Drupal 7 Module Development

Working with Content
watchdog('artwork', '@type: deleted %title.', array('@type' =>
$artwork->type, '%title' => $artwork->title));
}
$types = artwork_types();
drupal_set_message(t('@type %title has been deleted.', array(
'@type' => $types[$artwork->type]->name,
'%title' => $artwork->title)));
}
$form_state['redirect'] = '';
Just to be certain, we first confirm that the $form_state['values']['confirm']
property is set to TRUE. If so, the first thing we need to do is load the artwork. That's
not really necessary for the deletion operation but we need the artwork object for
displaying messages to the user and recording log messages. Then all we do is call
artwork_delete().
It should be no surprise that artwork_delete() is another simple wrapper:
function artwork_delete($aid) {
return artwork_delete_multiple(array($aid));
}
function artwork_delete_multiple($aids) {
return entity_get_controller('artwork')->delete($aids);
}
Like loading, deletion is a multi-value operation. We can delete an arbitrary number
of artworks in one operation, and one is just a special case of many. The heavy lifting
is again handed off to the controller:
public function delete($aids) {
if (!empty($aids)) {
$artworks = $this->load($aids, array());
$transaction = db_transaction();
try {
db_delete('artwork')
->condition('aid', $aids, 'IN')
->execute();
db_delete('artwork_revision')
->condition('aid', $aids, 'IN')
->execute();
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