/**
* Creates a new StudentTeacher model.
* If creation is successful, the browser will be redirected to the 'view' page.
* @return mixed
*/
public function actionCreate()
{
$model = new StudentTeacher();
$post = Yii::$app->request->post();
if (isset($post['StudentTeacher'])) {
$studentId = $post['StudentTeacher']['student_id'];
$teacherId = $post['StudentTeacher']['teacher_id'];
$exists = StudentTeacher::find()->andWhere(['student_id' => $studentId])->andWhere(['teacher_id' => $teacherId])->exists();
if (true === $exists) {
return $this->render('create', ['model' => $model, 'message' => 'Этут студент уже учится у этого учителя']);
}
}
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->render('create', ['model' => $model, 'message' => 'Ученик успешно назначен учителю']);
} else {
return $this->render('create', ['model' => $model, 'message' => '']);
}
}
/**
* @throws \yii\db\Exception
*/
private function generateLinks()
{
$c = Yii::$app->db->createCommand();
$newBatch = [];
$currentTeacherId = $this->minTeacherId;
do {
$studentsNum = rand(0, $this->getConfig('max_teacher_students'));
if (0 == $studentsNum) {
continue;
}
$batch = [];
while (count($batch) < $studentsNum) {
$batch[rand($this->minStudentId, $this->maxStudentId)] = true;
}
foreach ($batch as $k => $_) {
$newBatch[] = [$k, $currentTeacherId];
}
if (count($newBatch) >= $this->getConfig('insert_portion_size')) {
$c->batchInsert(StudentTeacher::tableName(), ['student_id', 'teacher_id'], $newBatch);
$c->execute();
$newBatch = [];
}
$currentTeacherId++;
} while ($currentTeacherId <= $this->maxTeacherId);
if (!empty($newBatch)) {
$c->batchInsert(StudentTeacher::tableName(), ['student_id', 'teacher_id'], $newBatch);
$c->execute();
}
}
/**
* @return \yii\db\ActiveQuery
*/
public function getListWithStudentsCounrt()
{
$query = Teacher::find()->joinWith(StudentTeacher::tableName())->addSelect([Teacher::tableName() . '.*', 'COUNT(' . StudentTeacher::tableName() . '.student_id) as student_count'])->groupBy(Teacher::tableName() . '.id');
return $query;
}