public void TestDeletePrincipal()
{
//SETUP
var options = SqliteInMemory.CreateOptions <Chapter06Context>();
using var context = new Chapter06Context(options);
context.Database.EnsureCreated();
context.Add(new OnePrincipal {
Link = new OneDependent()
});
context.SaveChanges();
context.ChangeTracker.Clear();
//ATTEMPT
var depToRemove = new OnePrincipal {
Id = 1
};
context.Remove(depToRemove);
context.SaveChanges();
//VERIFY
context.OneDependents.Count().ShouldEqual(0);
context.OnePrincipals.Count().ShouldEqual(0);
}
public void TestCostOfNotDetaching(int numCollection)
{
//SETUP
ManyTop entityToDetach;
var options = SqliteInMemory.CreateOptions <Chapter06Context>();
using (var context = new Chapter06Context(options))
{
context.Database.EnsureCreated();
//ATTEMPT
using (new TimeThings(_output, "SaveChanges - no tracked entities."))
{
context.SaveChanges();
}
using (new TimeThings(_output, "SaveChanges - no tracked entities."))
{
context.SaveChanges();
}
entityToDetach = context.AddManyTopWithRelationsToDb(numCollection);
var numEntities = entityToDetach.Collection1.Count +
entityToDetach.Collection2.Count +
entityToDetach.Collection3.Count;
using (new TimeThings(_output, $"SaveChanges - {numEntities:n0} tracked entities."))
{
context.SaveChanges();
}
using (new TimeThings(_output, $"SaveChanges - {numEntities:n0} tracked entities."))
{
context.SaveChanges();
}
}
//VERIFY
}
public void TestMissingIncludeNotSafeOk()
{
//SETUP
var options = SqliteInMemory.CreateOptions <Chapter06Context>();
using var context = new Chapter06Context(options);
context.Database.EnsureCreated();
var bookSetup = new BookNotSafe();
bookSetup.Reviews.Add(new ReviewNotSafe());
context.Add(bookSetup);
context.SaveChanges();
context.ChangeTracker.Clear();
//ATTEMPT
var book = context.Books //#A
//... missing Include(x => x.Reviews) //#B
.First(x => x.Reviews.Any());
//VERIFY
book.Reviews.ShouldNotBeNull();
}