public function createCategories()
 {
     $categories = array(array('name' => '親1', 'level' => 1, 'rank' => 1, 'child' => array(array('name' => '子1', 'level' => 2, 'rank' => 4, 'child' => array(array('name' => '孫1', 'level' => 3, 'rank' => 9))))), array('name' => '親2', 'level' => 1, 'rank' => 2, 'child' => array(array('name' => '子2-0', 'level' => 2, 'rank' => 5, 'child' => array(array('name' => '孫2', 'level' => 3, 'rank' => 10))), array('name' => '子2-1', 'level' => 2, 'rank' => 6), array('name' => '子2-2', 'level' => 2, 'rank' => 7))), array('name' => '親3', 'level' => 1, 'rank' => 3, 'child' => array(array('name' => '子3', 'level' => 2, 'rank' => 8, 'child' => array(array('name' => '孫3', 'level' => 3, 'rank' => 11))))));
     foreach ($categories as $category_array) {
         $Category = new Category();
         $Category->setPropertiesFromArray($category_array);
         $Category->setDelFlg(Constant::DISABLED);
         $Category->setCreateDate(new \DateTime());
         $Category->setUpdateDate(new \DateTime());
         $this->app['orm.em']->persist($Category);
         $this->app['orm.em']->flush();
         if (!array_key_exists('child', $category_array)) {
             continue;
         }
         foreach ($category_array['child'] as $child_array) {
             $Child = new Category();
             $Child->setPropertiesFromArray($child_array);
             $Child->setParent($Category);
             $Child->setDelFlg(Constant::DISABLED);
             $Child->setCreateDate(new \DateTime());
             $Child->setUpdateDate(new \DateTime());
             $Category->addChild($Child);
             $this->app['orm.em']->persist($Child);
             $this->app['orm.em']->flush();
             if (!array_key_exists('child', $child_array)) {
                 continue;
             }
             foreach ($child_array['child'] as $grandson_array) {
                 $Grandson = new Category();
                 $Grandson->setPropertiesFromArray($grandson_array);
                 $Grandson->setParent($Child);
                 $Grandson->setDelFlg(Constant::DISABLED);
                 $Grandson->setCreateDate(new \DateTime());
                 $Grandson->setUpdateDate(new \DateTime());
                 $Child->addChild($Grandson);
                 $this->app['orm.em']->persist($Grandson);
                 $this->app['orm.em']->flush();
             }
         }
     }
     // 登録したEntityをEntityManagerからクリアする
     // ソート順が上記の登録順でキャッシュされているため、クリアして、DBから再取得させる
     $this->app['orm.em']->clear();
 }