Question

我正在当前项目中使用Spring Data Rest和Hibernate。我只是为某些实体添加了投影，以减少显示信息时对后端的调用量。我的代码如下：

Component.class

@NoArgsConstructor
@RequiredArgsConstructor
@EqualsAndHashCode
@Getter
@Setter
@Slf4j
@Entity
@Table(name = "components")
public class Component
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "component_id", unique = true)
    private Long id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "component", cascade = {
            CascadeType.DETACH,
            CascadeType.PERSIST,
            CascadeType.REFRESH
    })
    private List<Parameter> parameters = new ArrayList<>();

    @NonNull
    @Column(name = "name", nullable = false)
    private String name;
}

Parameter.class

@AllArgsConstructor
@RequiredArgsConstructor
@NoArgsConstructor
@Data
@Entity
@Table(name = "parameters")
public class Parameter
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "parameter_id", unique = true)
    private Long id;

    @NonNull
    @Column(name = "name", nullable = false, unique = true)
    private String key;

    @ManyToOne(fetch = FetchType.EAGER)
    private Component component;

    @Column(name = "type")
    private String type;
}

投影课

@Projection(name = "withParameters", types = { Component.class })
public interface ComponentWithParameters
{
    Long getId();
    String getName();
    List<Parameter> getParameters();
}

投影应将参数完美地添加到组件中：

{
    "name" : "New Component",
    "id" : 1,
    "parameters" : [ {
        "id" : 1,
        "key" : "Parameter_2",
        "type" : null
    }, {
        "id" : 2,
        "key" : "Parameter_19",
        "type" : null
    }, {
        "id" : 18,
        "key" : "Parameter_9",
        "type" : null
    } ],
    "_links" : {
        "self" : {
        "href" : "https://localhost:8020/api/components/1"
        },
        "component" : {
        "href" : "https://localhost:8020/api/components/1{?projection}",
        "templated" : true
        },
        "parameters" : {
        "href" : "https://localhost:8020/api/components/1/parameters{?projection}",
        "templated" : true
        }
    }
}

我期望列表中的参数具有Spring Data Rest通常应用的所有链接。像这样：

{
    "name" : "New Component",
    "id" : 1,
    "parameters" : [ {
        "id" : 1,
        "key" : "Parameter_2",
        "type" : null,
        "_links":{  
            "self":{  
               "href":"http://localhost:8080/api/parameters/1{?projection}",
               "templated":true
            },
            "component":{  
               "href":"http://localhost:8080/api/parameters/1/component"
            }
         }
    }, {
        "id" : 2,
        "key" : "Parameter_19",
        "type" : null,
        "_links":{  
            "self":{  
               "href":"http://localhost:8080/api/parameters/2{?projection}",
               "templated":true
            },
            "component":{  
               "href":"http://localhost:8080/api/parameters/2/component"
            }
         }
    }, {
        "id" : 18,
        "key" : "Parameter_9",
        "type" : null,
        "_links":{  
            "self":{  
               "href":"http://localhost:8080/api/parameters/18{?projection}",
               "templated":true
            },
            "component":{  
               "href":"http://localhost:8080/api/parameters/18/component"
            }
         }
    } ],
    "_links" : {
        "self" : {
        "href" : "https://localhost:8020/api/components/1"
        },
        "component" : {
        "href" : "https://localhost:8020/api/components/1{?projection}",
        "templated" : true
        },
        "parameters" : {
        "href" : "https://localhost:8020/api/components/1/parameters{?projection}",
        "templated" : true
        }
    }
}

我发现了一个this问题，这个问题与我的非常相似，而且显然是一个错误，我想知道这一次是否又是一个问题。

我正在使用以下版本：

spring-data-rest-core：3.1.4。发布
spring-data-rest-webmvc：3.1.4。发布
spring-data-commons：2.1.4。发布
spring-data-jpa：2.1.4。发布

希望有人可以帮助我解决这个问题。谢谢大家。

Spring Data Rest投影中缺少链接

0 个答案: