Setting up Rails routes based on QueryString

Question

I've seen similar questions on this, but not quite what I'm looking for... Forgetting for a moment the wisdom of doing this, is it possible to do this?...

/object/update/123?o=section    # ==> route to SectionController#update
/object/update/456?o=question   # ==> route to QuestionController#update

...and if so, how would that be done?

Answer 1

Assuming you're using Rails 3+, you can use an "Advanced Constraint" (read more about them at http://guides.rubyonrails.org/routing.html#advanced-constraints).

Here's how to solve your example:

module SectionConstraint
  extend self

  def matches?(request)
    request.query_parameters["o"] == "section"
  end
end

module QuestionConstraint
  extend self

  def matches?(request)
    request.query_parameters["o"] == "question"
  end
end

Rails.application.routes.draw do
  match "/object/update/:id" => "section#update", :constraints => SectionConstraint
  match "/object/update/:id" => "question#update", :constraints => QuestionConstraint
end

Answer 2

More concise than @moonmaster9000's answer for routes.rb only:

match "/object/update/:id" => "section#update", 
  :constraints => lambda { |request| request.params[:o] == "section" }
match "/object/update/:id" => "question#update", 
  :constraints => lambda { |request| request.params[:o] == "question" }