Redirect to another view

You can use flash messages for this:

// Flash messages (Service definition)
$di->set('flash', function() {
    $flash = new \Phalcon\Flash\Session();
    return $flash;
});

// Controller code for example
if ($error) {
    $this->flash->error('Error message');
} else {
    $this->flash->success('Success message' );
}
return $this->response->redirect($this->request->getHTTPReferer());

So how can i get it in view?

I don't understand, just if validation failes render view from /projects/view/:id with error messages. What's a problem ?

I have a problem with understanding.

I added to service.php

$di->set('flash', function() {
    $flash = new \Phalcon\Flash\Session();
    return $flash;
});

and

class DataController extends BaseController
{
    public function saveAction()
    {
        $this->flash->error('error');
        return $this->response->redirect($this->request->getHTTPReferer());
    }
}

Redirect works good but I don't see an error.

Did you add them to your view file? Should be something like:

{% if flash.has('success') or flash.has('warning') or flash.has('notice') or flash.has('error') %}
<div id="flash-messages">
    <button type="button" class="close" onclick="$(this).parent().remove();"><i aria-hidden="true">&times;</i></button> 
    {{ flash.output() }}
</div> 
{% endif %}

Ok. I think now it's work.

View code:

<?php
    if($this->flashSession->has('success')):
    ?>
        <div class="alert alert-success alert-dismissable">
            <button aria-hidden="true" data-dismiss="alert" class="close" type="button">×</button>
            <?php echo $this->flash->output(); ?>
        </div>
    <?php
    endif;
    if($this->flashSession->has('error')):
    ?>
    <div class="alert alert-danger alert-dismissable">
        <button aria-hidden="true" data-dismiss="alert" class="close" type="button">×</button>
        <?php echo $this->flash->output(); ?>
    </div>
    <?php
    endif;
    ?>

Thanks guys.

I would just like more as user to know what i did wrong instead of just some generic message that i provided wrong data :)

Also use volt :D