YII Call to a member function getErrors() on a non-objec - yii

Question

Following this tutorial; When I try to get the data to display in the form and update
For my error was:
$n = $this->loadModel($id);
I want to make two models with one form, this is my code for update:
Controller:
public function actionUpdate($id)
{
$n = new Noticias;
$m = new Multimedia;
$this->performAjaxValidation(array($n,$m));
$n=$this->loadModel($id);
if(isset($_POST['Noticias'],$_POST['Multimedia']))
{
$n->attributes=$_POST['Noticias'];
$m->attributes=$_POST['Multimedia'];
$m->ID_NOT=$n->ID;
$m->setIsNewRecord(false);
if($n->save())
$this->redirect(array('admin','id'=>$n->ID));
}
$this->render('update',array('n'=>$n,'m'=>$m));
}
update.php
<?php echo $this->renderPartial('_form', array('n'=>$n, 'm'=>$m)); ?>
some view
//get Multimedia FK
<?php if ($n->isNewRecord==false) {
$m=Multimedia::model()->findByPk($n->ID);
} ?>
//Validation
<?php echo $form->errorSummary(array($n,$m)); ?>
//Field FOTO between other
<div class="row">
<?php echo $form->labelEx($m,'FOTO_URL'); ?>
<?php echo $form->textField($m,'FOTO_URL',array('size'=>25,'maxlength'=>100)); ?>
<?php echo $form->error($m,'FOTO'); ?>
</div>

Answer 1

First - do not load models in view
<?php if ($n->isNewRecord==false) {
$m=Multimedia::model()->findByPk($n->ID);
} ?>
This part should be in controller action.
Make sure $m and $n are really models. If findByPk statement above fails, $m will be null, so you will get error from errorSummary which calls $m->getErrors() and $n->getErrors(). In short - make sure $n and $m are properly initialized - both must be instances of model, either empty, or filled from db, but in your case one is null. Most probably $m

Answer 2

this error occur when Noticias (ie $n is newrecord) or $n->ID is not found in Multimedia
you can solve this if you need to work even if its a new record you can use.
if ($n->isNewRecord==false) {
$m=Multimedia::model()->findByPk($n->ID);
}
else
$m=new Multimedia;

Answer 3

You can try to load both models in Controller (ex. in actionUpdate) :
public function actionUpdate($id)
{
$n = new Noticias;
$m = new Multimedia;
$this->performAjaxValidation(array($n,$m));
$n=$this->loadModelNoticias($id);
$m=$this->loadModelMultimedia($n->ID); //just put it here..
if(isset($_POST['Noticias'],$_POST['Multimedia']))
{
$n->attributes=$_POST['Noticias'];
$m->attributes=$_POST['Multimedia'];
$m->ID_NOT=$n->ID;
$m->setIsNewRecord(false);
if($n->save())
$this->redirect(array('admin','id'=>$n->ID));
}
$this->render('update',array('n'=>$n,'m'=>$m));
}
Please be noticed that you have to define both loadModel functions in the same controller too.
function loadModelNoticias($id){
$model = Noticias::model()->findByPk($id);
return $model;
}
function loadModelMultimedia($id){
$model = Multimedia::model()->findByPk($id);
return $model;
}