Drupal Custom Entity Page not found - drupal

Question

I am actualy trying to implement my first own entity using this tutorial:
http://www.istos.it/en/blog/drupal-entities/drupal-entities-part-3-programming-hello-drupal-entity
So far anything worked fine, but now i ran in some problem I couldnt get fixed.
After creating my new entity, I get redirected to the page "slider/(id)". But it says that the page could not be found. When I try to open the URL manualy I get the same error.
Here is my code:
he_slider.module
/**
* Implements hook_entitiy_info()
*/
function he_slider_entity_info(){
$slider_info['slider'] = array(
'label' => t('Slider Item'),
'controller class' => 'SliderController',
'views controller class' => 'EntityDefaultViewsController',
'base table' => 'slider',
'uri callback' => 'he_slider_uri',
'fieldable' => TRUE,
'entity keys' => array(
'id' => 'sid',
),
'static cache' => TRUE,
'bundles' => array(
'slider'=> array(
'label' => 'Slider',
'admin' => array(
'path' => 'admin/structure/slider/manage',
'access arguments' => array('administer slider'),
),
),
),
'view modes' => array(
'full' => array(
'label' => t('Full Slider Item'),
'custom settings' => FALSE,
),
)
);
return $slider_info;
}
/**
* URI Callback function
*/
function he_slider_uri($slider){
return array(
'path' => 'slider/' . $slider->id,
);
}
/**
* Load the a single or multiple entities
*/
function he_slider_load($sid = NULL, $reset = FALSE){
$sids = (isset ($sid) ? array($sid) : array());
$slider = slider_load_multiple($sids, $reset);
return $slider? reset ($slider) : FALSE;
}
function he_slider_load_multiple($sids = array(), $conditions = array(), $reset = FALSE){
return entity_load('slider', $sids, $conditions, $reset);
}
/**
* Provides the Pages to administer and view the entities
*/
function he_slider_menu(){
$items['admin/content/slider/add'] = array(
'title' => 'Add Slider Item',
'page callback' => 'he_slider_add',
'access arguments' => array('create slideritem'),
);
$items['admin/structure/slider/manage'] = array(
'title' => 'Slider Administration',
'description' => 'Manage Slider Structure',
'page callback' => 'he_slider_info',
'access arguments' => array('administer slideritem'),
);
$items['slider/%slider'] = array(
'title callback' => 'he_slider_page_title',
'title arguments' => array(1),
'page callback' => 'he_slider_page_view',
'page arguments' => array(1),
'access arguments' => array('view slideritem'),
'type' => MENU_CALLBACK,
);
$items['slider/%slider/edit'] = array(
'title' => 'Slider Edit',
'title arguments' => array(1),
'page callback' => 'he_slider_page_edit',
'page arguments' => array(1),
'access arguments' => array('edit slideritem'),
'type' => MENU_CALLBACK,
);
$items['admin/content/slider/add'] = array(
'title' => 'Add Slider Item!',
'page callback' => 'he_slider_add',
'access arguments' => array('create slideritem'),
);
return $items;
}
function he_slider_permission(){
return array(
'administer slideritem' => array(
'title' => t('Administer Slider'),
'restrict access' => TRUE,
),
'view slideritem' => array(
'title' => t('View Slideritems'),
),
'edit slideritem' => array(
'title' => t('Edit Slideritems'),
)
);
}
function he_slider_info() {
return ('Welcome to the administration page for your Slideritems!');
}
function he_slider_page_title($slider){
return $slider->sid;
}
function he_slider_page_view($slider, $view_mode = 'full'){
$slider->content = array();
// Build fields content.
field_attach_prepare_view('slider', array($slider->sid => $slider), $view_mode);
entity_prepare_view('slider', array($slider->sid => $slider));
$slider->content += field_attach_view('slider', $slider, $view_mode);
return $slider->content;
}
function he_slider_field_extra_fields() {
$return = array();
$return['slider']['slider'] = array(
'form' => array(
'title' => array(
'label' => t('Title'),
'description' => t('Slider Title'),
),
),
);
return $return;
}
/**
* Implements the slider add form, where we are able to create our new entities
*/
function he_slider_add() {
$slider = (object) array (
'sid' => '',
'type' => 'slider',
'title' => '',
);
return drupal_get_form('he_slider_add_form', $slider);
}
function he_slider_add_form($form, &$form_state, $slider) {
$form['title'] = array(
'#type' => 'textfield',
'#title' => t('Note'),
'#required' => TRUE,
);
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Save'),
);
field_attach_form('slider', $slider, $form, $form_state);
return $form;
}
/**
* Implements the Entitiy Edit form
*/
function he_slider_page_edit($slider) {
return drupal_get_form('he_slider_add_form', $slider);
}
/**
* Validates the Entity Add form
*/
function he_slider_add_form_validate($form, &$form_state) {
$slider_submission = (object) $form_state['values'];
field_attach_form_validate('slider', $slider_submission, $form, $form_state);
}
function he_slider_add_form_submit($form, &$form_state) {
$slider_submission = (object) $form_state['values'];
field_attach_submit('slider', $slider_submission, $form, $form_state);
$slider = he_slider_save($slider_submission);
$form_state['redirect'] = "slider/$slider->sid";
}
function he_slider_save(&$slider) {
return entity_get_controller('slider')->save($slider);
}
/**
* Implements hook_views_api().
*/
function he_slider_views_api() {
return array(
'api' => 3,
'path' => drupal_get_path('module', 'slider') . '/views',
);
}
/**
* Implements hook_form_alter().
*/
function he_slider_form_alter(&$form, &$form_state, $form_id) {
if($form_id=='_slider_add_form'){
$form['submit']['#weight'] = 99;
}
}
he_slider.controller.inc:
class SliderController extends DrupalDefaultEntityController {
public function save($slider) {
drupal_write_record('slider', $slider);
field_attach_insert('slider', $slider);
module_invoke_all('entity_insert', $slider, 'slider');
return $slider;
}
}

Answer 1

The problem is here:
$items['slider/%slider'] = array(
Drupal's menu system will look for a function named slider_load(), whereas your entity load function is named he_slider_load(). This causes the router to bail out and throw a 404.
To fix it, simply change that line to
$items['slider/%he_slider'] = array(
And clear your caches.