method

draw

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What's this?

draw(name) public

Loads another routes file with the given name located inside the config/routes directory. In that file, you can use the normal routing DSL, but do not surround it with a Rails.application.routes.draw block.

# config/routes.rb
Rails.application.routes.draw do
  draw :admin                 # Loads `config/routes/admin.rb`
  draw "third_party/some_gem" # Loads `config/routes/third_party/some_gem.rb`
end

# config/routes/admin.rb
namespace :admin do
  resources :accounts
end

# config/routes/third_party/some_gem.rb
mount SomeGem::Engine, at: "/some_gem"

CAUTION: Use this feature with care. Having multiple routes files can negatively impact discoverability and readability. For most applications â even those with a few hundred routes â it’s easier for developers to have a single routes file.

Show source

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 1621
        def draw(name)
          path = @draw_paths.find do |_path|
            File.exist? "#{_path}/#{name}.rb"
          end

          unless path
            msg  = "Your router tried to #draw the external file #{name}.rb,\n"                     "but the file was not found in:\n\n"
            msg += @draw_paths.map { |_path| " * #{_path}" }.join("\n")
            raise ArgumentError, msg
          end

          route_path = "#{path}/#{name}.rb"
          instance_eval(File.read(route_path), route_path.to_s)
        end

draw

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