public void TestNormal_Can_AttachFullRootAndTouchTheChildren()
{
// Test we can attach Bill and touch all his children
using (var context = new NormalDbContext())
{
// Attach object graph
context.Set <NormalBillEntity>().Attach(Values.Bill);
// Touch them
Values.Bill.LastUpdated = DateTime.Now;
Values.Cereal1.LastUpdated = DateTime.Now;
Values.Cereal2.LastUpdated = DateTime.Now;
Values.CerealAndFryUpBreakfast.LastUpdated = DateTime.Now;
Values.CerealOnlyBreakfast.LastUpdated = DateTime.Now;
Values.FryUp.LastUpdated = DateTime.Now;
// Save
var rowsAffected = context.SaveChanges();
// All 6 entities should be modified
Assert.AreEqual(6, rowsAffected, "Rows affected mismatch");
}
}
public void TestNormal_Cant_ReadNavigationPropertyOutsideContextWithoutDetach()
{
// Read Bill with only Courses loaded
NormalBillEntity bill0;
using (var context = new NormalDbContext())
{
bill0 = context.Bills.Include(x => x.Courses).Single();
}
// Meals should be inaccessible
var threwException = false;
try
{
var meals = bill0.Meals; // Throwing an exception is not helpful
}
catch (ObjectDisposedException)
{
threwException = true;
}
finally
{
Assert.IsTrue(threwException, "EF should screw you over because of its proxy object");
}
}
public void Initialize()
{
CleanDownSchemaAndRecreate();
Values = new NormalContextTestValues();
EntityMapper = new EntityMapper();
// Insert Bill and children
using (var context = new NormalDbContext())
{
context.Bills.Add(Values.Bill);
var rowsAffected = context.SaveChanges();
Values.AssertCreated(rowsAffected);
}
}
public void TestNormal_Cant_AttachOverlappingGraphsFromDifferentContexts()
{
// Read Bills with only Courses loaded
NormalBillEntity bill0;
using (var context = new NormalDbContext())
{
bill0 = context.Bills.Include(x => x.Courses).Single();
}
// Read first Meal with Courses loaded
NormalMealEntity meal0;
using (var context = new NormalDbContext())
{
meal0 = context.Meals.Include(x => x.Courses).First();
}
// Now try and attach the graphs
using (var context = new NormalDbContext())
{
context.Set <NormalMealEntity>().Attach(meal0);
// Overlapping graph should fail
var threwException = false;
try
{
context.Set <NormalBillEntity>().Attach(bill0); // Throwing an exception is not helpful
}
catch (InvalidOperationException)
{
threwException = true;
}
finally
{
Assert.IsTrue(threwException, "EF should screw you over because it doesn't know what to do with the conflict (type and key match, but different object instance)");
}
}
}
public void TestNormal_Cant_ReadNavigationPropertyOutsideContextAfterDetach()
{
// Read Bill with only Courses loaded and detach
NormalBillEntity bill0;
using (var context = new NormalDbContext())
{
bill0 = context.Bills.Include(x => x.Courses).Single();
Assert.AreEqual(Values.CourseCount, bill0.Courses.Count, "Bill should have courses loaded");
context.Entry(bill0).State = EntityState.Detached;
}
Assert.IsNotNull(bill0.Meals, "Bill should have a Meals collection"); // This is not helpful, we didn't load them
Assert.AreEqual(0, bill0.Meals.Count, "Bill should have no Meals"); // This is not helpful either
Assert.IsNotNull(bill0.Courses, "Bill should have a Courses collection");
Assert.AreEqual(0, bill0.Courses.Count, "Bill should have no Courses"); // This is not helpful either since we did load the Courses
}
