Rails Routing based on Parameters

Question

I am working on a Rails app, and I am looking for a way to route to different actions in the controller based on the existence of parameters in the url.

For example I want website.com/model to route to model#index, however I want website.com/model?opt=dev to route to model#show. Is there some way this can be done?

I believe you can use the :constraints option to get this behavior. Documentation: guides.rubyonrails.org/routing.html#segment-constraints. — MurifoX
– MurifoX, Commented Jun 29, 2012 at 19:17

smitjel · Accepted Answer · 2012-06-29 19:33:30Z

4

Use route constraints to look at the request object and see if it has URL parameters. If you're using restful routes, you want to put this "one-off" before the restful route. Something like this:

get 'users' => 'users#show', constraints: { query_string: /.+/ }
resources :users

So what this is saying is that if you request "/users?opt=dev" then it will match your special case. Otherwise, it falls through to your normal restful route to the index action. Your model#show action will then have to know to pick up the param[:opt] and do whatever with it.

Also, note that the regex is very loose and it's simply checking for ANY param...you'll want to tighten that up to fit whatever you're trying to do.

edited Jun 29, 2012 at 19:33

answered Jun 29, 2012 at 19:26

smitjel

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2 Comments

finiteloop Over a year ago

Ah, good answer. I had gotten as far as trying to use constraints, but I didn't know about the query_string. What is contained in this? How can I use this to look for specific things such as opt or other options. My use case requires me to distinguish between different things such as opt, email, etc.

smitjel Over a year ago

The query_string is part of the request object. It's literally everything after the "?" in the URL. The example I posted is, like I said, is using a very general regex. If you need more logic than a simple regex, I'd probably put this in the controller and not the routes for maintainability reasons.

myagi · Accepted Answer · 2013-03-15 06:59:56Z

2

Not strictly the same, but if you came to this post and were wondering how to do the same via a POST, then you can do it based on the request_paramters.

for your routes.rb ..

module MyConstraintName  
extend self
  def matches?(request)
    request.request_parameters["routeFlag"] == "routeToModelShow"
  end
end

match "pages/:id", :via=>:post, :controller=>"model", :action=>"show",  :constraints => MyConstraintName

and in your form for example..

<%= hidden_field_tag :routeFlag, "routeToModelShow" %>

answered Mar 15, 2013 at 6:59

myagi

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