CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4routes
mahemoff
mahemoff

Reputation: 46369

Rails Routes: Programmatically extract params from a URL

I need to programmatically extract the params from a URL, ie the hash that the controller would receive if the URL was called. This is not happening inside the controller, it's for an introspection tool, so the controller is never run. I want to predict what would happen if the controller was run, hopefully using the same API Rails itself is using.

For example, given a Rails route /blogs/:id and a URL query of /blogs/123?published=true, I want to extract { id: 123, published: true }.

Using Rails.application.routes.recognize_path, I can get the id in this example as it's part of the route pattern, but not the extra CGI param (published). I could manually add those, but I'd like to know if there's a proper API for this.

Upvotes: 1

Views: 1536

Answers (2)

Harsh Gupta
Harsh Gupta

Reputation: 4538

You can parse the URL, read the query string and convert them to hash.

u = URI.parse("http://localhost:3000/blogs/213?published=true")
cgi_params = u.query.split('&').map { |e| e.split('=') }.to_h

Merge them with params that you got using Rails.application.routes.recognize_path

Upvotes: 3

Simone Carletti
Simone Carletti

Reputation: 176342

The params Hash contains all the route parameters, including the query parameters.

# Given /blogs/123?published=true
def action
  params[:id] # => 123
  params[:published] # => "true"
end

Upvotes: 1

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