Adds discount decoration

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

@@ -4,7 +4,22 @@ export default async (req, res) => {
     const discountService = req.scope.resolve("discountService")
     const data = await discountService.retrieve(discount_id)
 
-    res.status(200).json({ discount: data })
+    const discount = await discountService.decorate(
+      data,
+      [
+        "code",
+        "is_dynamic",
+        "discount_rule",
+        "usage_count",
+        "disabled",
+        "starts_at",
+        "ends_at",
+        "regions",
+      ],
+      ["valid_for"]
+    )
+
+    res.status(200).json({ discount })
   } catch (err) {
     throw err
   }

packages/medusa/src/services/discount.js

@@ -13,6 +13,7 @@ class DiscountService extends BaseService {
     dynamicDiscountCodeModel,
     totalsService,
     productVariantService,
+    productService,
     regionService,
     eventBusService,
   }) {
@@ -30,6 +31,9 @@ class DiscountService extends BaseService {
     /** @private @const {ProductVariantService} */
     this.productVariantService_ = productVariantService
 
+    /** @private @const {ProductService} */
+    this.productService_ = productService
+
     /** @private @const {RegionService} */
     this.regionService_ = regionService
 
@@ -431,6 +435,28 @@ class DiscountService extends BaseService {
         throw new MedusaError(MedusaError.Types.DB_ERROR, err.message)
       })
   }
+
+  /**
+   * Decorates a discount.
+   * @param {Discount} discount - the discount to decorate.
+   * @param {string[]} fields - the fields to include.
+   * @param {string[]} expandFields - fields to expand.
+   * @return {Discount} return the decorated discount.
+   */
+  async decorate(discount, fields = [], expandFields = []) {
+    const requiredFields = ["_id", "metadata"]
+    const decorated = _.pick(discount, fields.concat(requiredFields))
+
+    if (expandFields.includes("valid_for")) {
+      decorated.discount_rule.valid_for = await Promise.all(
+        decorated.discount_rule.valid_for.map(async p => {
+          return this.productService_.retrieve(p)
+        })
+      )
+    }
+
+    return decorated
+  }
 }
 
 export default DiscountService