src/Biz/Course/Service/Impl/LessonServiceImpl.php

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<?php

namespace Biz\Course\Service\Impl;

use Biz\BaseService;
use Biz\Common\CommonException;
use Biz\Course\LessonException;
use Biz\Course\Service\LessonService;
use Codeages\Biz\Framework\Event\Event;
use Codeages\Biz\Framework\Dao\BatchUpdateHelper;
use AppBundle\Common\ArrayToolkit;

class LessonServiceImpl extends BaseService implements LessonService
{
    const LESSON_LIMIT_NUMBER = 300;

    public function getLesson($lessonId)
    {
        $lesson = $this->getCourseChapterDao()->get($lessonId);

        if (empty($lesson) || 'lesson' != $lesson['type']) {
            $this->createNewException(CommonException::ERROR_PARAMETER());
        }

        return $lesson;
    }

    public function countLessons($conditions)
    {
        $conditions['type'] = 'lesson';

        return $this->getCourseChapterDao()->count($conditions);
    }

    public function createLesson($fields)
    {
        if (!ArrayToolkit::requireds($fields, array('title', 'fromCourseId'))) {
            $this->createNewException(CommonException::ERROR_PARAMETER_MISSING());
        }

        $this->beginTransaction();
        try {
            $lesson = array(
                'courseId' => $fields['fromCourseId'],
                'title' => $fields['title'],
                'type' => 'lesson',
                'status' => 'created',
            );
            $lesson = $this->getCourseChapterDao()->create($lesson);

            $taskFields = $this->parseTaskFields($fields);
            $taskFields['categoryId'] = $lesson['id'];
            $task = $this->getTaskService()->createTask($taskFields);

            $this->commit();

            $this->dispatchEvent('course.lesson.create', new Event($lesson));

            return array($lesson, $task);
        } catch (\Exception $exception) {