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    Routing Partials

    Episode #80 by Teacher's Avatar David Kimura

    Previous (#79) Episode Next (#81)

    Summary

    The routes file can grow to be unmaintainable and messy. Learn to keep things organized by extracting out blocks of routes into their own files.
    rails routes 4:30
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    Side Note: everyone should use caution in using instance_eval and be careful to not accept user inputs (or ensure they are sanitized). I feel that it is an acceptable use case here since only the code in the routes will call this method and it is not exposed.

    Summary

    # config/initializers/routing_draw.rb
class ActionDispatch::Routing::Mapper
  def draw(routes_name, sub_path=nil)
    if sub_path.present?
      instance_eval(File.read(Rails.root.join("config/routes/#{sub_path}/#{routes_name}.rb")))
    else
      instance_eval(File.read(Rails.root.join("config/routes/#{routes_name}.rb")))
    end
  end
end

    # routes.rb
Rails.application.routes.draw do
  draw :api
  resources :users
  root to: 'users#index'
end

    # config/routes/api.rb
require 'api_constraints'

namespace :api, compress: false do
  [:v1, :v2].map { |api| draw api, :api }
end

    # config/routes/api/v1.rb
scope module: :v1, constraints: ApiConstraints.new(version: 1, default: false) do
  resources :users
end