Symfony: Multiple money fields in one form - php

Question

Imagine you have an item entity. Within this item entity, there is a method to get the prices for that item. Prices are saved in 3 different formats: EUR, USD and GBP.
The entities would look like this:
Entity WebshopItem.php
class WebshopItem
{
/**
* #var integer
*/
private $id;
/**
* #Gedmo\Translatable
* #var string
*/
private $title;
......
/**
* #var \Doctrine\Common\Collections\Collection
*/
private $prices;
}
Entity WebshopItemPrice.php
class WebshopItemPrice
{
/**
* #var integer
*/
private $id;
/**
* #var string
*/
private $currency;
/**
* #var string
*/
private $price;
/**
* #var \WebshopItem
*/
private $webshopItem;
}
Now I would like to create a form, which contains exactly 3 input fields. For that, I thought it would be best to use the money field. So I am creating the form like this:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title')
....
->add('prices', new WebshopPricesType());
}
The webshopPricesType looks like this:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('eur', 'money', array('currency' => 'EUR', 'data_class' => 'bundlePath\Entity\WebshopItemPrice'))
->add('usd', 'money', array('currency' => 'USD', 'data_class' => 'bundlePath\Entity\WebshopItemPrice'))
->add('gbp', 'money', array('currency' => 'GBP', 'data_class' => 'bundlePath\Entity\WebshopItemPrice'));
}
3 correct fields are rendered now. I only need to fill them on edit and when saving, I have to make sure they are saved. I was thinking about using a data transformer to find the correct entity, but that's not working.
How can I make sure that all 3 fields are prefilled correctly on edit and when clicking save, the 3 prices are saved?
Or should I do it on a whole different way?
Thanks!

Answer 1

I have never been too fond of DataTransformers and therefore I would not use them here, but they can be useful.
In this particular case, I would go for FormEvents and build the form dynamically, based on the data your entity contains.
WebShopItemType
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title')
.....
->add('prices', 'collection', array(
'type' => new WebshopPricesType()
));
}
WebshopPricesType
class WebshopPricesType extends AbstractType{
.....
public function buildForm(FormBuilderInterface $builder, array $options)
{
// Dynamically build form fields, **after** the data has been set
$builder->addEventListener(FormEvents::POST_SET_DATA, function(FormEvent $event) use ($builder){
/** #var $data WebshopItemPrice **/
$data = $event->getData();
$builder->add('price', 'money', array('currency' => $data->getCurrency()));
});
}
public function setDefaults(OptionsResolverInterface $resolver){
$resolver->setDefault(array(
'data_class' => 'bundlePath\Entity\WebshopItemPrice'
));
}
.....
}
Given that, let's glue it altogether:
public class SomeController extends Controller{
public function insertAction(){
$item = new WebshopItem();
// be sure to initialize the $prices with new `ArrayCollection`
// in order to avoid NullPointerException
// Also, be sure to bind WebshopItemPrice::$item
$item
->addPrice(new WebshopItemPrice('EUR', 0))
->addPrice(new WebshopItemPrice('USD', 0))
->addPrice(new WebshopItemPrice('GBP', 0));
// this is where POST_SET_DATA gets fired
$form = $this->createForm(new WebShopItemType(), $item);
// form is ready
}
public function editAction(){
$item = ... // fetch or whatever, be sure to fetch prices as well
// this is where POST_SET_DATA gets fired
$form = $this->createForm(new WebShopItemType(), $item);
// form is ready
}
}
I have put this together in Notepad++ and I not sure if I did some typos but as far as logic is concerned - it should work ;)