I'm trying to use Drupal 7's entities and field API to correctly build a new module. What I have been unable to understand from the documentation is the correct way to use the new API to create a 'content type' (not a node type) with a number of set fields, such as Body.

I'm trying to set up the entity using hook_entity_info, then I believe I need to add the body field using field_create_instance, but I can't seem to get it to work.

In mycontenttype.module:

/**
 * Implements hook_entity_info().
 */
function mycontenttype_entity_info() {
   $return = array(
       'mycontenttype' => array(
       'label' => t('My Content Type'),
       'controller class' => 'MyContentTypeEntityController',
       'base table' => 'content_type',
       'uri callback' => 'content_type_uri',
       'entity keys' => array(
            'id' => 'cid',
            'label' => 'title'
       ),
       'bundles' => array(
            'mycontenttype' => array(
                 'label' => 'My Content Type',
                 'admin' => array(
                 'path' => 'admin/contenttype',
                 'access arguments' => array('administer contenttype')
               )
             )
         ),
         'fieldable' => true
       )
   );
   return $return;
}

/** * Implements hook_field_extra_fields(). */ function mycontenttype_field_extra_fields() { $return['mycontenttype']['mycontenttype'] = array( 'form' => array( 'body' => array( 'label' => 'Body', 'description' => t('Body content'), 'weight' => 0, ), ), ); return $return; }

Then does this go in the .install file?

function mycontenttype_install() {
 $field = array(
   'field_name' => 'body',
   'type' => 'text_with_summary',
   'entity_types' => array('survey'),
   'translatable' => TRUE,
 );
 field_create_field($field);

 $instance = array(
   'entity_type' => 'mycontenttype',
   'field_name' => 'body',
   'bundle' => 'mycontenttype',
   'label' => 'Body',
   'widget_type' => 'text_textarea_with_summary',
   'settings' => array('display_summary' => TRUE),
   'display' => array(
   'default' => array(
   'label' => 'hidden',
   'type' => 'text_default',
 ),
   'teaser' => array(
   'label' => 'hidden',
   'type' => 'text_summary_or_trimmed',
 )
)
);
field_create_instance($instance);

}