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ruby on rails - Get same url structure as on Stack Overflow

A question on SO has this url structure:

http://stackoverflow.com/questions/18474799/changing-the-input-value-in-html5-datalist

If we assume that the number section is the ID, the first two sections (after the domain extension) are obtained by simply using the following in routes.rb

resources :questions

The question is already identified by it's ID, so how do we add the (optional) decorating slug in the simplest of manners? Do we need to use a new link helper (and including additional params) or can the 3-section url be resolved elsewhere?

Update:

To focus this question more on the route-handling, let's presume there is already a slug saved on the object (upon creation) as an attribute, e.g. @question.slug

It would really be an advantage if a rule in routes.rb or/and in the controller could enable and handle the optional slug, instead of having to write long link helpers in all views.

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resources :questions do
  member: title
end

for slug use friendly_id and yes don't forget to have a look at Rails Routing


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