Spring Data REST自定义查询集成

Question

我想为基本上是findByAllFields查询的Employee实体创建一个REST链接。当然，这应该与Page和Sort相结合。为了做到这一点，我实现了以下代码：

@Entity
public class Employee extends Persistable<Long> {
    @Column
    private String firstName;
    @Column
    private String lastName;
    @Column
    private String age;
    @Column
    @Temporal(TemporalType.TIMESTAMP)
    private Date hiringDate;
}

所以我想有一个我可以做的查询：

http://localhost:8080/myApp/employees/search/all?firstName=me&lastName=self&ageFrom=20&ageTo=30&hiringDateFrom=12234433235

所以我有以下Repository

 @RepositoryRestResource(collectionResourceRel="employees", path="employees")
 public interface EmployeeRepository extends PagingAndSortingRepository<Employee, Long>, 
                                                         JpaSpecificationExecutor<Employee> {
 }

好的，所以现在我需要一个RestController

@RepositoryRestController
public class EmployeeSearchController {
    @Autowired
    private EmployeeRepository employeRepository;
    @RequestMapping(value = "/employees/search/all/search/all", method = RequestMethod.GET)
    public Page<Employee> getEmployees(EmployeeCriteria filterCriteria, Pageable pageable) {
        //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria
        Specification<Employee> specification = new EmployeeSpecification(filterCriteria);
        return employeeRepository.findAll(specification, pageable);
}

好的，这显然完成了它的工作，但它没有与HATEOAS集成。我试图组装一个资源，将控制器更改为：

public PagedResources<Resource<Employee>> getEmployees(
                PagedResourcesAssembler<Employee> assembler,
                EmployeeCriteria filterCriteria, Pageable pageable) {
        //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria
        Specification<Employee> specification = new EmployeeSpecification(filterCriteria);
        Page<Employee> employees = employeeRepository.findAll(specification, pageable);
        return assembler.toResource(employees);
}

很明显，我从上面遗漏了一些东西，因为它不起作用，我得到了以下异常：

Could not instantiate bean class [org.springframework.data.web.PagedResourcesAssembler]: No default constructor found;

好的，所以为了让问题变得清楚我正在尝试将上述资源集成到HAEOAS架构的其余部分中我不完全确定这是否是正确的方法，所以欢迎任何其他建议。

编辑：在这里您可以看到类似的实现。请查看配置，您将看到除一个"Person"控制器外的所有控制器都在工作。https://github.com/cgeo7/spring-rest-example

Answer 1

尝试将PagedResourcesAssembler作为类成员自动扭曲，并更改方法签名，类似于下面的

@RepositoryRestController
public class EmployeeSearchController {
    @Autowired
    private EmployeeRepository employeRepository;
    @Autowired
    private PagedResourcesAssembler<Employee> pagedAssembler;
    @RequestMapping(value = "/employees/search/all/search/all", method = RequestMethod.GET)
    public ResponseEntity<Resources<Resource<Employee>>> getEmployees(EmployeeCriteria filterCriteria, Pageable pageable) {
        //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria
        Specification<Employee> specification = new EmployeeSpecification(filterCriteria);
        Page<Employee> employees = employeeRepository.findAll(specification, pageable);
        return assembler.toResource(employees);
    }
}

这与Spring Data Rest 2.1.4完美配合。RELEASE

Answer 2

@Stacke007的代码有效，但资源不包括self链接。为了做到这一点，还需要多一点。

@Autowired
PagedResourcesAssembler<Appointment> pagedResourcesAssembler;
@RequestMapping(value = "/findTodaysSchedule")
public HttpEntity<PagedResources<Resource<Appointment>>> getTodaysSchedule(
        PersistentEntityResourceAssembler entityAssembler, Pageable pageable) {
    Page<Appointment> todaysSchedule = apptRepo.findByStartTimeBetween(beginningOfDay, endOfDay, pageable);
    @SuppressWarnings({ "unchecked", "rawtypes" })
    PagedResources<Resource<Appointment>> resource = pagedResourcesAssembler.toResource(todaysSchedule,
                (ResourceAssembler) entityAssembler);
    return new ResponseEntity<>(resource, HttpStatus.OK);
}

Answer 3

Spring HAEOAS已经更改了Resource、PagedResources和其他一些类的名称。请参见此处。以下是2020年的工作版本。

@RepositoryRestController
public class EmployeeSearchController {
    @Autowired
    private EmployeeRepository employeRepository;
    @Autowired
    private PagedResourcesAssembler<Employee> pagedAssembler;
    @RequestMapping(value = "/employees/search/all", method = RequestMethod.GET)
    public ResponseEntity<PagedModel<EntityModel<Employee>>> getEmployees(PersistentEntityResourceAssembler entityAssembler,,
                                                                          EmployeeCriteria filterCriteria,
                                                                          Pageable pageable) {
        Specification<Employee> specification = new EmployeeSpecification(filterCriteria);
        Page<Employee> employees = employeeRepository.findAll(specification, pageable);
        return ResponseEntity.ok(pagedAssembler.toModel(plants, (RepresentationModelAssembler) entityAssembler));
    }
}