rashidi/spring-data-web

Spring Data JPA: Retrieve entity without triggering repository manually. Inspired by a tweet from Josh Long - https://goo.gl/aM3aL7

Spring Data JPA: Retrieve Directly From Web

Look Ma! No repository in between!

Motivation

Inspired by a tweet from Josh Long.

Implementation

Maven

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>

Resource

@RestController
public class BookResource {

    @GetMapping("/book/{id}")
    public ResponseEntity<Book> get(@PathVariable("id") Book book) {
        return Objects.nonNull(book) ? ResponseEntity.ok(book) : ResponseEntity.notFound().build();
    }

}

Verification

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = RANDOM_PORT)
public class BookResourceTest {

    @Autowired
    private BookRepository repository;

    @Autowired
    private TestRestTemplate restTemplate;

    @Before
    public void setUp() {
        repository.save(
                new Book("Spring Data Rest With Web Demo")
        );
    }

    @Test
    public void get() {
        ResponseEntity<Book> response = restTemplate.getForEntity("/book/{id}", Book.class, 1L);

        assertThat(response.getStatusCode())
                .isEqualTo(OK);

        assertThat(response.getBody().getTitle())
                .isEqualTo("Spring Data Rest With Web Demo");
    }

    @Test
    public void getWithNonExistingId() {
        ResponseEntity<Book> response = restTemplate.getForEntity("/book/{id}", Book.class, 100L);

        assertThat(response.getStatusCode())
                .isEqualTo(NOT_FOUND);
    }

}