add retrieve discount by code

packages/medusa/src/api/routes/admin/discounts/get-discount-by-code.js

@@ -0,0 +1,35 @@
+import { defaultFields, defaultRelations } from "./"
+
+/**
+ * @oas [get] /discounts/code/{id}
+ * operationId: "GetDiscountsDiscountCode"
+ * summary: "Retrieve a Discount by code"
+ * description: "Retrieves a Discount by its discount code"
+ * parameters:
+ *   - (path) code=* {string} The code of the Discount
+ * tags:
+ *   - Discount
+ * responses:
+ *   200:
+ *     description: OK
+ *     content:
+ *       application/json:
+ *         schema:
+ *           properties:
+ *             discount:
+ *               $ref: "#/components/schemas/discount"
+ */
+export default async (req, res) => {
+  const { code } = req.params
+  try {
+    const discountService = req.scope.resolve("discountService")
+    const discount = await discountService.retrieveByCode(
+      code,
+      defaultRelations
+    )
+
+    res.status(200).json({ discount })
+  } catch (err) {
+    throw err
+  }
+}

packages/medusa/src/api/routes/admin/discounts/index.js

@@ -13,6 +13,10 @@ export default app => {
     "/:discount_id",
     middlewares.wrap(require("./get-discount").default)
   )
+  route.get(
+    "/code/:code",
+    middlewares.wrap(require("./get-discount-by-code").default)
+  )
   route.post(
     "/:discount_id",
     middlewares.wrap(require("./update-discount").default)