Docs/fix for rails 6.0

README.md

@@ -60,14 +60,18 @@ From there, you can create a `./packs` folder and structure it using the convent
 If you wish to use a different directory name, eg `components` instead of `packs`, you can customize this by configuring `packs.yml`. See [`packs`](https://github.com/rubyatscale/packs) for more information.
 
 ### Splitting routes
-`packs-rails` allows you to split your application routes for every pack. You just have to create a file describing your routes and then `draw` them in your root `config/routes.rb` file.
+`packs-rails` allows you to split your application routes for every pack. You just have to create a file describing your routes and then `draw` them in your root `config/routes.rb` file (NOTE: the `draw` function is only in Rails 6.1+).
 
 ```ruby
 # packs/my_domain/config/routes/my_domain.rb
-resources :my_resource
+Rails.application.routes.draw do
+  resources :my_resource
+end
 
 # config/routes.rb
-draw(:my_domain)
+Rails.application.routes.draw do
+  draw(:my_domain)
+end
 ```
 
 ### Making your Package an Engine

lib/packs/rails/integrations/rails.rb

@@ -27,6 +27,10 @@ def create_engines
         def inject_paths
           Packs.all.reject(&:is_gem?).each do |pack|
             Packs::Rails.config.paths.each do |path|
+              # Example case: in rails 6.0, the "config/routes" app path is nil and was not added until
+              # https://github.com/rails/rails/pull/37892/files#diff-a785e41df3f87063a8fcffcac726856a25d8eae6d1f9bca2b36989fe88613f8eR62
+              next unless @app.paths[path]
+
               @app.paths[path] << pack.relative_path.join(path)
             end
           end