Symfony day 2016

Samuele Lilli - DonCallisto
Rome, 28 October 2016
A journey into Symfony form component

WHO AM I?

Samuele Lilli
DonCallisto

Backend developer @
website: www.madisoft.it
tech blog: labs.madisoft.it

WE ARE HIRING!
(wanna join? ask us at the end of the talk or visit our website)

My first talk

https://joind.in/talk/5a6bd

FORM COMPONENT
(http://www.freepik.com/free-photos-vectors/smile - Smile vector designed by Freepik)

FORM COMPONENT
Standalone component (install it via composer/packagist or github)

FORM COMPONENT
Provides twig facilities for render labels/fields/errors

FORM COMPONENT
Handling for you data submission (bind to entity if any, validation, data transformations, …)

FORM COMPONENT
Handling for you data submission (bind to entity if any, validation, data transformations, …)
Provides a bunch of built-in types

SUMMARY
EntityType
CollectionType
Form Data Filtering on Entity / Collection
Form Events
Form Data Types
Data Transformers
Value Objects
Property Path

ENTITY
TYPE

Use EntityType when you want list
or “associate” one or more
entities to another

class Product
{
// ….
/**
* @ORMManyToMany(targetEntity="Category",inversedBy="products")
*/
protected $categories;
class Category
{
// ….
/**
*@ORMManyToMany(targetEntity="Product",mappedBy="categories")
*/
protected $products;

class Product
{
// ….
/**
* @ORMManyToMany(targetEntity="Category",inversedBy="products")
*/
protected $categories;
class Category
{
// ….
/**
*@ORMManyToMany(targetEntity="Product",mappedBy="categories")
*/
protected $products;
OWNING SIDE
INVERSED SIDE

class Category
{
// ….
public function addProduct(Product $product)
{
$this->products[] = $product;
return $this;
}
public function removeProduct(Product $product)
{
$this->products->removeElement($product);
}

class CategoryType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', TextType::class)
->add('products', EntityType::class, [
'class' => Product::class,
'multiple' => true,
'required' => false,
]);
}
//….

Products are not associated to categories

http://stackoverflow.com/questions/9102063/symfony2-doctrine2-many-to-many-form-not-saving-entities

That should not be the right answer
Never bend your needs to software limits (unless strictly necessary)
Doctrine looks only for changes ONLY on the owning side of association, so those
adds will not take place.
Take care yourself for data consistency (during objects lifecycle, ensure that all
references are setted well in both sides). This concept is not ORM-related.
We didn’t add by_reference => false into into FormType.

Data consistency
Class Product
{
// ….
public function addCategory(Category $category)
{
if (!$this->categories->contains($category)) {
$this->categories[] = $category;
$category->addProduct($this);
}
return $this;
}
public function removeCategory(Category $category)
{
if ($this->categories->contains($category)) {
$this->categories->removeElement($category);
$category->removeProduct($this);
}
}
Class Category
{
// ….
public function addProduct(Product $product)
{
if (!$this->products->contains($product)) {
$this->products[] = $product;
$product->addCategory($this);
}
return $this;
}
public function removeProduct(Product $product)
{
if ($this->products->contains($product)) {
$this->products->removeElement($product);
$product->removeCategory($this);
}
}

This should not be the right answer
Never bend your needs to software limits (unless strictly necessary)
Doctrine looks only for changes ONLY on the owning side of association, so those
adds will not take place. √
Take care yourself for data consistency (during objects lifecycle, ensure that all
references are setted well in both sides). This concept is not ORM-related. √
We didn’t add by_reference => false into into FormType.

{
$builder
->add('name', TextType::class)
->add('products', EntityType::class, [
'class' => Product::class,
'multiple' => true,
'required' => false,
'by_reference' => false,
]);
}
by_refence => false

WHY BY_REFERENCE => FALSE
It forces setter (adder) to be called on the parent element
As a rule of thumb, set ALWAYS by_reference to false when dealing
with objects (ArrayCollection included)

BY_REFERENCE => TRUE
Name
Cat.
Name
Name
Name
$cat->getProducts()->get{0}->setName(‘bar’);
$cat->getProducts()->get{1}->setName(‘foobar’);
$product3 = new Product();
$product3->setName();
$cat->getProducts()->add($product3);
$cat->setName(‘foo’);

