/// <summary>
/// Attaches the entity to the given context.
/// </summary>
/// <param name="db">The db context</param>
public void Attach(Piranha.DataContext db) {
if (this.Id == Guid.Empty || db.Set<Comment>().Count(t => t.Id == this.Id) == 0)
db.Entry(this).State = EntityState.Added ;
else db.Entry(this).State = EntityState.Modified ;
}
