public function takeQuiz()
{
//check if quiz can be taken by student,
//based on the time and the ID number
$page_title = 'Cannot Take Quiz';
$page_content = View::make('no_quiz');
$id_number = Session::get('id_number');
$quiz_code = Session::get('quiz_code');
$current_datetime = Carbon::now()->toDateTimeString();
$quiz_schedule = QuizSchedule::where('quiz_code', '=', $quiz_code)->whereRaw(DB::raw("'{$current_datetime}' BETWEEN datetime_from AND datetime_to"))->first();
if ($quiz_schedule) {
$quiz_schedule_id = $quiz_schedule->id;
$class_id = $quiz_schedule->class_id;
$quiz_id = $quiz_schedule->quiz_id;
$student = StudentClass::where('student_id', '=', $id_number)->where('class_id', '=', $class_id)->first();
if ($student) {
//when a student takes a quiz, a row is created on the
//student_quizzes table, add the started_at, quiz_id, and student_id
//when another student comes along and inputs the same id number
//and quiz code, they won't be allowed since the quiz is already taken
$student_quiz_count = StudentQuiz::where('student_id', '=', $id_number)->where('quiz_id', '=', $quiz_id)->count();
if ($student_quiz_count === 0) {
//can take
//get quiz details and show it to the student
$quiz = Quiz::where('id', '=', $quiz_id)->first();
Session::put('quiz_id', $quiz_id);
Session::put('quiz_title', $quiz->title);
$items = QuizItem::where('quiz_id', '=', $quiz_id)->orderByRaw("RAND()")->get();
$item_ids = DB::table('quiz_items')->where('quiz_id', '=', $quiz_id)->lists('id');
$quiz_items_answers = DB::table('quiz_items_answers')->whereIn('quiz_item_id', $item_ids)->get();
$quiz_items_choices = DB::table('quiz_items_choices')->whereIn('quiz_item_id', $item_ids)->get();
$quiz_items = array();
foreach ($items as $item) {
$quiz_items[$item->id] = array('question' => $item->question);
}
foreach ($quiz_items_choices as $qic) {
$quiz_items[$qic->quiz_item_id]['choices'][] = $qic->choice;
}
$seconds = $quiz->minutes * 60 + 1;
$page_data = array('quiz' => $quiz, 'quiz_items' => $quiz_items, 'seconds' => $seconds);
//create student quiz
$student_quiz = new StudentQuiz();
$student_quiz->student_id = $id_number;
$student_quiz->quiz_id = $quiz_id;
$student_quiz->quiz_schedule_id = $quiz_schedule_id;
$student_quiz->started_at = Carbon::now()->toDateTimeString();
$student_quiz->save();
$page_title = 'Take Quiz';
$page_content = View::make('quiz', $page_data);
}
}
}
$this->layout->title = $page_title;
$this->layout->quiz = true;
$this->layout->content = $page_content;
}
public function exportScores($id)
{
//check if current user has created the quiz
$user_id = Auth::user()->id;
$quiz_schedule = QuizSchedule::find($id);
$quiz = Quiz::find($quiz_schedule->quiz_id);
$class = DB::table('classes')->where('id', '=', $quiz_schedule->class_id)->first();
if ($quiz_schedule->user_id != $user_id) {
return Redirect::to('/scores/' . $id)->with('message', array('type' => 'danger', 'text' => 'You do not have the permission to export scores for this quiz.'));
}
$filename = "{$class->name}-{$quiz->title}-{$quiz_schedule->datetime_from}";
Excel::create($filename, function ($excel) use($id, $quiz_schedule) {
$excel->sheet('score-sheet', function ($sheet) use($id, $quiz_schedule) {
$scores = DB::table('student_quizzes')->where('quiz_schedule_id', '=', $id)->lists('score', 'student_id');
$students = DB::table('students')->join('student_classes', 'students.id', '=', 'student_classes.student_id')->select('students.id', 'last_name', 'first_name', 'middle_initial')->where('student_classes.class_id', '=', $quiz_schedule->class_id)->orderBy('gender', 'DESC')->orderBy('last_name', 'ASC')->get();
$student_scores = array(array('ID Number', 'Student Name', 'Score'));
foreach ($students as $student) {
$score = '';
if (isset($scores[$student->id])) {
$score = $scores[$student->id];
}
$student_scores[] = array('id' => $student->id, 'name' => "{$student->last_name}, {$student->first_name} {$student->middle_initial}", 'score' => $score);
}
$sheet->fromArray($student_scores, null, 'A1', false, false);
});
})->export('xls');
}
