commercetools：我如何获得产品的产品折扣类型？

Question

我使用commercetools JVM SDK并查询ProductProjections，如果应用绝对产品折扣，如何获取信息？

Answer 1

你需要扩大产品的价格范围内的产品折扣才能够得到这个信息，然后使用与ProductDiscountValue一个instanceof检查：

final ProductProjectionQuery query = ProductProjectionQuery.ofCurrent() 
    //your query predicate 
    .withPredicates(m -> m.id().is(productId)) 
    //asks to expand in every variant the discount information 
    .withExpansionPaths(m -> m.allVariants().prices().discounted().discount()); 
final Optional<ProductProjection> loadedProduct = client().executeBlocking(query).head(); 
assertThat(loadedProduct.isPresent()).isTrue(); 
final ProductProjection productProjection = loadedProduct.get(); 
final List<Price> prices = productProjection.getMasterVariant().getPrices(); 
//here you need to have a look if it is the right price, maybe http://commercetools.github.io/commercetools-jvm-sdk/apidocs/io/sphere/sdk/products/search/ProductVariantFilterSearchModel.html#scopedPrice-- is a better option for you   
final Price price = prices.get(0); 
assertThat(price.getDiscounted()).isNotNull(); 
final ProductDiscount referenceExpandedProductDiscount = price.getDiscounted().getDiscount().getObj(); 
assertThat(referenceExpandedProductDiscount).isNotNull(); 
assertThat(referenceExpandedProductDiscount.getValue() instanceof AbsoluteProductDiscountValue) 
     .as("this is how you check if the discount is absolute") 
     .isTrue();