Drupal 7 Module Development

Chapter 6
Most entity operations in Drupal assume multiple objects.
Now that we have defined our entity and can load it, what can we do with it? Right
now not much, since we have no way to create or edit entities. We still need to define
the rest of the entity life cycle and expose a UI for it.
Entity management
In practice, different entity types will frequently need a different workflow for
creating, editing, and deleting entities. Some may not even be editable through
the UI. To keep things simple for now, though, we'll stick with the familiar node
workflow and replicate that, more or less.
Because there are several parts, we'll tackle them one at a time:
1. Create an administrative workflow for managing artwork types.
2. Create pages to add and edit artworks.
3. Create a page to view artworks.
4. Create a form for deleting artworks.
Managing artwork types
We'll start with a stub of an admin section for managing artwork types. Although
we will not allow users to create new artwork types we still need to have at least a
very minimal administrative section on which the Field system can hang its interface.
We'll start with a fairly simple artwork_menu() hook:
function artwork_menu() {
$items['admin/structure/artworks'] = array(
'title' => 'Manage artworks',
'description' => 'Manage artworks.',
'page callback' => 'artwork_overview_types',
'access arguments' => array('administer artworks'),
);
$items['admin/structure/artworks/manage/%artwork_type'] = array(
'title' => 'View artwork type',
'title callback' => 'artwork_type_page_title',
'title arguments' => array(4),
'page callback' => 'artwork_information',
'page arguments' => array(4),
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