如何在子资源中添加HATEOAS链接 [英] How to add HATEOAS links in a sub resource

问题描述

我有一个称为AdminResource的父资源和一个名为AdminModuleResource的子资源.

I have a parent resource called the AdminResource and a child resource called the AdminModuleResource.

父级资源正确地配有HATEOAS链接:

The resource of the parent is correctly fitted with HATEOAS links:

{
  "firstname" : "Stephane",
  "lastname" : "Eybert",
  "email" : "[e-mail]",
  "password" : "e41de4c55873f9c000f4cdaac6efd3aa",
  "passwordSalt" : "7bc7bf5f94fef7c7106afe5c3a40a2",
  "links" : [ {
    "rel" : "self",
    "href" : "http://localhost/admins/3683"
  }, {
    "rel" : "modules",
    "href" : "http://localhost/admins/3683/modules"
  } ],
  "id" : 3683
}

孩子的资源也正确地具有HATEOAS链接:

The resource of the child is also correctly fitted with HATEOAS links:

{
  "module" : "BTS",
  "adminResource" : {
    "firstname" : "Stephane",
    "lastname" : "Eybert",
    "email" : "[e-mail]",
    "password" : "e41de4c55873f9c000f4cdaac6efd3aa",
    "passwordSalt" : "7bc7bf5f94fef7c7106afe5c3a40a2",
    "links" : [ ],
    "id" : 3683
  },
  "links" : [ {
    "rel" : "self",
    "href" : "http://localhost/modules"
  } ],
  "id" : 1087
}

但是其父资源丢失了链接.

But its parent resource has lost its links.

目前，在我的子管理模块资源中时，父管理资源没有其链接.实际上，汇编程序的toResource方法仅提供子管理模块资源的链接.

For now, when inside my child admin module resource, the parent admin resource does not have its links. Indeed the toResource method of the assembler only provides the links for the child admin module resource.

public AdminModuleResource toResource(AdminModule adminModule) {
    AdminModuleResource adminModuleResource = new AdminModuleResource();
    adminModuleResource.fromAdminModule(adminModule);
    adminModuleResource.add(linkTo(AdminModuleController.class).slash(adminModuleResource.getId()).withSelfRel());
    return adminModuleResource;
}

public AdminResource toResource(Admin admin) {
    AdminResource adminResource = createResourceWithId(admin.getId(), admin);
    adminResource.fromAdmin(admin);
    adminResource.add(linkTo(AdminController.class).slash(admin.getId()).slash(UriMappingConstants.MODULES).withRel(UriMappingConstants.MODULES));
    return adminResource;
}

有什么主意，即使在子管理模块资源内部，也可以将链接添加到父管理资源吗?

Any idea how I can add the links to the parent admin resource even when inside the child admin module resource ?

这是我建立资源的方式:

Here is how I build the resources:

public void fromAdminModule(AdminModule adminModule) {
    this.setResourceId(adminModule.getId());
    this.setModule(adminModule.getModule());
    AdminResource adminResource = new AdminResource();
    adminResource.fromAdmin(adminModule.getAdmin());
    this.adminResource = adminResource;
}

public void fromAdmin(Admin admin) {
    this.setResourceId(admin.getId());
    this.setFirstname(admin.getFirstname());
    this.setLastname(admin.getLastname());
    this.setEmail(admin.getEmail().toString());
    this.setPassword(admin.getPassword());
}

谢谢！

Stephane

推荐答案

尽管这个问题已经很老了，但还是偶然发现了，但对于其他实现类似功能的人可能值得回答.基本上，您可以在 AdminResource 上为 AdminModuleResource 创建嵌入式资源，并在 AdminResourceAssembler 中构建这些嵌入式资源的链接.以下代码是此 answer

Just stumbled on this question, even though it is quite old, but may be worth answering for others implementing similar functionality. Basically, you create embedded resources for AdminModuleResource on your AdminResource and build the links for these embedded resources within your AdminResourceAssembler. The code below is a simplified version of what is posted on this answer

在 AdminResource 上添加:

@JsonUnwrapped
private Resources<EmbeddedWrapper> embeddeds;
// + setters/getters

在 AdminResourceAssembler 上添加:

EmbeddedWrappers wrapper = new EmbeddedWrappers(true);

List<EmbeddedWrapper> wrappers = (List<EmbeddedWrapper>) super.buildEmbeddables(entity);
Set<AdminModuleResource> moduleResources = adminResource.getModuleResources( );
if(!moduleResources.isEmpty( ))
    wrappers.add(wrapper.wrap(adminModuleResourceAssembler.toResources(moduleResources)));

adminResource.setEmbeddeds(new Resources<>(wrappers));

这篇关于如何在子资源中添加HATEOAS链接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！