From: "semaperepelitsa (Semyon Perepelitsa)" <semaperepelitsa@...>
Date: 2013-03-08T08:50:13+09:00
Subject: [ruby-core:53205] [ruby-trunk - Feature #8027] add the possibility to raise an exception in #included, #extended, #prepended, #inherited and break the calling feature


Issue #8027 has been updated by semaperepelitsa (Semyon Perepelitsa).


I think you are looking for Module.append_features:

module A
  def self.append_features(mod)
    raise "dont include me"
    super
  end
end

module E
  begin
    include A
  rescue
  end
end

p E.ancestors #=>[E]

If you don't call super it also won't be included.

----------------------------------------
Feature #8027: add the possibility to raise an exception in #included, #extended, #prepended, #inherited and break the calling feature
https://bugs.ruby-lang.org/issues/8027#change-37371

Author: Hanmac (Hans Mackowiak)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 


imo an exception in this hook methods should be possible to prevent the adding in the ancestor chain

module A
def self.included(mod)
raise "dont include me"
end
end


module E
include A
end
##>> RuntimeError: dont include me


E.ancestors #=>[E,A]
what i want:
E.ancestors #=>[E]



maybe other hook methods like method_defined should get an "prevent" option too

maybe for not breaking code we could add "before_included" where an exception could be raised


-- 
http://bugs.ruby-lang.org/