Adding a form action to a config page - php

Question

I've been trying to make an extension to add some function to the CMS. As it's a setting for the CMS I've added it to the settings tab. While I can take values and save them I needed an action on the page to synchronise a system and I can't get my action to be called, here is my code.
private static $db = array(
'Path' => 'Varchar(50)',
);
private static $allowed_actions = array (
'update',
);
public function updateCMSFields(FieldList $fields)
{
$fields->addFieldsToTab('Root.Importer', array(
ImporterPathField::create('Path', 'Path')->setDescription('Path to area'),
FormAction::create('update', 'Synchronise')
));
}
public function update() {
SS_Log::add_writer(new SS_LogEmailWriter('test#example.com'), SS_Log::ERR);
}
It doesn't get called. If I need to add the function to the left nav rather than part of the settings I'm ok with that too but I also tried that with even less success. Is it possible to get the action called on button press?

Answer 1

You need to place the $allowed_actions and the update method in an extension for CMSSettingsController. Also you should probably put the FormAction into the CMSActions list.
Here's how I would do this:
SiteConfigExtension.php
class SiteConfigExtension extends DataExtension
{
private static $db = array(
'Path' => 'Varchar(50)',
);
public function updateCMSFields(FieldList $fields)
{
$fields->addFieldsToTab('Root.Importer', array(
ImporterPathField::create('Path', 'Path')->setDescription('Path to area')
));
}
public function updateCMSActions(FieldList $actions)
{
$actions->push(
FormAction::create('update', 'Synchronise')
);
}
}
CMSSettingsControllerExtension.php
class CMSSettingsControllerExtension extends DataExtension
{
private static $allowed_actions = array (
'update',
);
public function update() {
SS_Log::add_writer(new SS_LogEmailWriter('test#example.com'), SS_Log::ERR);
}
}