artist.rb

class Artist < ActiveRecord::Base
  extend FriendlyId
  friendly_id :name, use: :finders
end

artist_controller.rb

class ArtistsController < ApplicationController
  def index
    @artists = Artist.all
  end

  def show
    @artist = Artist.find(params[:id])
  end
end

notes.md

Desired behaviour:

Route a resource where the name can be anything, including . and / charts, eg:

• ...And You Will Know Us by the Trail of Dead
• GZA/Genius

Issue

Assuming there is the model Artist.create(name: 'GZA/Genius')

Routing request to resourse

If you visit /artists/GZA%2FGenius (manually constructued/properly escaped) then app will route you to the right controller/action, and the value of params[:id] will be GZA/Genius. All is good.

Generating URL from resource

If you call artist_path for that model you'll get a UrlGenerationError:

No route matches {:action=>"show", :controller=>"artists", :id=>#<Artist id: 57, name: "GZA/Genius">} missing required keys: [:id]```

My guess is that it's trying to match the route before escaping `name`, so is trying to match a route like `/artist/GZA/Genius`, which doesn't exist.

(I'm still getting to grips with a lot of Rails, so it's not immediately clear if this is a rails, friendly id or me (likely) issue.)

routes.rb

Rails.application.routes.draw do
  constraints(id: /[^\/]+/) do
    resources :artists, only: [:index, :show] do
  end
end

If constraints is removed then it works as expected, but then artist names with a . in them, eg: /artists/...And%20You%20Will%20Know%20Us%20by%20the%20Trail%20of%20Dead, then param[:id] in the controller is .., as the rest is taken as format.