fix: Optimize route generation in rfc6570_route/s helper

The #rfc6570_routes helper directly delegates to #to_rfc6570 on the
named routes collection now, avoiding manual iteration and an extra
lookup via #rfc6570_route.

Otherwise, both methods the context-local #_routes method now, instead
of Rails.application.routes, which eases testing. New helper specs
verify both method in detail now too.

Author: jgraichen

lib/rails/rfc6570.rb

@@ -88,16 +88,11 @@ def to_rfc6570(**opts)
 
     module Helper
       def rfc6570_routes(**opts)
-        routes = {}
-        Rails.application.routes.named_routes.names.each do |key|
-          routes[key] = rfc6570_route(key, **opts)
-        end
-
-        routes
+        _routes.named_routes.to_rfc6570(**opts, ctx: self)
       end
 
       def rfc6570_route(name, **opts)
-        route = Rails.application.routes.named_routes[name]
+        route = _routes.named_routes[name]
         raise KeyError.new "No named routed for `#{name}'." unless route
 
         route.to_rfc6570(**opts, ctx: self)
@@ -120,7 +115,7 @@ def rfc6570_params_for(defs)
 
     def params_for(controller, action)
       ctr = "#{controller.camelize}Controller".constantize
-      ctr.rfc6570_defs[action.to_sym] if ctr.respond_to?(:rfc6570_defs)
+      ctr.rfc6570_params_for(action.to_sym) if ctr.respond_to?(:rfc6570_params_for)
     rescue NameError
       nil
     end

spec/rails/rfc6570/helper_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Rails::RFC6570::Helper do
+  subject(:helper) do
+    routes = self.routes
+
+    Class.new do
+      def url_options
+        {host: 'www.example.org'}
+      end
+
+      include routes.url_helpers
+      include Rails::RFC6570::Helper
+    end.new
+  end
+
+  let(:routes) do
+    ActionDispatch::Routing::RouteSet.new.tap do |routes|
+      routes.draw do
+        get '/path/:id', to: 'controller#action', as: :test1
+      end
+    end
+  end
+
+  describe '#rfc6570_routes' do
+    it 'returns dictionary of all named routes' do
+      expect(helper.rfc6570_routes).to eq({
+        test1: Addressable::Template.new('http://www.example.org/path/{id}'),
+      })
+    end
+  end
+
+  describe '#rfc6570_route' do
+    it 'returns template for named route' do
+      expect(helper.rfc6570_route(:test1)).to eq Addressable::Template.new('http://www.example.org/path/{id}')
+    end
+
+    it 'raise KeyError with unknown named route' do
+      expect { helper.rfc6570_route(:not_found) }.to raise_error KeyError
+    end
+  end
+end