This document provides code snippets for building a training site in Drupal. It shows how to style buttons using preprocess_field and construct a migration class to pull in location data from additional tables for the training nodes. The migration class overrides the query and prepareRow methods to join the location tables and filter out past events.

2. Drupal Step-by-Step: How
We Built Our Training site
(part 1)
Site architecture and construction

15. We use preprocess_field to style the buttons (class, icon, popup
text).

23. class TrainingNodeEventMigration extends DrupalNode6Migration {
public function __construct(array $arguments) {
parent::__construct($arguments);
}
protected function query() {
// Pull in the default parent query and add our own join to it.
$query = parent::query();
// Join the location tables, as they're not CCK, so migrate can't see them by
// itself. These fields will now appear in the d2d ui.
$query->join('location_instance', 'i', 'i.nid = n.nid AND i.vid = n.vid');
$query->join('location', 'l', 'l.lid = i.lid');
$query->fields('l', array('name', 'street', 'additional', 'city', 'province',
'postal_code', 'country', 'latitude', 'longitude', 'source'));
return $query;
}
...

24. public function prepareRow($row) {
// Date value2 is the end time.
$event_date = strtotime($row->{'field_date:value2'});
$now = strtotime('now');
if ($now > $event_date) {
// This excludes the node.
return FALSE;
}
// Everything else is allowed.
return TRUE;
}