<分区>
有没有办法返回加入实体的完整详细信息而不是链接？在下面的示例中，我还想返回产品的详细信息，如果我有 100 次购买的 list ，则无需调用 100 次电话来获取产品详细信息。
Product、User 和 Purchase 实体的存储库都是使用 spring-data-jpa 创建的
{
"_embedded" : {
"purchase" : [ {
"_links" : {
"product" : {
"href" : "http://localhost:8080/webapp/purchase/1/product"
},
"user" : {
"href" : "http://localhost:8080/webapp/purchase/1/user"
}
},
"purchasedOn" : "2014-02-23",
"amount" : 1
} ]
}
}
实体和存储库；
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, targetEntity = Purchase.class, orphanRemoval = true)
@JoinColumn(name = "user_id", updatable = false)
private List<Purchase> purchases = new ArrayList<>();
}
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
}
@Entity
public class Purchase implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
@ManyToOne
@JoinColumn(name = "user_id", referencedColumnName = "id")
private User user;
@ManyToOne(fetch = FetchType.EAGER, targetEntity = Product.class)
@JoinColumn(name = "product_id", referencedColumnName = "id")
private Product product;
@Column(name = "purchase_date")
private Date purchaseDate;
private Integer amount;
}
@Repository
public interface PurchaseRepository extends JpaRepository<Purchase, Long> {}