commercetools - Commercetools：如何获取产品中的产品折扣类型？

Question

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

Answer 1

您需要在产品价格范围内扩展产品折扣才能获取此信息，然后使用带有 ProductDiscountValue 的 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();