Yii2 - Update Complex Form - yii2

Question

I created a Complex Form using two Model Classes:
Courses
CourseStructure
public function actionCreate()
{
$model = new Course();
$request = Yii::$app->request;
if ($model->load(Yii::$app->request->post()) && Yii::$app->request->isAjax) {
//The course was created successfully, so we can use its data to make course structure
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ActiveForm::validate($model);
}
if ($model->load(Yii::$app->request->post())) {
$model->attributes = $_POST['Course'];
$model->course_start_date = date('Y-m-d', strtotime($_POST['Course']['course_start_date']));
$model->created_at = new \yii\db\Expression('NOW()');
}
$model->save(false);
if($model->save(false))
//The course was created successfully, so we can use its data to make course structure
{
// check if topic format
if($model->course_format == Course::TYPE_TOPIC)
{
for( $i = 1; $i <= $model->course_format_no; $i++ )
{
$structure = new CourseStructure();
$structure->course_id = $model->course_id;
$structure->structure_name = $model->course_format . $i;
$structure->structure_id = $i;
// fill in other course structure data here
$structure->save();
}
}
}
else
return $this->render('create', ['model' => $model,]);
} else {
return $this->render('create', [
'model' => $model,
]);
}
}
From CourseControllers, if course_format = TYPE_TOPIC, then based on the course_format_no selected,
some rows are added in course_structure table (CourseStructure). For instance, if course_format_no = 3, it creates three additional rows in course_structure table.
if($model->course_format == Course::TYPE_TOPIC)
{
for( $i = 1; $i <= $model->course_format_no; $i++ )
{
$structure = new CourseStructure();
$structure->course_id = $model->course_id;
$structure->structure_name = $model->course_format . $i;
$structure->structure_id = $i;
// fill in other course structure data here
$structure->save();
}
}
It works fine in CourseCreate Action in CourseController.
Now how do I do it for the CourseUpdate Action, so that if that either reduce the number of rows or increase it in course_structure table based on the course_format_no added in the update.
course_structure
This is what I have:
public function actionUpdate($id)
{
$model = $this->findModel($id);
$old_model = $this->findModel($id);
if ($model->load(Yii::$app->request->post()) && Yii::$app->request->isAjax) {
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ActiveForm::validate($model);
}
if ($model->load(Yii::$app->request->post())) {
$model->attributes = $_POST['Course'];
$model->course_start_date = Yii::$app->dateformatter->getDateFormat($_POST['Course']['course_start_date']);
$model->updated_by = Yii::$app->getid->getId();
$model->updated_at = new \yii\db\Expression('NOW()');
if($model->save(false))
return $this->redirect(['view', 'id' => $model->course_id]);
} else {
return $this->render('update', [
'model' => $model,
]);
}
}
CourseStructure model
class CourseStructure extends \yii\db\ActiveRecord
{
public static function tableName()
{
return 'course_structure';
}
public function rules()
{
return [
[['course_id', 'structure_id', 'summary_format', 'created_by', 'updated_by'], 'integer'],
[['structure_summary'], 'string'],
[['created_at', 'updated_at'], 'safe'],
[['structure_name'], 'string', 'max' => 200],
];
}
public function attributeLabels()
{
return [
'course_structure_id' => 'Course Structure ID',
'course_id' => 'Course ID',
'structure_id' => 'Structure ID',
'structure_name' => 'Structure Name',
'structure_summary' => 'Structure Summary',
'summary_format' => 'Summary Format',
'created_at' => 'Created At',
'created_by' => 'Created By',
'updated_at' => 'Updated At',
'updated_by' => 'Updated By',
];
}
public function getCourses()
{
return $this->hasOne(Course::className(), ['course_id' => 'course_id']);
}
public static function getAllCourseStructure()
{
$dataTmp = self::find()->orderBy('structure_name')->all();
$result = yii\helpers\ArrayHelper::map($dataTmp, 'course_structure_id', 'structure_name');
return $result;
}
}
Courses model
class Course extends \yii\db\ActiveRecord
{
const TYPE_WEEKLY= 'Weekly';
const TYPE_TOPIC='Topic';
public $coursefile;
public static function tableName()
{
return 'course';
}
public function rules()
{
return [
[['course_category_id', 'course_format_no', 'show_grade', 'created_by', 'updated_by'], 'integer'],
[['course_code', 'course_name', 'course_format', 'course_format_no'], 'required', 'message' => ''],
[['course_summary'], 'string'],
[['course_start_date', 'created_at', 'updated_at', 'course_file_path'], 'safe'],
[['course_code'], 'string', 'max' => 100],
[['course_name'], 'string', 'max' => 255],
[['course_num', 'course_format'], 'string', 'max' => 20],
[['course_code'], 'unique'],
[['coursefile'], 'safe'],
[['course_name', 'course_category_id'], 'unique', 'targetAttribute' => ['course_name', 'course_category_id'], 'message' => Yii::t('app', 'The combination of Course Name and Course Category has already been taken.')],
[['coursefile'], 'file', 'extensions' => 'jpg, jpeg, gif, png, pdf, txt, jpeg, xls, xlsx, doc, docx', 'maxFiles' => 4],
[['coursefile'], 'file', 'maxSize'=>'10000000'],
[['course_file_path', 'course_file_name'], 'string', 'max' => 255],
];
}
public function attributeLabels()
{
return [
'course_id' => 'Course ID',
'course_category_id' => 'Course Category',
'course_code' => 'Course Short Name',
'course_name' => 'Course Full Name',
'course_num' => 'Course ID Number',
'course_summary' => 'Course Summary',
'course_start_date' => 'Course Start Date',
'course_format' => 'Course Format',
'course_format_no' => 'No.of Sections',
'course_file_path' => Yii::t('app', 'Pathname'), //'Course File',
'course_file_name' => Yii::t('app', 'Filename'),
'show_grade' => 'Show Grade',
'created_at' => 'Created At',
'created_by' => 'Created By',
'updated_at' => 'Updated At',
'updated_by' => 'Updated By',
];
}
public function getCourseCategory()
{
return $this->hasOne(CourseCategories::className(), ['course_category_id' => 'course_category_id']);
}
public static function getAllCourse()
{
$dataTmp = self::find()->orderBy('course_name')->all();
$result = yii\helpers\ArrayHelper::map($dataTmp, 'course_id', 'course_name');
return $result;
}
public static function getCourseFormat()
{
return[
Yii::t('app', self::TYPE_TOPIC) => Yii::t('app', 'Topic'),
Yii::t('app', self::TYPE_WEEKLY) => Yii::t('app', 'Weekly'),
];
}
}
How do I write the code to update CourseStructure in the ActionUpdate.