feat(medusa): Retrieve (service + controller) a product category (#3004)

What:

Introduces a store endpoint to retrieve a product category

Why:

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

How:

- Creates an endpoint in store routes

RESOLVES CORE-967

packages/medusa/src/api/routes/store/index.js

@@ -17,6 +17,7 @@ import shippingOptionRoutes from "./shipping-options"
 import swapRoutes from "./swaps"
 import variantRoutes from "./variants"
 import paymentCollectionRoutes from "./payment-collections"
+import productCategoryRoutes from "./product-categories"
 import { parseCorsOrigins } from "medusa-core-utils"
 
 const route = Router()
@@ -52,6 +53,7 @@ export default (app, container, config) => {
   giftCardRoutes(route)
   returnReasonRoutes(route)
   paymentCollectionRoutes(route)
+  productCategoryRoutes(route)
 
   return app
 }

packages/medusa/src/api/routes/store/product-categories/__tests__/get-product-category.ts

@@ -0,0 +1,70 @@
+import { IdMap } from "medusa-test-utils"
+import { request } from "../../../../../helpers/test-request"
+import {
+  defaultStoreProductCategoryRelations,
+  defaultStoreScope,
+  defaultStoreProductCategoryFields
+} from ".."
+import {
+  ProductCategoryServiceMock,
+  validProdCategoryId,
+  invalidProdCategoryId,
+} from "../../../../../services/__mocks__/product-category"
+
+describe("GET /store/product-categories/:id", () => {
+  describe("get product category by id successfully", () => {
+    let subject
+
+    beforeAll(async () => {
+      subject = await request("GET", `/store/product-categories/${IdMap.getId(validProdCategoryId)}`)
+    })
+
+    afterAll(() => {
+      jest.clearAllMocks()
+    })
+
+    it("calls retrieve from product category service", () => {
+      expect(ProductCategoryServiceMock.retrieve).toHaveBeenCalledTimes(1)
+      expect(ProductCategoryServiceMock.retrieve).toHaveBeenCalledWith(
+        IdMap.getId(validProdCategoryId),
+        {
+          relations: defaultStoreProductCategoryRelations,
+          select: defaultStoreProductCategoryFields,
+        },
+        defaultStoreScope
+      )
+    })
+
+    it("returns product category", () => {
+      expect(subject.body.product_category.id).toEqual(IdMap.getId(validProdCategoryId))
+    })
+  })
+
+  describe("returns 404 error when ID is invalid", () => {
+    let subject
+
+    beforeAll(async () => {
+      subject = await request("GET", `/store/product-categories/${IdMap.getId(invalidProdCategoryId)}`)
+    })
+
+    afterAll(() => {
+      jest.clearAllMocks()
+    })
+
+    it("calls retrieve from product category service", () => {
+      expect(ProductCategoryServiceMock.retrieve).toHaveBeenCalledTimes(1)
+      expect(ProductCategoryServiceMock.retrieve).toHaveBeenCalledWith(
+        IdMap.getId(invalidProdCategoryId),
+        {
+          relations: defaultStoreProductCategoryRelations,
+          select: defaultStoreProductCategoryFields,
+        },
+        defaultStoreScope
+      )
+    })
+
+    it("throws not found error", () => {
+      expect(subject.body.type).toEqual("not_found")
+    })
+  })
+})

packages/medusa/src/api/routes/store/product-categories/get-product-category.ts

@@ -0,0 +1,88 @@
+import { Request, Response } from "express"
+
+import ProductCategoryService from "../../../../services/product-category"
+import { FindParams } from "../../../../types/common"
+import { transformTreeNodesWithConfig } from "../../../../utils/transformers/tree"
+import { defaultStoreProductCategoryRelations, defaultStoreScope } from "."
+
+/**
+ * @oas [get] /product-categories/{id}
+ * operationId: "GetProductCategoriesCategory"
+ * summary: "Get a Product Category"
+ * description: "Retrieves a Product Category."
+ * x-authenticated: false
+ * parameters:
+ *   - (path) id=* {string} The ID of the Product Category
+ *   - (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.
+ * 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.productCategories.retrieve("pcat-id")
+ *       .then(({ productCategory }) => {
+ *         console.log(productCategory.id);
+ *       });
+ *   - lang: Shell
+ *     label: cURL
+ *     source: |
+ *       curl --location --request GET 'https://medusa-url.com/store/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:
+ *            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 { id } = req.params
+  const { retrieveConfig } = req
+
+  const productCategoryService: ProductCategoryService = req.scope.resolve(
+    "productCategoryService"
+  )
+
+  const productCategory = await productCategoryService.retrieve(
+    id,
+    retrieveConfig,
+    defaultStoreScope
+  )
+
+  res.status(200).json({
+    // TODO: When we implement custom queries for tree paths in medusa, remove the transformer
+    // Adding this here since typeorm tree repo doesn't allow configs to be passed
+    // onto its children nodes. As an alternative, we are transforming the data post query.
+    product_category: transformTreeNodesWithConfig(
+      productCategory,
+      retrieveConfig,
+      defaultStoreScope
+    ),
+  })
+}
+
+export class StoreGetProductCategoryParams extends FindParams {}

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

@@ -0,0 +1,52 @@
+import { Router } from "express"
+import middlewares, { transformQuery } from "../../../middlewares"
+import getProductCategory, {
+  StoreGetProductCategoryParams,
+} from "./get-product-category"
+
+const route = Router()
+
+export default (app) => {
+  app.use("/product-categories", route)
+
+  route.get(
+    "/:id",
+    transformQuery(StoreGetProductCategoryParams, {
+      defaultFields: defaultStoreProductCategoryFields,
+      allowedFields: allowedStoreProductCategoryFields,
+      defaultRelations: defaultStoreProductCategoryRelations,
+      isList: false,
+    }),
+    middlewares.wrap(getProductCategory)
+  )
+
+  return app
+}
+
+export const defaultStoreProductCategoryRelations = [
+  "parent_category",
+  "category_children",
+]
+
+export const defaultStoreScope = {
+  is_internal: false,
+  is_active: true,
+}
+
+export const defaultStoreProductCategoryFields = [
+  "id",
+  "name",
+  "handle",
+  "created_at",
+  "updated_at",
+]
+
+export const allowedStoreProductCategoryFields = [
+  "id",
+  "name",
+  "handle",
+  "created_at",
+  "updated_at",
+]
+
+export * from "./get-product-category"