Hibernate Associations
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Kingsley Amankwah
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// package com.baeldung.hibernate.associations;
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// import org.junit.jupiter.api.Test;
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// import org.junit.jupiter.api.extension.ExtendWith;
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// import org.springframework.beans.factory.annotation.Autowired;
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// import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
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// import org.springframework.test.context.junit.jupiter.SpringExtension;
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// import java.util.Arrays;
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// import java.util.List;
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// import com.baeldung.associations.biredirectional.*;
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// import static org.assertj.core.api.Assertions.assertThat;
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// @ExtendWith(SpringExtension.class)
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// @DataJpaTest
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// public class BidirectionalHibernateIntegrationTest {
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// @Autowired
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// private Course courseRepository;
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// @Autowired
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// private Student studentRepository;
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// @Test
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// public void whenAddingStudentsToCourse_thenCourseHasStudents() {
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// // given
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// Student student1 = new Student();
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// student1.setName("John");
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// Student student2 = new Student();
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// student2.setName("Jane");
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// studentRepository.saveAll(Arrays.asList(student1, student2));
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// Course course = new Course();
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// course.setName("History");
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// courseRepository.save(course);
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// // when
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// List<Student> students = studentRepository.findAll();
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// course.setStudents(students);
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// courseRepository.save(course);
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// // then
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// Course result = courseRepository.findById(course.getId()).get();
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// assertThat(result.getStudents()).containsExactlyInAnyOrder(student1, student2);
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// }
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// }
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package com.baeldung.hibernate.associations;
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import com.baeldung.associations.biredirectional.*;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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import java.util.List;
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public class BidirectionalUnitTest {
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@Test
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public void givenDepartmentWithEmployees_whenGetEmployees_thenReturnListWithEmployees() {
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// given
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Department department = new Department();
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Employee employee1 = new Employee();
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Employee employee2 = new Employee();
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department.getEmployees().add(employee1);
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department.getEmployees().add(employee2);
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// when
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List<Employee> result = department.getEmployees();
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// then
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assertAll("department employees",
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() -> assertEquals(2, result.size()),
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() -> assertTrue(result.contains(employee1)),
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() -> assertTrue(result.contains(employee2))
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);
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}
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@Test
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public void givenCourseWithStudents_whenGetStudents_thenReturnListWithStudents() {
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// given
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Course course = new Course();
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Student student1 = new Student();
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Student student2 = new Student();
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course.getStudents().add(student1);
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course.getStudents().add(student2);
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// when
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List<Student> result = course.getStudents();
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// then
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assertAll("course students",
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() -> assertEquals(2, result.size()),
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() -> assertTrue(result.contains(student1)),
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() -> assertTrue(result.contains(student2))
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);
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}
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}
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package com.baeldung.hibernate.associations;
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public @interface DataJpaTest {
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}
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// // import org.junit.jupiter.api.Assertions;
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// // import org.junit.jupiter.api.Test;
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// // import org.springframework.beans.factory.annotation.Autowired;
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// // import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
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// // import org.springframework.boot.test.context.SpringBootTest;
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// // import org.springframework.transaction.annotation.Transactional;
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// // import java.util.Collections;
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// // import java.util.List;
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// // @DataJpaTest
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// // @Transactional
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// // public class UnidirectionalUnitTest {
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// // @Autowired
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// // private EntityManager entityManager;
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// // @Test
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// // public void givenBookWithAuthor_whenSaved_thenFindBookByAuthor() {
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// // // given
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// // Author author = new Author();
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// // author.setName("John Doe");
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// // Book book = new Book();
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// // book.setTitle("My Book");
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// // book.setAuthors(Collections.singleton(author));
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// // entityManager.persist(author);
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// // entityManager.persist(book);
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// // entityManager.flush();
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// // entityManager.clear();
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// // // when
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// // List<Book> booksByAuthor = entityManager.createQuery(
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// // "select b from Book b join b.authors a where a.name = :name", Book.class)
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// // .setParameter("name", "John Doe")
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// // .getResultList();
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// // // then
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// // Assertions.assertEquals(1, booksByAuthor.size());
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// // Assertions.assertEquals(book, booksByAuthor.get(0));
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// // }
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// // }
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// package com.baeldung.hibernate.associations;
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// import com.baeldung.associations.unidirectional.*;
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// import org.junit.jupiter.api.Test;
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// import org.springframework.beans.factory.annotation.Autowired;
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// import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
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// import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
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// import java.util.List;
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// import java.util.Set;
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// import static org.assertj.core.api.Assertions.assertThat;
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// @DataJpaTest
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// public class UnidirectionalUnitTest {
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// @Autowired
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// private TestEntityManager entityManager;
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// @Test
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// public void givenDepartmentWithEmployees_whenFindById_thenDepartmentWithEmployeesReturned() {
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// // given
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// Employee employee1 = new Employee();
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// Employee employee2 = new Employee();
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// Department department = new Department();
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// department.setEmployees(List.of(employee1, employee2));
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// entityManager.persist(department);
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// entityManager.flush();
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// // when
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// Department foundDepartment = entityManager.find(Department.class, department.getId());
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// // then
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// assertThat(foundDepartment).isEqualTo(department);
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// assertThat(foundDepartment.getEmployees()).containsExactly(employee1, employee2);
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// }
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// @Test
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// public void givenEmployeeWithParkingSpot_whenFindById_thenEmployeeWithParkingSpotReturned() {
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// // given
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// ParkingSpot parkingSpot = new ParkingSpot();
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// entityManager.persist(parkingSpot);
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// entityManager.flush();
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// Employee employee = new Employee();
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// employee.setParkingSpot(parkingSpot);
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// entityManager.persist(employee);
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// entityManager.flush();
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// // when
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// Employee foundEmployee = entityManager.find(Employee.class, employee.getId());
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// // then
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// assertThat(foundEmployee).isEqualTo(employee);
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// assertThat(foundEmployee.getParkingSpot()).isEqualTo(parkingSpot);
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// }
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// @Test
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// public void givenBookWithAuthors_whenFindById_thenBookWithAuthorsReturned() {
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// // given
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// Author author1 = new Author();
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// Author author2 = new Author();
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// entityManager.persist(author1);
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// entityManager.persist(author2);
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// entityManager.flush();
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// Book book = new Book();
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// book.setAuthors(Set.of(author1, author2));
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// entityManager.persist(book);
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// entityManager.flush();
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// // when
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// Book foundBook = entityManager.find(Book.class, book.getId());
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// // then
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// assertThat(foundBook).isEqualTo(book);
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// assertThat(foundBook.getAuthors()).containsExactly(author1, author2);
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// }
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// }
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