BY_REFERENCE => FALSE
Name
Cat.
Name
Name
Name
$cat->getProducts()->get{0}->setName(‘bar’);
$cat->getProducts()->get{1}->setName(‘foobar’);
$product3 = new Product();
$product3>setName();
$cat->addProduct($product3);
$cat->setName(‘foo’);

COLLECTION
TYPE

Use CollectionType when you want
to embed a collection of forms or
add/remove directly elements
from collection

Class User
{
/**
* @ORMOneToMany(targetEntity="Ticket", mappedBy="user", cascade={"persist"})
*/
protected $tickets;
public function addTickets(Ticket $ticket)
{
if (!$this->tickets->contains($ticket)) {
$this->tickets[] = $ticket;
$ticket->setUser($this);
}
return $this;
}
public function removeTicket(Ticket $ticket)
{
$this->tickets->removeElement($ticket);
}

$builder
->add('username', TextType::class)
->add(tickets, CollectionType::class, [
'entry_type' => TicketType::class,
'allow_add' => true,
'allow_delete' => true,
'prototype' => true,
'by_reference' => false,
]);
UserType

Element not deleted!

Inthecourtofthecrimsonking-kingcrimson(1969)

Two possible solutions
“Manually” (programmatically) remove elements
Set orphanRemoval to true on the attribute
If the relationship was ManyToMany and User was
the owning side, no troubles

“Manually” (programmatically) remove elements
$originalTickets = new ArrayCollection();
foreach ($user->getTickets() as $ticket) {
$originalTickets->add($ticket);
}
if ($this->isFormSubmittedAndValid($form, $request)) {
foreach ($originalTickets as $originalTicket) {
if (!$user->getTickets()->contains($originalTicket)) {
$em->remove($originalTicket);
}
}
}

/**
* @ORMOneToMany(targetEntity="Ticket", mappedBy="user", cascade={"persist"}, orphanRemoval=true)
*/
protected $tickets;
NOT RECOMMENDED

http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-associations.html

public function passTicketsAction(User $yelding, User $beneficiary)
{
foreach ($yelding->getTickets() as $ticket) {
$yelding->removeTicket($ticket);
$beneficiary->addTicket($ticket);
}
}

public function passTicketsAction(User $yelding, User $beneficiary)
{
foreach ($yelding->getTickets() as $ticket) {
$beneficiary->addTicket($ticket);
// OR → $ticket->setUser($beneficiary);
}
}

FORM DATA
FILTERING
(for entity and collection type)

EntityType
USE built-in queryBuilder option
{
$builder
->add(‘foo’, EntityType::class, [
// ….
‘queryBuilder’ => function (FooRepo $fooRepo) {
return $fooRepo->filterFunction();
}
]);
}

CollectionType
CollectionType does not have any queryBuilder option
Declare form as a service an inject repository (entity manager)
This is the preferred way if you need the repo
Pass repository as an option
Usually, options are used for what you cannot inject into service

EntityManager injection
public function __construct(EntityManager $em)
{
$this->fooRepo = $em->getRepository(Foo::class);
}
{
$builder->add(‘foo’, CollectionType::class, [
// ….
'data' => $this->fooRepo->filterFunction()
]);
}

EntityManager as an option
{
$fooRepo = $options[‘fooRepo’];
$builder->add(‘foo’, CollectionType::class, [
// ….
'data' => $fooRepo>filterFunction()
]);
}

Is repository the only way to filter data?
Do I need to create a repository on purpose?

NO

What if I need to access entity getters
for filter operations?

FORM
EVENTS
(overview)

->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $e) {
/** @var $data User */
$data = $e->getData();
$form = $e->getForm();
$today = new DateTime();
$criteria = Criteria::create()
->where(Criteria::expr()->gte('date', $today));
$form->add('tickets', CollectionType::class, [
// ….
'data' => $data->getTickets()->matching($criteria)
]);
});
});
FORM EVENTS

/**
* @ORMOneToMany(targetEntity="Ticket", mappedBy="user", cascade={"persist"}, orphanRemoval=true)
*/
protected $tickets;
● All tickets (entities) filtered out in the event will be
removed!
● Remove orphanRemoval option from the attribute and
handle collection yourself
FORM EVENTS

