whereNotNull('channel_id') ->select('channel_id') ->orderBy('created_at') ->get(); foreach ($studentsChannel as $key => $channel) { $channels[] = $channel->channel_id; } return $channels; } public static function role($courseId,$userUid){ $role = CourseMember::where('course_id',$courseId) ->where('user_id') ->value('role'); return $role; } }