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minor #20204 3.0 Upgrade Guide: Describing how to pass data to a form through options resolver (smithandre)

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This PR was submitted for the master branch but it was merged into the 2.8 branch instead (closes #20204).

Discussion
----------

3.0 Upgrade Guide: Describing how to pass data to a form through options resolver

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #18662
| License       | MIT
| Doc PR        |

Enhanced the upgrade guide by adding details regarding passing data to a form through the options resolver.

Commits
-------

b69bd3f 3.0 Upgrade Guide: Added details describing how to pass data to a form through the options resolver
This commit is contained in:
Fabien Potencier 2016-10-14 08:11:06 -07:00
commit adf20c86fb
1 changed files with 52 additions and 0 deletions
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52
UPGRADE-3.0.md
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@ -348,6 +348,58 @@ UPGRADE FROM 2.x to 3.0
$form = $this->createForm(MyType::class);
```
* Passing custom data to forms now needs to be done
through the options resolver.
In the controller:
Before:
```php
$form = $this->createForm(new MyType($variable), $entity, array(
'action' => $this->generateUrl('action_route'),
'method' => 'PUT',
));
```
After:
```php
$form = $this->createForm(MyType::class, $entity, array(
'action' => $this->generateUrl('action_route'),
'method' => 'PUT',
'custom_value' => $variable,
));
```
In the form type:
Before:
```php
class MyType extends AbstractType
{
private $value;
public function __construct($variableValue)
{
$this->value = $value;
}
// ...
}
```
After:
```php
public function buildForm(FormBuilderInterface $builder, array $options)
{
$value = $options['custom_value'];
// ...
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'custom_value' => null,
));
}
```
* The alias option of the `form.type_extension` tag was removed in favor of
the `extended_type`/`extended-type` option.