From: "Hanmac (Hans Mackowiak)" <noreply@ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Subject: [ruby-core:111129] [Ruby master Bug#19079] Modules included in a DelegateClass cannot override delegate methods
Date: Thu, 01 Dec 2022 14:57:39 +0000 (UTC) [thread overview]
Message-ID: <redmine.journal-100407.20221201145738.24242@ruby-lang.org> (raw)
In-Reply-To: redmine.issue-19079.20221023030106.24242@ruby-lang.org
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/
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next prev parent reply other threads:[~2022-12-01 14:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-23 3:01 [ruby-core:110483] [Ruby master Bug#19079] Modules included in a DelegateClass cannot override delegate methods jonathanhefner (Jonathan Hefner)
2022-10-23 3:02 ` [ruby-core:110484] " jonathanhefner (Jonathan Hefner)
2022-12-01 5:11 ` [ruby-core:111104] " matz (Yukihiro Matsumoto)
2022-12-01 12:38 ` [ruby-core:111126] " matz (Yukihiro Matsumoto)
2022-12-01 14:57 ` Hanmac (Hans Mackowiak) [this message]
2022-12-01 17:19 ` [ruby-core:111132] " jonathanhefner (Jonathan Hefner)
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