Bug #15278: Refinements don't work well with Forwardable

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: 2.5.1
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN

[chucke (Tiago Cardoso)]

Refined methods become unreachable when called through def_delegator.

require "forwardable"

module URIExtensions
  refine URI::Generic do
    def authority
      port_string = port == default_port ? nil : ":#{port}"
      "#{host}#{port_string}"
    end

    def origin
      "#{scheme}://#{authority}"
    end
  end
end

using URIExtensions

class Container
  extend Forwardable
  def_delegator :@uri, :origin
  def_delegator :@uri, :authority

  def initialize(uri)
    @uri = uri
  end
end


u = URI("https://google.com")
container = Container.new(u)
puts container.origin
puts container.authority

[matz (Yukihiro Matsumoto)]

• Status changed from Open to Closed

It's intentional. Refinement is lexical overriding of methods. That means refined methods (e.g. origin in this case) are not called from delegators.

Matz.