Feature: Sale Category also shows the products in it to make it easier to check for errors.

bookie/src/app/product/product.service.ts

@@ -30,6 +30,15 @@ export class ProductService {
       .pipe(catchError(this.log.handleError(serviceName, 'list'))) as Observable<Product[]>;
   }
 
+  listOfSaleCategory(id: string): Observable<Product[]> {
+    const options = { params: new HttpParams().set('sc', id) };
+    return this.http
+      .get<Product[]>(`${url}/query`, options)
+      .pipe(catchError(this.log.handleError(serviceName, 'listOfSaleCategory'))) as Observable<
+      Product[]
+    >;
+  }
+
   listIsActiveOfCategory(id: string): Observable<Product[]> {
     const options = { params: new HttpParams().set('mc', id) };
     return this.http