UPGRADE FROM 4.1 to 4.2

Cache

Deprecated CacheItem::getPreviousTags(), use CacheItem::getMetadata() instead.

Form

Deprecated calling FormRenderer::searchAndRenderBlock for fields which were already rendered. Instead of expecting such calls to return empty strings, check if the field has already been rendered.

Before:

{% for field in fieldsWithPotentialDuplicates %}
   {{ form_widget(field) }}
{% endfor %}

After:

{% for field in fieldsWithPotentialDuplicates if not field.rendered %}
   {{ form_widget(field) }}
{% endfor %}

Config

Deprecated constructing a TreeBuilder without passing root node information.

Security

Using the has_role() function in security expressions is deprecated, use the is_granted() function instead.
Not returning an array of 3 elements from FirewallMapInterface::getListeners() is deprecated, the 3rd element must be an instance of LogoutListener or null.
Passing custom class names to the Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolver to define custom anonymous and remember me token classes is deprecated. To use custom tokens, extend the existing Symfony\Component\Security\Core\Authentication\Token\AnonymousToken or Symfony\Component\Security\Core\Authentication\Token\RememberMeToken.

SecurityBundle

Passing a FirewallConfig instance as 3rd argument to the FirewallContext constructor is deprecated, pass a LogoutListener instance instead.
Using the security.authentication.trust_resolver.anonymous_class and security.authentication.trust_resolver.rememberme_class parameters to define the token classes is deprecated. To use custom tokens extend the existing AnonymousToken and RememberMeToken.

DoctrineBridge

The lazy attribute on doctrine.event_listener tags was removed. Listeners are now lazy by default. So any lazy attributes can safely be removed from those tags.

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