通过REST调用使用外键将项添加到集合中 [英] add item to the collection with foreign key via REST call

问题描述

我有2个具有双向关联的jpa实体。

I have 2 jpa entities with bidirectional associasion.

包含项目集合的实体容器（oneToMany）
Ommiting getter / setters

Entity Container that holds collection of items (oneToMany) Ommiting getter/setters

@javax.persistence.Entity
@Table(name = "CONTAINER")
public class Container implements Serializable {
    private static final long serialVersionUID = -3288335692695653843L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "container", cascade = CascadeType.ALL)
    private List<Item> items;

}

实体项目包含返回容器（ManyToOne）的引用，带有属性值和日期。
Ommiting setter / getters

Entity Item contains reference back to the container (ManyToOne), with attributes value and date. Ommiting setter/getters

@javax.persistence.Entity
@Table(name = "ITEM")
public class Record implements Serializable {

    private static final long serialVersionUID = -758343957629274274L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID")
    private Long id;

    @Basic
    private Long value;
    @Basic
    private Date date;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "CONTAINER_ID")
    private Container container;
}

我也使用spring-data存储库来公开数据。

Also i am using spring-data repositories to expose data.

My Interface存储库只是扩展 CrudRepository< Container，Long> 和 CrudRepository< Item，Long>

My Interface repositories just extends CrudRepository<Container, Long> and CrudRepository<Item, Long>

@RepositoryRestResource
public interface ItemRepository extends CrudRepository<Item, Long> {
}

@RepositoryRestResource
public interface ContainerRepository extends CrudRepository<Container, Long> {
}

我正在尝试通过REST调用创建项目。

I am trying to create items via REST calls.

首先我在物品储存库上试过这个 rest / items

First i tried this on items repository rest/items

POST { "value" : 666, "date" : "2016-01-31T23:00:00.000+0000", "container": {"id":"1"}}

但它只是在容器上创建带有空引用的项目。

But it just creates item with null reference on container.

当我尝试通过容器存储库添加 rest / containers / 1 / items

When i try to add via container repository rest/containers/1/items

POST { "value" : 666, "date" : "2016-01-31T23:00:00.000+0000", "container": {"id":"1"}}

我得到 HTTP / 1.1 204无内容和<响应正文为空> 。没有创建实例。

I get HTTP/1.1 204 No Content and <Response body is empty>. No instance is created.

我的问题是如何通过引用容器的REST调用添加项目。

My question is how i can add item via REST call that has reference to the container.

编辑：要指定我的问题，我想为现有容器添加新项目。我不确定如何在通过rest（json）创建Item的实例时处理外来ID键

To specify my question, i want to add new item for the existing container. I am not sure how to deal with with foreign ID key when creating instance of Item via rest(json)

推荐答案

我解决了这个问题通过使用链接到json内的容器来解决问题。

I resolved this issue by using link to the container inside json.

POST {value：666，date：2016-01-31T23： 00：00.000 + 0000，容器：http：// localhost：8080 / container / 1}

我不是确定它是否可以在没有 spring-data-rest

I am not sure if it works without spring-data-rest

编辑：我应该指出，该链接资源必须是 @RepositoryRestResource ，应该是聚合根。

I should point out, that linked resource has to be @RepositoryRestResource and should be aggregate root.

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