src/AppBundle/Controller/Callback/CloudSearch/Resource/Courses.php

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<?php

namespace AppBundle\Controller\Callback\CloudSearch\Resource;

use AppBundle\Controller\Callback\CloudSearch\BaseProvider;
use AppBundle\Common\ArrayToolkit;
use Symfony\Component\HttpFoundation\Request;

/**
 * 课程资源集合(对应course_set表).
 */
class Courses extends BaseProvider
{
    public function get(Request $request)
    {
        $conditions = $request->query->all();
        $cursor = $request->query->get('cursor', time());
        $start = $request->query->get('start', 0);
        $limit = $request->query->get('limit', 20);

        $conditions['status'] = 'published';
        $conditions['parentId'] = 0;
        $conditions['updatedTime_GE'] = $cursor;

        $courseSets = $this->getCourseSetService()->searchCourseSets($conditions, array('updatedTime' => 'ASC'), $start, $limit);
        $courseSets = $this->build($courseSets);
        $next = $this->nextCursorPaging($cursor, $start, $limit, $courseSets);

        return $this->wrap($this->filter($courseSets), $next);
    }

    public function filter($res)
    {
        return $this->multicallFilter('course', $res);
    }

    public function build($courseSets)
    {
        $courseSets = $this->buildCategories($courseSets);
        $courseSets = $this->buildTags($courseSets);
        $courseSets = $this->buildCourses($courseSets);

        return $courseSets;
    }

    protected function buildCategories($courseSets)
    {
        $categoryIds = ArrayToolkit::column($courseSets, 'categoryId');
        $categories = $this->getCategoryService()->findCategoriesByIds($categoryIds);

        foreach ($courseSets as &$courseSet) {
            if (isset($categories[$courseSet['categoryId']])) {
                $courseSet['category'] = array(
                    'id' => $categories[$courseSet['categoryId']]['id'],
                    'name' => $categories[$courseSet['categoryId']]['name'],
                );
            } else {
                $courseSet['category'] = array();
            }
        }