public function getSlugs($id_language, $table_name)
	{
		if (!array_key_exists($id_language, $this->cached_slugs))
		{
			$resources = Resource::where('id_language', $id_language)
				->where('column_name', 'slug')
				->where('value', '!=', '')
				->get();
			$this->cached_slugs[$id_language] = array();
			foreach ($resources as $resource)
			{
				if (!array_key_exists($resource->table_name, $this->cached_slugs[$id_language]))
				{
					$this->cached_slugs[$id_language][$resource->table_name] = array();
				}
				$this->cached_slugs[$id_language][$resource->table_name][] = $resource;
			}
		}
		
		return (
			array_key_exists($table_name, $this->cached_slugs[$id_language]) ? 
				$this->cached_slugs[$id_language][$table_name] : 
				array()
		);
	}