/**
* @param Model_Solution $solution
*
* @return null
*/
public static function for_solution($solution)
{
$code = Model_Code::find_by_id($solution->solution_id);
if ($code) {
return $code->source;
}
return null;
}
/**
* the source code of solution
*
* @return string|null
*/
public function source()
{
return Model_Code::for_solution($this);
}