public Operation <ServerModel> UpdateServer(ServerModel model)
{
return(System.Operation.Create(() =>
{
//model.Validate();
var isExist = _context.Servers.Find(model.ServerID);
if (isExist == null)
{
throw new Exception("service does not exist");
}
var entity = model.Edit(isExist, model);
_context.Entry(entity);
_context.SaveChanges();
return model;
}));
}