Webmachine method override

method_override.rb

require "webmachine"

class MethodOverride < Webmachine::Resource
  def allowed_methods
    override_method!
    %w(GET PUT DELETE)
  end

  private

  def override_method!
    if request.post? && ["multipart/form-data", "application/x-www-form-urlencoded"].include?(request.headers['content-type']) && params["_method"]
      request.instance_variable_set(:@method, params["_method"].upcase)
    end
  end
  
  def params
    @params ||= Hash[URI.decode_www_form(request.body.to_s)]
  end
end