edit 2 models with one view and controller cakephp - cakephp

Question

I have 2 models. Typology and TypologyPicture. and 2 controllers Typologies and TypologyPictures. I want to edit both typology and typologyPcture from one controller.
<?php echo $this->Form->create('TypologyPicture', array('type'=>'file')); ?>
<legend><?php echo __('Edit Typology Picture'); ?></legend>
<?php echo $this->Form->input('id'); ?>
<!-- Here is the first part for the update Typolohgy -->
<?php echo $this->Form->input('Typology.item_id',array('empty'=>true)); ?>
<?php echo $this->Form->input('Typology.title'); ?>
<?php echo $this->Form->input('Typology.description');?>
<?php echo $this->Form->input('Typology.thumbnail',array('type'=>'file')); ?>
<?php echo $this->Form->input('Typology.typology_category_id',array('empty'=>true)); ?>
<?php echo $this->Form->input('Typology.typology_condition_id',array('empty'=>true)); ?>
<?php echo $this->Form->input('Typology.price',array('placeholder'=>'Price')); ?>
<!-- Here is the second part for the update Typpology Picture -->
<?php echo $this->Form->input('pic_path', array('label'=>'Picture','type'=>'file')); ?>
<?php echo $this->Form->end(__('Submit')); ?>
This is the view. which contain the field for typology (item_id|title|description|thumbnial|typology_category_id|typology_condition_id)
and the field for typologypictures (pic_path)
The controller (that is at TypologyPicturesController) is:
public function edit($id = null) {
if (!$this->TypologyPicture->exists($id)) {
throw new NotFoundException(__('Invalid typology picture'));
}
if ($this->request->is(array('post', 'put'))) {
if(empty($this->data['TypologyPicture']['pic_path']['name'])){
unset($this->request->data['TypologyPicture']['pic_path']);
}
if ($this->TypologyPicture->saveAll($this->request->data)) {
$this->Session->setFlash(__('The typology picture has been saved.'));
return $this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash(__('The typology picture could not be saved. Please, try again.'));
}
} else {
$options = array('conditions' => array('TypologyPicture.' . $this->TypologyPicture->primaryKey => $id));
$this->request->data = $this->TypologyPicture->find('first', $options);
$opt = array('conditions' => array('Typology.id' => $this->request->data['TypologyPicture']['typology_id']));
$this->request->data = $this->Typology->find('first', $opt);
}
if ( AuthComponent::user('role')==='admin' ||AuthComponent::user('role')==='superadmin' ){ //if the user is admin or superadmin, show all on dropdown
$items = $this->Typology->TypologyItem->find('list');
} else {// else if the user is author, show only item created by him.
$items = $this->Typology->TypologyItem->find('list', array('conditions' => array('TypologyItem.user_id' => AuthComponent::user('id'))));
}
$typologyCategories = $this->Typology->TypologyCategory->find('list');
$typologyConditions = $this->Typology->TypologyCondition->find('list');
$users = $this->Typology->TypologyUser->find('list');
$this->set(compact('items', 'typologyCategories', 'typologyConditions', 'users'));
if ( AuthComponent::user('role')==='admin' ||AuthComponent::user('role')==='superadmin' ){
$typologies = $this->TypologyPicture->ItemTypologyPicture->find('list');
} else {
$typologies = $this->TypologyPicture->ItemTypologyPicture->find('list', array('conditions' => array('ItemTypologyPicture.user_id' => AuthComponent::user('id'))));
}
$this->set(compact('typologies'));
}
And when i try to edit, it opens the form, the fields are filled properly, but wheni press save there is new row inserted at typologyPicture and no change at all to Typology.
So what i want is that when the user press submit only the correspondings rows are updated and not to insert new rows.....