Spring HATEOAS Resource Assembler和Resource Links有很多变量

时间:2014-11-25 11:05:12

标签: java spring rest hateoas spring-hateoas

我正在使用Spring HATEOAS和Spring堆栈处理REST API,并且我在链接到资源方面遇到了一些问题。

这是我的代码:

控制器:

@RestController
@RequestMapping("/apporteurs/{idInt}/ribs")
public class RibController {

    @Autowired
    private RibResourceAssembler ribResourceAssembler;

    @Autowired
    private RibRepository ribRepository;

    /**
     * Methode GET permettant d'obtenir un Rib par son ID
     *
     * @param idRib ID du Rib
     * @return RibResource
     */
    @RequestMapping(value = "/{idRib}", method = RequestMethod.GET)
    @ResponseBody
    public RibResource getRibById(@PathVariable Long idInt, @PathVariable Long idRib) {

        CurrentUserUtils.checkAuthorizationByApporteur(idInt);
        return ribResourceAssembler.toResource(ribRepository.getRibById(idRib));
    }

}

汇编程序:

@Component
public class RibResourceAssembler extends ResourceAssemblerSupport<Rib, RibResource> {

    public static final long TMP_IDS = 1234L;
    @Autowired
    private RibResourceMapper ribResourceMapper;

    public RibResourceAssembler() {
        super(RibController.class, RibResource.class);
    }

    @Override
    public RibResource toResource(Rib rib) {
        return createResourceWithId(rib.getId(), rib);
    }

    /**
     * TODO : mettre le lien vers l'editique Mandat
     *
     * @param rib Rib à instancier en Resource.
     * @return RibResource
     */
    @Override
    protected RibResource instantiateResource(Rib rib) {
        RibResource ribResource = ribResourceMapper.fromRib(rib, rib.getLastMandat());
        ribResource.removeLinks();

        CustomUserDetails user = CurrentUserUtils.getCurrentUser();

        UriComponentsBuilder uriBuilderMandat = linkTo(RibController.class).toUriComponentsBuilder();
        String uri = uriBuilderMandat.path("/{idRib}/mandats/{idMandat}").buildAndExpand(user.getIdInt(), rib.getId(), TMP_IDS).toUriString();
        Link linkEditiqueMandat = new Link(uri).withRel("editiqueMandat");

        UriComponentsBuilder uriBuilderRib = linkTo(RibController.class).toUriComponentsBuilder();
        String uriSelf = uriBuilderRib.path("/{idRib}").buildAndExpand(user.getIdInt(), rib.getId()).toUriString();
        Link linkUriSelf = new Link(uriSelf).withSelfRel();

        ribResource.add(linkEditiqueMandat);
        ribResource.add(linkUriSelf);

        return ribResource;
    }
}

资源:

public class RibResource extends ResourceSupport {

    private Long idRib;
    private String rum;
    private String iban;
    private String libelle;
    private String dateFin;
    private String dateCreation;
    private String dateModification;
    private String codeOperateurCreation;
    private String dateRegulationMandat;
    private boolean actif;
    private boolean reactivable;
    private CodeValueResource modeReglement;

/*Gzetter & setters, etc*/

}

如您所见,我的控制器在URI中有一些参数:idInt和idRib。

因此,为了制作一个SelfLink,我必须知道这个参数是否像“/ apporteurs / 1234 / ribs / 1234”那样,但我认为Assembler只需要一个参数和一个“简单”的URI。

我有这个堆栈跟踪:

2014-11-25 12:02:09.365 ERROR 20860 --- [nio-9080-exec-1] w.s.m.m.a.ResponseEntityExceptionHandler : Not enough variable values available to expand 'idInt'

所以我正在寻找一个优雅的解决方案,因为我没有找到任何东西^^

我在ResourceProcessor中看到了一些东西,但我没有使用Spring Data Rest。

你能帮帮我吗?提前谢谢你;)

编辑:

结果应为:

_links": {
        "editiqueMandat": {
            "href": "http://localhost:9080/apporteurs/6797/mandats/5822"
        },
        "self": {
                "href": "http://localhost:9080/apporteurs/6797/ribs/1234"
            }
    }

1 个答案:

答案 0 :(得分:3)

@Override
public RibResource toResource(Rib rib) {
    return createResourceWithId(rib.getId(), rib);
}

createResourceWithId()在内部根据控制器的URL创建自我链接。在包含占位符{idInt}的情况下,您必须为其提供参数:

CustomUserDetails user = CurrentUserUtils.getCurrentUser();
return createResourceWithId(rib.getId(), rib, user.getIdInt());

更好的选择是根本不打电话给createResourceWithId()。只需将您现在拥有的所有内容instantiateResource()移至toResource()

即可