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Add an explanation about «constraints» validation #7664

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Add an explanation about «constraints» validation
chindit Mar 22, 2017
6d2a1e4
Rewords and minor fixes
javiereguiluz Mar 22, 2017
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23 changes: 23 additions & 0 deletions validation.rst
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Expand Up @@ -449,6 +449,29 @@ If you're ever unsure of how to specify an option, either check the API document
for the constraint or play it safe by always passing in an array of options
(the first method shown above).

Constraints in Form Classes
---------------------------

Constraints can be defined while building the form via the ``constraints`` option
of the form fields::

public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('myField', TextType::class, array(
'required' => true,
'constraints' => array(new Length(array('min' => 3)))
))
}

The ``constraints`` option is only available when adding the ValidatorExtention
to the formBuilder::

Forms::createFormFactoryBuilder()
->addExtension(new ValidatorExtension(Validation::createValidator()))
->getFormFactory()
;

.. index::
single: Validation; Constraint targets

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