public void Delete(T entity)
 {
     using (LibertadContext context = new LibertadContext())
     {
         context.Entry(entity).State = EntityState.Deleted;
         context.SaveChanges();
     }
 }
 public void Delete(Expression <Func <T, bool> > predicate)
 {
     using (LibertadContext context = new LibertadContext())
     {
         var entities = context.Set <T>().Where(predicate).ToList();
         entities.ForEach(x => context.Entry(x).State = EntityState.Deleted);
         context.SaveChanges();
     }
 }