Sinatra human and api routes

gistfile1.rb

module App
  class Users < App::Base
    
    use Rack::Parser
    
    helpers do
      def cycle
        @cycle ||= %w{odd even}.cycle
      end
    end
    
    before provides: :html do
      env['warden'].authenticate!
    end
    
    before provides: :json do
      env['warden'].authenticate! scope: :api
    end
    
    before %r{^/(?<id>\d+)} do
      not_found unless @user = User[params[:id]]
    end
    
    # index
    get '/', provides: :html do
      slim :'users/index', locals: { users: User.all }
    end
    
    get '/', provides: :json do
      MultiJson.encode(User.all.map {|user| user.values })
    end

    # new
    get '/new' do
      slim :'users/new'
    end

    # create
    post '/' do
      @user = User.create(params[:user])
      pass
    end
    
    post '/', provides: :html do
      redirect to "/#{@user.id}"
    end
    
    post '/', provides: :json do
      headers \
        'Location' => url("/#{@user.id}"),
        'Content-Location' => url("/#{@user.id}")
      status 201
      MutiJson.encode(@user.values)
    end

    # read
    get '/:id', provides: :html do
      slim :'users/show', locals: { user: @user }
    end
    
    get '/:id', provides: :json do
      MultiJson.encode(@user.values)
    end

    # edit
    get '/:id/edit' do
      slim :'users/edit', locals: { user: @user }
    end

    # update
    put '/:id' do
      @user.update(params[:user])
      pass
    end
    
    put '/:id', provides: :html do
      redirect to "/#{@user.id}"
    end
    
    put '/:id', provides: :json do
      204
    end

    # destroy
    delete '/:id' do
      halt 403 unless @user.destroy
      pass
    end
    
    delete '/:id', provides: :html do
      redirect to '/'
    end
    
    delete '/:id', provides: :json do
      204
    end
    
    # errors
    error Sequel::ValidationFailed, Sequel::HookFailed do
      422
    end
    
  end
end

It would be possible to create something like InheritedResource from this. You could just inherit from this and make the model pluggable. Also, you could use respond_with.