public void InsertObjectGraph()
{
using (var context = _contextBuilder.GetContext())
{
Course course = new Course() { Title = "Test course", Price = 59.95M };
var schedule = new Schedule() { Course = course, StartDate = new DateTime(2009, 1, 1), EndDate = new DateTime(2009, 12, 31), Location = "Taiga HQ" };
schedule.Teacher = new Teacher() { Name = "Teacher1" };
course.Schedules.Add(schedule);
var coursesSet = context.CreateObjectSet<Course>();
coursesSet.AddObject(course);
context.SaveChanges();
}
using (var context = _contextBuilder.GetContext())
{
var query = from c in context.CreateObjectSet<Course>()
select c;
Assert.AreEqual(1, query.Count());
var course = query.First();
Assert.AreEqual(1, course.Schedules.Count);
var schedule = course.Schedules.First();
Assert.AreEqual(new DateTime(2009, 1, 1), schedule.StartDate);
Assert.AreEqual("Teacher1", schedule.Teacher.Name);
}
}
public void UpdateObjectGraph()
{
// Setup initial object graph
using (var context = _contextBuilder.GetContext())
{
Course course = new Course() { Title = "Test course", Price = 59.95M };
var schedule = new Schedule() { Course = course, StartDate = new DateTime(2009, 1, 1), EndDate = new DateTime(2009, 12, 31), Location = "Taiga HQ" };
schedule.Teacher = new Teacher() { Name = "Teacher1" };
course.Schedules.Add(schedule);
var coursesSet = context.CreateObjectSet<Course>();
coursesSet.AddObject(course);
context.SaveChanges();
}
// Update object graph within a new context.
using (var context = _contextBuilder.GetContext())
{
var course = context.CreateObjectSet<Course>().First();
// Change property value
course.Title = "Test course (updated)";
// Add a new schedule and teacher to the course
var schedule = new Schedule() { Course = course, StartDate = new DateTime(2010, 1, 1), EndDate = new DateTime(2010, 12, 31), Location = "Taiga HQ" };
schedule.Teacher = new Teacher() { Name = "Teacher2" };
course.Schedules.Add(schedule);
// Remove existing schedule from the course
var scheduleToRemove = course.Schedules.Where(s => s.StartDate == new DateTime(2009, 1, 1)).Single();
course.Schedules.Remove(scheduleToRemove);
context.DeleteObject(scheduleToRemove);
context.SaveChanges();
}
// Check.
using (var context = _contextBuilder.GetContext())
{
var query = from c in context.CreateObjectSet<Course>()
select c;
Assert.AreEqual(1, query.Count());
var course = query.First();
Assert.AreEqual("Test course (updated)", course.Title);
Assert.AreEqual(1, course.Schedules.Count);
var schedule = course.Schedules.First();
Assert.AreEqual(new DateTime(2010, 1, 1), schedule.StartDate);
Assert.AreEqual("Teacher2", schedule.Teacher.Name);
Assert.AreEqual(2, context.CreateObjectSet<Teacher>().Count());
}
}