Also if not documented, it is possible to add a partial filter completely managed from the developer.

Define in config/generator.yml

generator:
param:
list:
fields:
filter_on_account: {name: Account, filter_criteria_disabled: true }

filters: [_filter_on_account]

Now define in templates/_filter_on_account.php something like

<?php

if ($sf_user->hasCredential('admin')) {

$c = new Criteria();
$c->addAscendingOrderByColumn(ArAsteriskAccountPeer::NAME);

$accounts = ArAsteriskAccountPeer::doSelect($c);

$options = array(""=>"");
foreach($accounts as $account) {
$options[$account->getId()] = $account->getName();
}

$defaultChoice = "";
if (isset($filters['filter_on_account'])) {
$defaultChoice = $filters['filter_on_account'];
}

echo select_tag('filters[filter_on_account]', options_for_select($options, $defaultChoice));

}
?>

And then in actions/actions.class.php redefine the function

protected function addFiltersCriteria($c)
{
if (isset($this->filters['filter_on_account'])) {
$accountId = $this->filters['filter_on_account'];
if ($accountId != "") {
$c->add(ArAsteriskAccountPeer::ID, $accountId);
}
}

parent::addFiltersCriteria($c);
}

documented on: 2007-02-07, Massimo Zaniboni