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UPGRADE FROM 2.1 to 2.2

A block context is now implemented, see the change in BlockServiceInterface:

    * BlockServiceInterface

         /**
    -     * Returns the default settings link to the service
    +     * Define the default options for the block
          *
    -     * @return array
    +     * @param OptionsResolverInterface $resolver
          */
    -    public function getDefaultSettings();
    +    public function setDefaultSettings(OptionsResolverInterface $resolver);


So to update, just use the ``OptionsResolverInterface`` API as the Form Component:

    -    public function getDefaultSettings()
    +    public function setDefaultSettings(OptionsResolverInterface $resolver)
         {
    -        return array(
    -            'url'     => false,
    -            'title'   => 'Insert the rss title'
    -        );
    +        $resolver->setDefaults(array(
    +            'url'      => false,
    +            'title'    => 'Insert the rss title',
    +            'template' => 'SonataBlockBundle:Block:block_core_rss.html.twig',
    +        ));
         }

The template is now a mandatory parameter (which can be set to false), so the ``execute`` method should like:

    -    public function execute(BlockInterface $block, Response $response = null)
    +    public function execute(BlockContextInterface $blockContext, Response $response = null)
         {
    -        $settings = array_merge($this->getDefaultSettings(), $block->getSettings());
    -
    -        return $this->renderResponse('SonataBlockBundle:Block:block_core_text.html.twig', array(
    -            'block'     => $block,
    -            'settings'  => $settings
    +        return $this->renderResponse($blockContext->getTemplate(), array(
    +            'block'     => $blockContext->getBlock(),
    +            'settings'  => $blockContext->getSettings()
             ), $response);
         }


The twig template helper sonata_block_render has been updated:

    sonata_block_render(block, use_cache, extra_cache_key)

        => sonata_block_render(block, {'use_cache': use_cache, 'extra_cache_key': extra_cache_key})


If you are using the page bundle you need to configure the ``context_manager`` section

    sonata_block:
        context_manager: sonata.page.block.context_manager
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