfully deletes a product category", async () => {
+      const result = await productCategoryService.delete(
+        IdMap.getId("jeans")
+      )
+
+      expect(productCategoryRepository.delete).toBeCalledTimes(1)
+      expect(productCategoryRepository.delete).toBeCalledWith(IdMap.getId("jeans"))
+    })
+
+    it("returns without failure on not-found product category id", async () => {
+      const categoryResponse = await productCategoryService
+        .delete("not-found")
+
+      expect(categoryResponse).toBe(undefined)
+    })
+
+    it("fails on product category with children", async () => {
+      const categoryResponse = await productCategoryService
+        .delete("with-children")
+        .catch((e) => e)
+
+      expect(categoryResponse.message).toBe(
+        `Deleting ProductCategory (with-children) with category children is not allowed`
+      )
+    })
+  })
 })

packages/medusa/src/services/product-category.ts

@@ -98,6 +98,38 @@ class ProductCategoryService extends TransactionBaseService {
 
     return productCategoryTree
   }
+
+  /**
+   * Deletes a product category
+   *
+   * @param productCategoryId is the id of the product category to delete
+   * @return a promise
+   */
+  async delete(productCategoryId: string): Promise<void> {
+    return await this.atomicPhase_(async (manager) => {
+      const productCategoryRepository: ProductCategoryRepository =
+        manager.getCustomRepository(this.productCategoryRepo_)
+
+      const productCategory = await this.retrieve(productCategoryId, {
+        relations: ["category_children"],
+      }).catch((err) => void 0)
+
+      if (!productCategory) {
+        return Promise.resolve()
+      }
+
+      if (productCategory.category_children.length > 0) {
+        throw new MedusaError(
+          MedusaError.Types.NOT_ALLOWED,
+          `Deleting ProductCategory (${productCategoryId}) with category children is not allowed`
+        )
+      }
+
+      await productCategoryRepository.delete(productCategory.id)
+
+      return Promise.resolve()
+    })
+  }
 }
 
 export default ProductCategoryService