unique field trigger in update. how i will prevent this . this is my code
$crud = new grocery_CRUD();
$crud->set_table('ekom_member');
$crud->set_subject('Member');
$crud->columns('LastName', 'FirstName', 'Email', 'Password');
$crud->add_fields('LastName', 'FirstName', 'Email', 'Password','confirm_password');
$crud->edit_fields('LastName', 'FirstName', 'Email', 'Password','confirm_password');
$crud->set_rules('Password', 'Password', 'required');
$crud->set_rules('confirm_password', 'Password Confirmation', 'required|matches[Password]');
$crud->set_rules('Email', 'Email', 'required|valid_email|is_unique[ekom_member.Email]');
$crud->callback_before_update(array($this,'unset_email'));
$output = $crud->render();
$this->_example_output($output);