private void Current_reference_value_for_one_to_many_principal_can_be_read_and_set(EntityState state)
{
using (var context = new F1Context())
{
var teamEntry = GetTeamEntry(context);
teamEntry.State = state;
var refEntry = teamEntry.Reference(t => t.Gearbox);
var value = refEntry.CurrentValue;
Assert.Same(teamEntry.Entity.Gearbox, value);
value = new Gearbox { Id = -7 };
refEntry.CurrentValue = value;
Assert.Same(teamEntry.Entity.Gearbox, value);
if (state != EntityState.Detached && state != EntityState.Deleted)
{
// FK is fixed up without a call to DetectChanges
Assert.Equal(teamEntry.Entity.GearboxId, value.Id);
}
if (state == EntityState.Deleted)
{
Assert.Throws<InvalidOperationException>(() => context.ChangeTracker.DetectChanges()).
ValidateMessage("RelatedEnd_UnableToAddRelationshipWithDeletedEntity");
}
else
{
context.ChangeTracker.DetectChanges();
}
value = refEntry.CurrentValue;
Assert.Same(teamEntry.Entity.Gearbox, value);
refEntry.CurrentValue = null;
Assert.Null(refEntry.CurrentValue);
Assert.Null(teamEntry.Entity.Gearbox);
if (state != EntityState.Detached)
{
// FK is fixed up without a call to DetectChanges
// For Deleted state the FK should already have been null
Assert.Null(teamEntry.Entity.GearboxId);
}
context.ChangeTracker.DetectChanges();
}
}
private DbEntityEntry<Gearbox> GetGearboxEntry(F1Context context)
{
var team = GetTeamEntry(context).Entity;
var gearbox = new Gearbox { Id = 1, Name = "WubbsyGears" };
team.Gearbox = gearbox;
team.Engine.Gearboxes.Add(gearbox);
context.Entry(team).State = EntityState.Unchanged;
return context.Entry(gearbox);
}