private void DbPropertyEntry_method_can_be_used_on_previously_detached_entry_after_the_entity_becomes_tracked(
Action<DbPropertyEntry> test)
{
using (var context = new F1Context())
{
var team = new Team
{ Id = -1, Name = "Wubbsy Racing", Chassis = new Chassis { TeamId = -1, Name = "Wubbsy" } };
var entry = context.Entry(team).Property(t => t.Name);
context.Teams.Attach(team);
test(entry); // Just testing here that this doesn't throw
}
}
// Note that simple cases such as nulls that don't involve EF metadata are tested in the unit tests
private DbEntityEntry<Team> GetTeamEntry(F1Context context)
{
var team = new Team
{ Id = -1, Name = "Wubbsy Racing", Chassis = new Chassis { TeamId = -1, Name = "Wubbsy" } };
team.Engine = new Engine
{
Id = -2,
Name = "WubbsyV8",
Teams = new List<Team> { team },
Gearboxes = new List<Gearbox>()
};
context.Teams.Attach(team);
return context.Entry(team);
}
private void Current_reference_value_for_one_to_one_principal_can_be_read_and_set(EntityState state)
{
using (var context = new F1Context())
{
var chassisEntry = context.Entry(GetTeamEntry(context).Entity.Chassis);
chassisEntry.State = state;
var refEntry = chassisEntry.Reference(c => c.Team);
var value = refEntry.CurrentValue;
Assert.Same(chassisEntry.Entity.Team, value);
if (state == EntityState.Unchanged || state == EntityState.Modified)
{
// Changing the reference to the principal will cause EF to throw a referential integrity exception
// because it would need a change in the PK of the dependent.
Assert.Throws<InvalidOperationException>(() => refEntry.CurrentValue = new Team()).ValidateMessage(
"EntityReference_CannotChangeReferentialConstraintProperty");
}
else
{
value = new Team();
refEntry.CurrentValue = value;
Assert.Same(chassisEntry.Entity.Team, value);
if (state == EntityState.Deleted)
{
Assert.Throws<InvalidOperationException>(() => context.ChangeTracker.DetectChanges()).
ValidateMessage("RelatedEnd_UnableToAddRelationshipWithDeletedEntity");
}
else
{
context.ChangeTracker.DetectChanges();
}
value = refEntry.CurrentValue;
Assert.Same(chassisEntry.Entity.Team, value);
}
refEntry.CurrentValue = null;
Assert.Null(refEntry.CurrentValue);
Assert.Null(chassisEntry.Entity.Team);
context.ChangeTracker.DetectChanges();
}
}
public void Adding_entity_of_wrong_type_to_non_generic_local_view_throws()
{
var team = new Team
{
Id = -1,
Name = "Wubbsy Racing"
};
var expectedException = GenerateException(() => ((IList)new List<Driver>()).Add(team));
using (var context = new F1Context())
{
var local = context.Set(typeof(Driver)).Local;
Assert.Equal(expectedException.Message, Assert.Throws<ArgumentException>(() => local.Add(team)).Message);
}
}
