Spring Data REST 自定义查询集成

Question

我想为 Employee 实体创建一个 REST 链接，该实体基本上是一个 findByAllFields 查询。当然这应该与 Page 和 Sort 结合使用。为此，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;
}

所以我想提出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，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，显然这可以完成它的工作，但 它没有与 HATEOAS 集成。我试图组装一个资源，将 Controller 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);
}

显然我从上面遗漏了一些东西，因为它不起作用并且我得到了以下异常:

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

好的，让问题更清楚我正在尝试将上述资源集成到 HATEOAS 架构的其余部分中。我不完全确定这是否是正确的方法，所以还有其他建议欢迎。

编辑:在这里你可以看到一个类似的实现。请看一下配置，你会看到除了一个“Person” Controller 之外的所有 Controller 都在工作。 https://github.com/cgeo7/spring-rest-example

Answer 1

尝试将 PagedResourcesAssembler 作为类成员并更改方法签名，如下所示

@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.RELEASE 完美配合