Question

Sf2.0, standard blog for example.

Code of routing.yml:

DevBlogBundle_post_show:
 pattern:  /posts/{id}
 defaults: { _controller: "DevBlogBundle:Post:show" }
 requirements:
    _method:  GET
    id: \d+

Standard way i generate url for my post by using:

path('DevBlogBundle_post_show',{'id':post.id})

I use this constrution in all my temlates/layouts, which include posts list. An if i want to change my route for post_show (say… add Slug parameter /posts/{id}.{slug}), i will need to change all my temlates. Instead, i want to generate route by my Post model, something like:

public function getUrl(){
     return $this->generator->generate('DevBlogBundle_post_show',array (...params...));}

Question: How can i get This Generator to my Post model, what i have to “use …” and how to generate route?

In my templates i want to place:

<a href="{{ post.getUrl() }}" ...>...</a>

Thanks in advance.

Answer 1

Excited by this question and the thoughts in my previous comment i’ve hacked together a quick proof of concept to achieve what you where asking for. I’ve implemented a twig function that can be passed an entity and a route name. The function does the following setps to generate the url:

1. Get the route specified by name
2. Compile the route
3. Obtain the routes variables
4. Loop over variables and try to call the according getters on the entity to build up the parameters array that is required by the UrlGeneratorInterface to generate a routes url
5. Let symfony’s url generator generate the url

However this implies that the routes parameters are named exactly as the properties in the entities, which IMHO is a good practice anyway. The code needs to be places into a twig extension that has the service container reference injected into the container property.

public function generateEntityUrl($entity,$routeName)
{
    $router         = $this->container->get('router');
    $generator      = $router->getGenerator();
    $collection     = $router->getRouteCollection();
    $route          = $collection->get($routeName);
    $compiledRoute  = $route->compile();
    $variables      = $compiledRoute->getVariables();
    $parameters     = array();

    foreach($variables as $var)
    {
        $getter = 'get'.ucfirst($var);
        $parameters[$var]=$entity->$getter();
    }

    return $generator->generate($routeName,$parameters);

}

In twig you can then call the function with {{post|entity_url('DevBlogBundle_post_show')}}.

But I’m asking myself why there is no implementation yet in symfony… or why i have not found it yet.