FORM EVENTS
$form = $this->createForm(UserType::class, $user);
$originalTickets = new ArrayCollection();
foreach ($form->get('tickets')->getData() as $ticket) {
$originalTickets->add($ticket);
}
if ($this->isFormSubmittedAndValid($form, $request)) {
foreach ($originalTickets as $originalTicket) {
if ($user->getTickets()->contains($originalTicket)) {
continue;
}
$em->remove($originalTicket);
}

PRE_SET_DATA POST_SET_DATA
CONTROLLER
VIEW
NEW FORM
RENDER
FORM CREATION

PRE_SET_DATA POST_SET_DATA
CONTROLLER
VIEW
NEW FORM
BIND
FORM POST
POST
PRE_SUBMIT SUBMIT POST_SUBMIT
IS VALID
PERSIST

TIP
Every group of events it’s called from START to
END on every FORM. This means that if you
have a chain of embedded form, all events are
called starting from innermost forms, going up
to parent form, ending on top form

BECAUSE OF THIS

NEVER SET
PARENT DATA
FROM CHILD FORM

EVER!

DATA TYPES

DATA TYPES
MODEL DATA
NORM DATA
VIEW DATA

MODEL DATA
Main data type of PRE_SET_DATA and POST_SET_DATA
Reppresent data of underlying object. In previous example with
product form, product field model data is a Product object.
If field type is the same of underlying data, NORM DATA will be the
same of MODEL DATA
If field type is not the same of underlying data, you must use
ModelTransformer to transform MODEL DATA into NORM DATA
and vice versa (Don’t worry, we will talk about transformers next!)

NORM DATA
Main data type of SUBMIT event
Reppresent data after normalization. Commonly not used directly.
If on MODEL DATA is not present any ModelTransform, this is the
same of MODEL DATA and so the same of underlying object.
If NORM DATA isn’t the same of view reppresentation, you must use
ViewTransformer to transform NORM DATA into VIEW DATA and
vice versa

VIEW DATA
Main data type of POST_SUBMIT event
Reppresent data presented to the View. It’s the data type that you
get when you post the form.
If on VIEW DATA is not present any ViewTransformer, this is the
same of NORM DATA.

DATA
TRANSFORMERS

MODEL
TRANSFORMER

ENTITY
MODEL DATA NORM DATA
MODEL TRANSFORMER
NEW FORM BIND
TRANSFORM
REVERSE
TRANSFORM

ENTITY
MODEL DATA NORM DATA
NEW FORM BIND
TRANSFORM
REVERSE
TRANSFORM
MODEL TRANSFORMER

ENTITY - MODEL DATA
/**
* @ORMColumn(type="array", nullable=true)
*/
protected $tags;

FORM FIELD
$builder->add('tags', TextType::class)

Since model data (array) is
different from norm data (text)
we need a model transformer

$builder->add('tags', TextType::class);
$builder->get(‘tags’)->addModelTransformer(...);
FORM FIELD

TRANSFORM
public function transform($tagsArray)
{
// transform the array to string
if (null === $tagsArray) {
return '';
}
return implode(',', $tagsArray);
}

public function reverseTransform($tagsString)
{
// transform the string back to an array
if (!$tagsString) {
return [];
}
return explode(',', $tagsString);
}
REVERSE TRANSFORM

VIEW
TRANSFORMER

VIEW
NORM DATA VIEW DATA
CREATE VIEWPOST
TRANSFORM
REVERSE
TRANSFORM
VIEW TRANSFORMER

DATE TYPE (TRANSFORM)
// Transforms a normalized date into a localized date string/array)
public function transform($dateTime)
{
if (null === $dateTime) {
return '';
}
if (!$dateTime instanceof DateTimeInterface) {
throw new TransformationFailedException('Expected a DateTimeInterface.');
}
$value = $this->getIntlDateFormatter()->format($dateTime->getTimestamp());
if (intl_get_error_code() != 0) {
throw new TransformationFailedException(intl_get_error_message());
}
return $value;
}

// Transforms a localized date string/array into a normalized date.
public function reverseTransform($value)
{
if (!is_string($value)) {
throw new TransformationFailedException('Expected a string.');
}
if ('' === $value) {
return;
}
$timestamp = $this->getIntlDateFormatter()->parse($value);
// ….
try {
$dateTime = new DateTime(sprintf('@%s', $timestamp));
} catch (Exception $e) {
throw new TransformationFailedException($e->getMessage(), $e->getCode(), $e);
}
// ….
return $dateTime;
}
DATE TYPE ( REVERSE TRANSFORM)

