public function getProjectTasks($project_id)
    {
        $result = $this->getProjectTaskAssignments($project_id);
        if ($result->isSuccess()) {
            $tasks = array();
            foreach ($result->data as $taskAssignment) {
                $taskResult = $this->getTask($taskAssignment->task_id);
                if ($taskResult->isSuccess()) {
                    $tasks[$taskResult->data->id] = $taskResult->data;
                }
            }
            $result->data = $tasks;
        }

        return $result;
    }