round money

src/modules/cart/repositories/cart.repository.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { CacheService } from 'src/modules/utils/cache.service';
+import { roundQuantity } from 'src/modules/products/utils/quantity.utils';
 import { Cart } from '../interfaces/cart.interface';
 
 @Injectable()
@@ -20,7 +21,7 @@ export class CartRepository {
       try {
         const parsed: unknown = JSON.parse(cachedCart);
         if (this.isCart(parsed) && parsed.userId === userId && parsed.shopId === shopId) {
-          return parsed;
+          return this.normalizeCartQuantities(parsed);
         }
       } catch {
         // If parsing fails, return null
@@ -53,6 +54,17 @@ export class CartRepository {
     return `${this.CART_KEY_PREFIX}:${userId}:${shopId}`;
   }
 
+  /**
+   * Coerce cached item quantities to numbers (guards against string concat bugs).
+   */
+  private normalizeCartQuantities(cart: Cart): Cart {
+    for (const item of cart.items) {
+      item.quantity = roundQuantity(item.quantity);
+    }
+    cart.totalItems = roundQuantity(cart.totalItems);
+    return cart;
+  }
+
   /**
    * Type guard to check if an object is a Cart
    */