Spring Data REST自定义查询集成 [英] Spring Data REST custom query integration

问题描述

我想为Employee实体创建一个REST链接，该链接基本上是一个findByAllFields查询.当然，应将其与Page和Sort结合使用.为此，我实现了以下代码:

I want to create a REST link for an Employee entity that will basically be a findByAllFields query. Of course this should be combined with Page and Sort. In order to do that I have implemented the following code:

@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;
}

所以我想说一个我可以做的查询:

So I would like to have lets say a query where I can do:

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，所以现在我需要一个RestController

Ok so now I need a 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);
}

好吧，很明显，这可以完成它的工作，但是它没有与HATEOAS集成. 我尝试组装一个将控制器更改为此的资源:

Ok, obviously this does its job but it is not integrated with HATEOAS. I have attempted to assemble a resource changing the controller to this:

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，我遗漏了上面的内容，因为它不起作用，并且出现了以下异常:

Obviously I'm missing something from the above since it doesnt work and I'm getting the following Exception:

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

好的，为了使问题更明确我正在尝试将上述资源集成到HATEOAS架构的其余部分中.我不确定这是否是正确的方法，因此是否有其他建议欢迎.

Ok so to make the question clear I am trying to integrate the above resource into the rest of the HATEOAS architecture. I'm not entirely sure if this is the correct approach so any other suggestions are welcome.

在这里，您可以看到类似的实现.请看一下配置，您将看到除一个"Person"控制器之外的所有控制器都在工作. https://github.com/cgeo7/spring-rest-example

Here you can see a similar implementation. Please take a look at the configuration, you will see that all but one of the "Person" controllers are working. https://github.com/cgeo7/spring-rest-example

推荐答案

尝试自动将PagedResourcesAssembler作为类成员，并更改方法签名，如下所示:

Try autowring PagedResourcesAssembler as a class member and change method signature something like below

@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

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