#5 - Add sample for derived deleteBy.

Original pull request: #14.

jpa/example/src/main/java/example/springdata/jpa/simple/SimpleUserRepository.java

@@ -29,6 +29,7 @@ import com.google.common.base.Optional;
  * 
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 public interface SimpleUserRepository extends CrudRepository<User, Long> {
 
@@ -72,4 +73,12 @@ public interface SimpleUserRepository extends CrudRepository<User, Long> {
 	 */
 	@Query("select u from User u where u.firstname = :name or u.lastname = :name")
 	List<User> findByFirstnameOrLastname(@Param("name") String name);
+
+	/**
+	 * Returns the total number of entries deleted as their lastnames match the given one.
+	 * 
+	 * @param lastname
+	 * @return
+	 */
+	Long removeByLastname(String lastname);
 }

jpa/example/src/test/java/example/springdata/jpa/simple/SimpleUserRepositoryTests.java

@@ -18,6 +18,7 @@ package example.springdata.jpa.simple;
 import static org.hamcrest.CoreMatchers.*;
 import static org.junit.Assert.*;
 
+import java.util.Arrays;
 import java.util.List;
 
 import org.junit.Before;
@@ -29,10 +30,11 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.transaction.annotation.Transactional;
 
 /**
- * Intergration test showing the basic usage of {@link SimpleUserRepository}.
+ * Integration test showing the basic usage of {@link SimpleUserRepository}.
  * 
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @Transactional
@@ -89,4 +91,21 @@ public class SimpleUserRepositoryTests {
 
 		assertThat(repository.findByUsername("foobar").isPresent(), is(true));
 	}
+
+	@Test
+	public void removeByLastname() {
+
+		// create a 2nd user with the same lastname as user
+		User user2 = new User();
+		user2.setLastname(user.getLastname());
+
+		// create a 3rd user as control group
+		User user3 = new User();
+		user3.setLastname("no-positive-match");
+
+		repository.save(Arrays.asList(user, user2, user3));
+
+		assertThat(repository.removeByLastname(user.getLastname()), is(2L));
+		assertThat(repository.exists(user3.getId()), is(true));
+	}
 }