Why i getting an error "Call to a member function formName() on a non-object" - yii

Question

i try to save multilanguaged content
My About model
...
public function rules() {
return [
[['status', 'date_update', 'date_create'], 'integer'],
[['date_update', 'date_create'], 'required'],
];
}
...
public function getContent($lang_id = null) {
$lang_id = ($lang_id === null) ? Lang::getCurrent()->id : $lang_id;
return $this->hasOne(AboutLang::className(), ['post_id' => 'id'])->where('lang_id = :lang_id', [':lang_id' => $lang_id]);
}
My AboutLang model
public function rules()
{
return [
[['post_id', 'lang_id', 'title', 'content'], 'required'],
[['post_id', 'lang_id'], 'integer'],
[['title', 'content'], 'string'],
];
}
My About controller
public function actionCreate()
{
$model = new About();
$aboutLang = new AboutLang();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
} else {
return $this->render('create', [
'model' => $model,'aboutLang'=>$aboutLang]);
}
}
and my view (create form)
...
<?= $form->field($model, 'status')->textInput() ?>
<?= $form->field($aboutLang, 'title')->textInput() ?>
<?= $form->field($aboutLang, 'content')->textInput() ?>
enter code here
And when i put $aboutLang in create form i get an error "Call to a member function formName() on a non-object"

Answer 1

It looks like the views you are using were generated by Gii. In that case, Gii generates a partial view for the form (_form.php) and two views both for create and update actions (create.php and update.php). These two views perform a rendering of the partial view.
The problem you might have is that you are not passing the variable $aboutLang from create.php to _form.php, that must be done in create.php, when you call renderPartial():
$this->renderPartial("_form", array(
"model" => $model,
"aboutLang" => $aboutLang, //Add this line
));
Hope it helps.

Answer 2

Check your $aboutLang type.
It looks like it is null.
if ($aboutLang) {
echo $form->field($aboutLang, 'title')->textInput();
echo $form->field($aboutLang, 'content')->textInput();
}