function testChangingParentIdRelationFieldDirectlyDoesNotWorkIfParentObjectIsDirty()
{
$course1 = $this->_initCourse();
$course1->save();
$course2 = $this->_initCourse();
$course2->save();
$lecture = new LectureForTest();
$lecture->setTitle('Physics');
$lecture->setCourse($course1);
$lecture->save();
$lecture2 = new LectureForTest($lecture->getId());
$this->assertEqual($lecture2->getCourse()->getId(), $course1->getId());
$lecture2->set('course_id', $course2->getId());
$lecture2->setCourse($course1);
$lecture2->save();
$lecture3 = new LectureForTest($lecture->getId());
$this->assertEqual($lecture3->getCourse()->getId(), $course1->getId());
}