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Speaker: Bernhard Schussek

Slides: https://speakerdeck.com/u/bschussek/p/symfony-form-tricks

Symfony2 Form Tricks

Outline

  • Intro
  • Data formats
  • Data mapping
  • Events

Today's example:

Legend: New Employee

Form   Employee:
  - Text   name
  - Money   salary
  - DateTime   birthDate
     [Choice   day, Choice   month, Choice   year]

$factory = Forms::createFormFactor();

Forms Have Names

$builder = $factory->createNamedBuilder('employee');

Data formats

  • Model data
  • View data

[text]

  • string
  • string

[number]

  • float
  • localized string

[date]

  • [string, integer, array, DateTime]
  • [string, array]
$builder->add('createdAt', 'date', array(
	'input' => 'array',
	'widget' => 'single_text'
));

CAVEAT: If you need custom data, you always have to think about data types

Normalized formal

$builder->addEventListener(FormEvents::BIND,
	function (FromEvent $event) {
// INCOMPLETE
	})

Tip

  • Whenever you create a custom type, decide:
    • Model format?
    • Normalized format?
    • View format?

Data transformation

Form:
  - model data
  - normalized data
  - view data
  • Symfony\Component\Form\DataTransformerInterface
    • bijective
    • transform($data)
    • reverseTransform($data)

Example: ChoiceOrTextType

Label: Team
Choice: Other:
Text: Type a team

[choiceortext]

  • string
  • string
  • array

Tip

The normalized data should have as trimmed down text as possible (? refer to slide)

Case 1: Existing Team Selected

Case 2: New Team Created

Check the value of "Other", if set create new team. Else, existing team.

Tip

Data transformers should never change the information stored in a form

Example: MyDateType

[mydate]

  • MyDateTime
  • [string, integer, array, DateTime]
  • DateTime
  • [array, string]

Data Mapping

Data mapping is the mapping between a form and its fields

  • Symfony\Component\Form\DataaMapperInterface
    • bijective
    • mapFormsToData($data, array $forms)
    • mapDataToForms($forms, array $data)

Implementations

  • In Symfony
    • PropertyPathMapper
  • Ideas:
    • DomDocumentMapper
    • EAVMapper

Example: Terms and Conditions

$builder->add('terms', 'checkbox', array(
	'mapped' => false,
	'data' => true,
));
$form->get('terms')->setData(true);
// MISSED

STOP

Sorry guys, he's going way too fast here. Gotta absorb it myself. Please refer to slides.