Issue #19079 has been updated by Hanmac (Hans Mackowiak). you can also try prepend instead of include: ```ruby WithHelper = DelegateClass(Base) { prepend Helper } ``` ---------------------------------------- Bug #19079: Modules included in a DelegateClass cannot override delegate methods https://bugs.ruby-lang.org/issues/19079#change-100407 * Author: jonathanhefner (Jonathan Hefner) * Status: Rejected * Priority: Normal * ruby -v: ruby 3.1.2p20 * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- Because `DelegateClass` defines delegate methods on the class itself, those delegate methods come first in the method lookup chain. This prevents included modules from overriding delegate methods: ```ruby Base = Class.new do def foo "base" end end Helper = Module.new do def foo "helper" end end WithHelper = DelegateClass(Base) { include Helper } WithHelper.new(Base.new).foo # => "base" ``` One possible solution would be to define the delegate methods in a separate module. That way, other modules could come before it in the method lookup chain. -- https://bugs.ruby-lang.org/