Codeigniter ION-AUTH在同一电子邮件地址条目上未显示错误

我面临的一个问题是，当我试图更新我的电子邮件地址时，如果我添加了数据库中已经存在的新电子邮件，它应该会显示一个错误。但是它没有显示出来

代码返回错误消息。但是它没有在视图中显示它。我真的需要解决办法

我的ajax调用：

$.ajax({
        type: "POST",
        dataType: 'json',
        data: $('#info_form').serialize()  + '&timezone=' + x + '&timezone_name=' + y,

        url: '<?php echo site_url('profile/change_info')?>',
        success: function (response) {
            if (response.status == 'ok') {

                manual_on(y);
                clearState();
                $('#bullet').removeClass("message-icon-on").addClass("message-icon");
                $('.change').attr('data-id','1').html('Auto Detect Your Timezone: Off');




                $('#profile_message').html(response.message);
                $('#profile_message').children("p").addClass("type-ok").delay(4000).fadeOut(400).css('display', 'block');;
                $('#email_label').html($('input[name=email]', '#info_edit').val());
                $('#info_form')[0].reset();



                switchToView();

                return;
            } else if (response.status == 'validation_error') {
                var first_printed = false;
                $.each(response.fields_statuses, function (field, value) {
                    if (value.status != 'ok' && !first_printed) {
                        $('#profile_message').html(value.message);
                        $('#profile_message').children("p").addClass("type-error").delay(4000).fadeOut(400).css('display', 'block');;
                        first_printed = true;
                    }
                    var input = $('input[name=' + field + ']', '#info_form');
                    show_input_validation(input, value);
                });
                return;
            }
            outputAjaxMessage('#register_message', response);
        }
    });

我的模型

 public function update($id, array $data)
{
    $this->trigger_events('pre_update_user');

    $user = $this->user($id)->row();

    $this->db->trans_begin();



    if ($this->identity_column == 'email' && $this->email_check($email)) {
            $this->set_error('account_creation_duplicate_email');
            return FALSE;
        } elseif ($this->identity_column == 'username' && $this->username_check($username)) {
            $this->set_error('account_creation_duplicate_username');
            return FALSE;
        }







    $data['auto_timezone']=0;// turning timezone auto detection off
    if (array_key_exists($this->identity_column, $data) && $this->identity_check($data[$this->identity_column]) && $user->{$this->identity_column} !== $data[$this->identity_column]) {
        $this->db->trans_rollback();
        $this->set_error('account_creation_duplicate_' . $this->identity_column);

        $this->trigger_events(array('post_update_user', 'post_update_user_unsuccessful'));
        $this->set_error('update_unsuccessful');

        return FALSE;
    }




    // Filter the data passed
    $data = $this->_filter_data($this->tables['users'], $data);

    if (array_key_exists('username', $data) || array_key_exists('password', $data) || array_key_exists('email', $data) || array_key_exists('timezone', $data)) {
        if (array_key_exists('password', $data)) {
            if (!empty($data['password'])) {
                $data['password'] = $this->hash_password($data['password'], $user->salt);
            } else {
                // unset password so it doesn't effect database entry if no password passed
                unset($data['password']);
            }
        }
    }

    $this->trigger_events('extra_where');
    $this->db->update($this->tables['users'], $data, array('id' => $user->id));

    if ($this->db->trans_status() === FALSE) {
        $this->db->trans_rollback();

        $this->trigger_events(array('post_update_user', 'post_update_user_unsuccessful'));
        $this->set_error('update_unsuccessful');
        return FALSE;
    }

    $this->db->trans_commit();

    $this->trigger_events(array('post_update_user', 'post_update_user_successful'));
    $this->set_message('update_successful');
    return TRUE;
}

 public function update($id, array $data)
{
    $this->trigger_events('pre_update_user');

    $user = $this->user($id)->row();

    $this->db->trans_begin();



    if ($this->identity_column == 'email' && $this->email_check($email)) {
            $this->set_error('account_creation_duplicate_email');
            return FALSE;
        } elseif ($this->identity_column == 'username' && $this->username_check($username)) {
            $this->set_error('account_creation_duplicate_username');
            return FALSE;
        }







    $data['auto_timezone']=0;// turning timezone auto detection off
    if (array_key_exists($this->identity_column, $data) && $this->identity_check($data[$this->identity_column]) && $user->{$this->identity_column} !== $data[$this->identity_column]) {
        $this->db->trans_rollback();
        $this->set_error('account_creation_duplicate_' . $this->identity_column);

        $this->trigger_events(array('post_update_user', 'post_update_user_unsuccessful'));
        $this->set_error('update_unsuccessful');

        return FALSE;
    }




    // Filter the data passed
    $data = $this->_filter_data($this->tables['users'], $data);

    if (array_key_exists('username', $data) || array_key_exists('password', $data) || array_key_exists('email', $data) || array_key_exists('timezone', $data)) {
        if (array_key_exists('password', $data)) {
            if (!empty($data['password'])) {
                $data['password'] = $this->hash_password($data['password'], $user->salt);
            } else {
                // unset password so it doesn't effect database entry if no password passed
                unset($data['password']);
            }
        }
    }

    $this->trigger_events('extra_where');
    $this->db->update($this->tables['users'], $data, array('id' => $user->id));

    if ($this->db->trans_status() === FALSE) {
        $this->db->trans_rollback();

        $this->trigger_events(array('post_update_user', 'post_update_user_unsuccessful'));
        $this->set_error('update_unsuccessful');
        return FALSE;
    }

    $this->db->trans_commit();

    $this->trigger_events(array('post_update_user', 'post_update_user_successful'));
    $this->set_message('update_successful');
    return TRUE;
}