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feature#3818 [Form customization] added block_name example. (aitboudad)

This PR was merged into the 2.3 branch.Discussion----------[Form customization] added block_name example.| Q | A| ------------- | ---| Doc fix? | yes| New docs? | no| Applies to | all|Fixed tickets |-Commits-------512d5eb [Form customization] fixed minor typose423118 [Form customization] added block_name example.

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cookbook/form
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Original file line number	Diff line number	Diff line change
@@ -660,6 +660,23 @@ field whose id is ``product_name`` (and name is ``product[name]``).
`660`	`660`	``ProductType`` equates to ``product``). If you're not sure what your
`661`	`661`	`form name is, just view the source of your generated form.`
`662`	`662`
	`663`	+ If you want to change the ``product`` or ``name`` portion of the block
	`664`	+ name ``_product_name_widget`` you can set the ``block_name`` option in your
	`665`	`+ form type::`
	`666`	`+`
	`667`	`+ use Symfony\Component\Form\FormBuilderInterface;`
	`668`	`+`
	`669`	`+ public function buildForm(FormBuilderInterface $builder, array $options)`
	`670`	`+ {`
	`671`	`+ // ...`
	`672`	`+`
	`673`	`+ $builder->add('name', 'text', array(`
	`674`	`+ 'block_name' => 'custom_name',`
	`675`	`+ ));`
	`676`	`+ }`
	`677`	`+`
	`678`	+ Then the block name will be ``_product_custom_name_widget``.
	`679`	`+`
`663`	`680`	`You can also override the markup for an entire field row using the same method:`
`664`	`681`
`665`	`682`	`..configuration-block::`

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Commitaf8c20f

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`‎cookbook/form/form_customization.rst‎`

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