Issue #5: HTTP error 500 when flagging content

flag.module

@@ -30,6 +30,7 @@ function flag_autoload_info() {
     'flag_entity'                                => 'includes/flag/flag_entity.inc',
     'flag_flag'                                  => 'includes/flag/flag_flag.inc',
     'flag_broken'                                => 'includes/flag/flag_flag.inc',
+    'flagging'                                   => 'includes/flag/flag.entity.inc',
     'flag_node'                                  => 'includes/flag/flag_node.inc',
     'flag_comment'                               => 'includes/flag/flag_comment.inc',
 
@@ -63,6 +64,7 @@ function flag_entity_info() {
       'label' => t('Flagging'),
       'controller class' => 'FlaggingController',
       'base table' => 'flagging',
+      'entity class' => 'Flagging',
       'fieldable' => TRUE,
       'entity keys' => array(
         'id' => 'flagging_id',
@@ -130,7 +132,6 @@ function flagging_load($flagging_id, $reset = FALSE) {
  *   An unsaved flagging object containing the property values.
  */
 function flagging_create($values = array()) {
-  $flagging = (object) array();
 
   if (!isset($values['flag_name'])) {
     if (isset($values['fid'])) {
@@ -139,6 +140,7 @@ function flagging_create($values = array()) {
       $values['flag_name'] = $flag->name;
     }
   }
+  $flagging = entity_create('flagging', $values);
 
   // Apply the given values.
   foreach ($values as $key => $value) {

includes/flag.entity.inc

@@ -5,14 +5,101 @@
  * Provides supporting code for the entity/fields system.
  *
  * Note: We're making the <em>flaggings</em> fieldable, not the <em>flags</em>.
- * (In the same way that Drupal makes <em>nodes</em> fieldable, not <em>node
+ * (In the same way that Backdrop makes <em>nodes</em> fieldable, not <em>node
  * types</em>).
  */
 
+/**
+ * Defines the flagging entity class.
+ */
+class Flagging extends Entity {
+
+  /**
+   * The flagging ID.
+   *
+   * @var integer
+   */
+  public $flagging_id;
+
+  /**
+   * The flag ID.
+   *
+   * @var integer
+   */
+  public $fid;
+
+  /**
+   * The flag name.
+   *
+   * @var string
+   */
+  public $flag_name;
+
+  /**
+   * The entity type which is being flagged.
+   *
+   * @var string
+   */
+  public $entity_type;
+
+
+  /**
+   * The entity ID.
+   *
+   * @var integer
+   */
+  public $entity_id;
+
+  /**
+   * The flagging user ID.
+   *
+   * @var string
+   */
+  public $uid;
+
+  /**
+   * The user session ID.
+   *
+   * @var integer
+   */
+  public $sid;
+
+
+  /**
+   * Implements EntityInterface::id().
+   */
+  public function id() {
+    return $this->flagging_id;
+  }
+
+  /**
+   * Implements EntityInterface::entityType().
+   */
+  public function entityType() {
+    return 'flagging';
+  }
+
+  /**
+   * Implements EntityInterface::label().
+   */
+  public function label() {
+    return $this->flagging_id;
+  }
+
+  /**
+   * Implements EntityInterface::uri().
+   */
+  public function uri() {
+    return array(
+      'path' => '',
+    );
+  }
+}
+
 /**
  * Controller class for flaggings.
  */
-class FlaggingController extends DefaultEntityController {
+class FlaggingController extends EntityDatabaseStorageController {
 
   protected function buildQuery($ids, $conditions = array(), $revision_id = FALSE) {
     $query = parent::buildQuery($ids, $conditions, $revision_id);

includes/flag/flag_flag.inc

@@ -966,7 +966,7 @@ class flag_flag {
    *   to eventually populate 'entity_id' and 'flagging_id'.
    */
   function new_flagging($entity_id = NULL, $uid = NULL, $sid = NULL) {
-    return (object) array(
+    $flagging = entity_create('flagging',  array(
       'flagging_id' => NULL,
       'flag_name' => $this->name,
       'fid' => $this->fid,
@@ -975,7 +975,8 @@ class flag_flag {
       'uid' => $uid,
       'sid' => $sid,
       // The timestamp is not set until this is saved.
-    );
+    ));
+    return $flagging;
   }
 
   /**