FORM
EVENTS
(reprise)

PRE SET DATA EVENT
Modify data given during pre-population.
Don’t modify form data directly but modify event data instead.
Add/Remove form fields
USED FOR
EVENT DATA
MODEL DATA

/** @var $data User */
$data = $e->getData(); // ← MODEL DATA
$form = $e->getForm();
$today = new DateTime();
$criteria = Criteria::create()
->where(Criteria::expr()->gte('date', $today));
$form->add(‘tickets’, CollectionType::class, [
// ….
'data' => $data->getTickets()->matching($criteria)
]);
});
});
PRE_SET_DATA

if ($e->getData()->canHandleMail()) { // ← MODEL DATA
$e->getForm()->add(‘email’, EmailType::class);
}
});
});
PRE_SET_DATA

Read pre-populated form data
Don’t remove fields that you’ve setted “statically” on form
building process. Use PRE_SET_DATA and implement the logic
about fields. One exception: you are extending from a parent
form where you cannot control yourself the logic.
USED FOR
EVENT DATA
MODEL DATA
POST SET DATA EVENT

class FooType extends BarType
{
// ….
// email field added in BarType
->addEventListener(FormEvents::POST_SET_DATA, function (FormEvent $e) {
if (!$e->getData()->canHandleMail()) { // ← MODEL DATA
$e->getForm()->remove(‘email’);
}
});
});
POST_SET_DATA

Change data from the request
Add/Remove form fields
USED FOR
EVENT DATA
REQUEST DATA (ARRAY)
PRE SUBMIT EVENT

private $canModifyEmail = true;
$this->canModifyEmail = $e->getData()->canModifyEmail();
$e->getForm()->add(‘email, EmailType::class, [
// ….
‘attr’ => [ ‘disabled’ => !$this->canModifyEmail ],
]);
})
->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $e) {
if (!$this->canModifyEmail) {
$e->getForm()->remove(‘email’);
}
});
});
PRE_SUBMIT

Modify NormData
No real example will be showed
EVENT DATA
NORM DATA
SUBMIT EVENT
USED FOR

Fetch data after denormalization
Even if faster to read “final” data here, don’t implement any
business logic → hard to test and break SRP.
If you need to modify model data, do it elsewhere just after isValid
call.
USED FOR
EVENT DATA
VIEW DATA
POST SUBMIT EVENT

POST SUBMIT
$builder->addEventListener(FormEvents::POST_SUBMIT, function (FormEvent $event) use ($handler) {
$delete = $event->getForm()->has('delete') ? $event->getForm()->get('delete')->getData() : false;
$entity = $event->getForm()->getParent()->getData();
if (!$delete) {
return;
}
$handler->remove($entity, $event->getForm()->getName());
});
Vichuploader-bundle

VALUE
OBJECTS

Two object are equal if their
all fields are equal, not
necessary if they are the
same object

NO SETTERS

CONSTRUCTOR

Class FooBar
{
private $foo;
private $bar;
public function __construct($foo, $bar)
{
$this->foo = $foo;
$this->bar = $bar;
}
public function getFoo(){ … }
public function getBar(){ … }
}

Class FooBarType extends AbstractType
{
{
$builder
->add(‘foo’)
->add(‘bar’);
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
‘empty_data’ => function (FormInterface $interface) {
return new FooBar($interface->get(‘foo’)->getData(), $interface->get(‘bar’)->getData());
},
]);
}
}

PROPERTY
PATH

Class User
{
//….
/*
* @ORMOneToOne(targetEntity=”Address”, inversedBy=”user”)
*/
protected $address;
//….
}

Class Address
{
//….
/**
* @ORMOneToOne(targetEntity=”User”, mappedBy=”address”)
*/
protected $user;
/**
* @ORMColumn(type=”string”)
*/
protected $street;
/**
* @ORMColumn(type=”string”)
*/
protected $number;
}

DON’T CREATE AN
EMBEDDED FORM ON
PURPOSE

DON’T USE
UNMAPPED FIELDS
AND FORM EVENTS

USE PROPERTY PATH!

Class UserType extends AbstractType
{
{
// ….
$builder
->add(‘street’, TextType::class, [‘property_path’ => ‘address.street’])
->add(‘number’, TextType::class, [‘property_path’ => ‘address.number’]);
}
}

THANK YOU

Symfony day 2016

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