Yii2 inserting new record on update - php

Question

I have a setup where for one of the Model I have repeat fields like user and userchildren
so userchildren have a set of fields like child_name, child_birth_date and child_gender
My controller code is like this:
public function actionUpdateProfile()
{
$user_id = Yii::$app->user->identity->id;
$model = User::find()->where(['id' => $user_id])->one();
$UserProfile = UserProfile::find()->where(['user_id' => $model->id])->one();
$userbillinginfo = UserBillingInfo::find()->where(['user_id' => $model->id])->one();
$userchildren = UserChildren::find()->where(['user_id' => $model->id])->all();
if ($userchildren) {
$profile = $UserProfile;
$billinginfo = $userbillinginfo;
$userchild = $userchildren;
} else {
$profile = new UserProfile;
$profile->user_id = $model->id;
$billinginfo = new UserBillingInfo;
$billinginfo->user_id = $model->id;
$userchild = New UserChildren;
$userchild->user_id = $model->id;
}
if (Yii::$app->request->isAjax && $model->load($_POST)) {
Yii::$app->response->format = 'json';
return \yii\bootstrap\ActiveForm::validate($model);
}
if (Yii::$app->request->isAjax && $profile->load($_POST)) {
Yii::$app->response->format = 'json';
return \yii\bootstrap\ActiveForm::validate($profile);
}
if (Yii::$app->request->isAjax && $billinginfo->load($_POST)) {
Yii::$app->response->format = 'json';
return \yii\bootstrap\ActiveForm::validate($billinginfo);
}
if (Yii::$app->request->isAjax && $userchild->load($_POST)) {
Yii::$app->response->format = 'json';
return \yii\bootstrap\ActiveForm::validate($userchild);
}
if ($model->load(Yii::$app->request->post()) && $profile->load(Yii::$app->request->post()) && $billinginfo->load(Yii::$app->request->post())) {
$model->username = $model->email;
$model->save();
$profile->save();
$billinginfo->save();
if (!empty($_POST['UserChildren']) && !is_null($_POST['UserChildren'])) {
foreach ($_POST['UserChildren'] as $rows) {
$userchild = New UserChildren;
$userchild->attributes = $rows;
$userchild->user_id = $model->id;
$userchild->save();
}
}
return $this->redirect(['view']);
} else {
return $this->render('update-profile', [
'model' => $model,
'profile' => $profile,
'billinginfo' => $billinginfo,
'userchild' => $userchild,
]);
}
}
I am facing two issues:
first, when I go for an update of the profile the data is shown properly in the form, I can add records without any issue to the Model UserChildren
But if I edit an existing record it is inserting this as a new record, whereas I expect this to be updated.
I had this line of code like below:
,
if ($model->load(Yii::$app->request->post()) and
$profile->load(Yii::$app->request->post()) and
$billinginfo->load(Yii::$app->request->post()) and
$billinginfo->load(Yii::$app->request->post())
) {
...
but after I updated the line of code,
$userchildren = UserChildren::find()->where(['user_id' => $model->id])->one();
to
$userchildren = UserChildren::find()->where(['user_id' => $model->id])->all();
and thus had to modify the line like below:
if ($model->load(Yii::$app->request->post()) && $profile->load(Yii::$app->request->post()) && $billinginfo->load(Yii::$app->request->post()) ) {
What I am missing here? Thanks.