在 Spring Data REST 中使用嵌套投影

Question

如何在 OrderProjection 使用 ItemProjection 使用 Spring Data REST 呈现项目的情况下获得预期输出

GET /orders/1?projection=with_items

预测：

@Projection(name = "summary", types = Item.class)
public interface ItemProjection {
    String getName();
}

@Projection(name = "with_item", types = Order.class)
public interface OrderProjection {
    LocalDateTime getOrderedDate();
    Status getStatus();
    Set<ItemProjection> getItems(); // this is marshalling as Set<Item> (full Item graph)
}

目前正在输出：

{
  "status" : "PAYMENT_EXPECTED",
  "orderedDate" : "2014-11-09T11:33:02.823",
  "items" : [ {
    "name" : "Java Chip",
    "quantity" : 1,
    "milk" : "SEMI",
    "size" : "LARGE",
    "price" : {
      "currency" : "EUR",
      "value" : 4.20
    }
  } ],
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/orders/1{?projection}",
      "templated" : true
    },
    "restbucks:items" : {
      "href" : "http://localhost:8080/orders/1/items"
    },
    "curies" : [ {
      "href" : "http://localhost:8080/alps/{rel}",
      "name" : "restbucks",
      "templated" : true
    } ]
  }
}

预期输出：

{
  "status" : "PAYMENT_EXPECTED",
  "orderedDate" : "2014-11-09T11:33:02.823",
  "items" : [ {
    "name" : "Java Chip"
  } ],
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/orders/1{?projection}",
      "templated" : true
    },
    "restbucks:items" : {
      "href" : "http://localhost:8080/orders/1/items"
    },
    "curies" : [ {
      "href" : "http://localhost:8080/alps/{rel}",
      "name" : "restbucks",
      "templated" : true
    } ]
  }
}

Answer 1

您遇到了DATAREST-394，该问题已在几天后修复，并将进入 2.2.2 和 2.3 RC1。它已在所述版本的快照中提供，请随意试用。