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Conflict Resolvers

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Conflict Resolvers

Conflict resolvers are invoked when the system detects that a newly generated route would conflict with a route already existing in the route repository.

This section details the conflict resolvers which are provided by default.

auto_increment

The auto_increment conflict resolver will add a numerical suffix to the path, for example if my/path already exists, it would first become my/path-1 and if that path also exists it will try my/path-2, my/path-3 and so on into infinity until it finds a path which doesn't exist.

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    stdClass:
    uri_schema: /cmf/blog
    conflict_resolver: auto_increment
  • XML
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    <auto-mapping xmlns="http://cmf.symfony.com/schema/routing_auto">
    <mapping class="stdClass" uri-schema="/cmf/blog">
        <conflict-resolver name="auto_increment" />
    </mapping>
</auto-mapping>

throw_exception

The throw_exception efficiently "resolves" conflicts by throwing exceptions. This is the default action.

  • YAML
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    stdClass:
    uri_schema: /cmf/blog
    conflict_resolver: throw_exception
  • XML
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    <auto-mapping xmlns="http://cmf.symfony.com/schema/routing_auto">
    <mapping class="stdClass" uri-schema="/cmf/blog">
        <conflict-resolver name="throw_exception" />
    </mapping>
</auto-mapping>

Creating a Custom Conflict Resolver

To create a custom conflict resolver, you have to implement ConflictResolverInterface. This interface requires a method called resolveConflict which has access to the UriContext. It returns the new route.

The following example will append a unique string to the URI to resolve a conflict:

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namespace Symfony\Cmf\Component\RoutingAuto\ConflictResolver;

use Symfony\Cmf\Component\RoutingAuto\ConflictResolverInterface;
use Symfony\Cmf\Component\RoutingAuto\UriContext;
use Symfony\Cmf\Component\RoutingAuto\Adapter\AdapterInterface;

class UniqidConflictResolver implements ConflictResolverInterface
{
    public function resolveConflict(UriContext $uriContext)
    {
        $uri = $uriContext->getUri();
        return sprintf('%s-%s', uniqid());
    }
}

Conflict resolvers should be registered as services and tagged with cmf_routing_auto.conflict_resolver:

  • YAML
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    services:
    acme_cms.conflict_resolver.foobar:
        class: Acme\CmsBundle\RoutingAuto\ConflictResolver\UniqidConflictResolver
        tags:
            - { name: cmf_routing_auto.conflict_resolver, alias: "uniqid"}
  • XML
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    <?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services">
    <service
        id="acme_cms.conflict_resolver.foobar"
        class="Acme\CmsBundle\RoutingAuto\ConflictResolver\UniqidConflictResolver"
    >
        <tag name="cmf_routing_auto.conflict_resolver" alias="uniqid"/>
    </service>
</container>
  • PHP
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    use Symfony\Component\DependencyInjection\Definition;

$definition = new Definition('Acme\CmsBundle\RoutingAuto\ConflictResolver\UniqidConflictResolver');
$definition->addTag('cmf_routing_auto.conflict_resolver', array('alias' => 'foobar'));

$container->setDefinition('acme_cms.conflict_resolver.uniqid', $definition);

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.