src/AppBundle/Extensions/DataTag/RecommendClassroomsDataTag.php

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<?php

namespace AppBundle\Extensions\DataTag;

class RecommendClassroomsDataTag extends CourseBaseDataTag implements DataTag
{
    /**
     * 获取推荐班级列表.
     *
     * 可传入的参数：
     *   count    必需 班级数量，取值不能超过100
     *
     * @param array $arguments 参数
     *
     * @return array 班级推荐列表
     */
    public function getData(array $arguments)
    {
        $this->checkCount($arguments);

        $conditions = array(
            'status' => 'published',
            'showable' => 1,
            'recommended' => 1,
        );

        $classrooms = $this->getClassroomService()->searchClassrooms(
            $conditions,
            array('recommendedSeq' => 'ASC'),
            0,
            $arguments['count']
        );
        $classroomCount = count($classrooms);

        if ($classroomCount < $arguments['count']) {
            $conditions['recommended'] = 0;

            $classroomTemp = $this->getClassroomService()->searchClassrooms(
                $conditions,
                array('createdTime' => 'DESC'),
                0,
                $arguments['count'] - $classroomCount
            );
            $classrooms = array_merge($classrooms, $classroomTemp);
        }

        foreach ($classrooms as &$classroom) {
            $teacherIds = $this->getClassroomService()->findTeachers($classroom['id']);
            $teachers = $this->getUserService()->findUsersByIds($teacherIds);
            $classroom['users'] = $teachers;
        }

        return $classrooms;
    }

    protected function getClassroomService()
    {
        return $this->getServiceKernel()->getBiz()->service('Classroom:ClassroomService');
    }