hook.php

/**
 * implementation of hook_services_resources_alter()
 */

function localnet_services_services_resources_alter(&$resources, &$endpoint) {
    // NOTE: services resources are cached.  'services:*' needs to be cleared from cache for this to take effect
    #watchdog('res', ppr($resources));
    #watchdog('endpt', ppr($endpoint));

    if (array_key_exists('node', $resources) && array_key_exists('index', $resources['node'])) {

        // change callback, store the name of the default callback
        variable_set('serivces_default_node_index_callback', $resources['node']['index']['callback']);
        $resources['node']['index']['callback'] = '_localnet_services_node_index_resource_override';

        // alter node index resource to load this file
        $resources['node']['index']['file'] = array(
            'type' => 'module',
            'module' => 'localnet_services',
            'name' => 'localnet_services',
        );

        // alter node index resource to add the all_fields argument
        $resources['node']['index']['args'][] = array(
            'name' => 'all_fields',
            'optional' => 1,
            'type' => 'int',
            'description' => "Use node_load to return all node fields.",
            'default value' => 0,
            'source' => array( 'param' => 'all_fields' ),
        );
    }

    if (array_key_exists('node', $resources) && array_key_exists('retrieve', $resources['node'])) {

        // change callback, store the name of the default callback
        variable_set('serivces_default_node_retrieve_callback', $resources['node']['retrieve']['callback']);
        $resources['node']['retrieve']['callback'] = '_localnet_services_node_retrieve_resource_override';

        // alter node index resource to load this file
        $resources['node']['retrieve']['file'] = array(
            'type' => 'module',
            'module' => 'localnet_services',
            'name' => 'localnet_services',
        );
    }
}