How to get url segment params from a given url outside of a controller in Rails?

Question

Given a path such as

/foos/123

and a route

get '/foos/:id', as: 'foos'

How to get the ID using Rails routes (reverse) look up?

In this example, path.split('/').last would work, and a regex would be better. But how to use the Rails routes to do it?

This functionality was provided by Rails.application.routes.recognize_path but has been deprecated.

Note: This not part of a controller. Please do not answer about how to use routes within a controller.

Rails 6.

I don't think recognize_path was ever part of the public API and meant to be used. Maybe I'm wrong, but since this was deprecated I don't think there is other way than you just described with parsing raw URL/pah. Great question, up. — radubogdan
– radubogdan, Commented Dec 11, 2019 at 5:53
You have told us that the context is not a controller, what is it then? — max
– max, Commented Dec 11, 2019 at 11:50

max · Accepted Answer · 2019-12-11 15:48:41Z

2

You can't. Routing is actually a lot more complicated than that.

The routes are not just a simple static set of regexes that match a string to a controller and action. You need an entire request object. You have to remember that constraints put things like headers, cookies and even middleware like Warden in the picture.

Rails.application.routes.recognize_path was depreciated since it completely failed at handling this complexity. It just gave a false sense of simplicity which is probably the worst thing software can do.

answered Dec 11, 2019 at 15:48

max

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