Feature #8027: add the possibility to raise an exception in #included, #extended, #prepended, #inherited and break the calling feature

• Status: Feedback
• Assignee: -
• Target version: -

[Hanmac (Hans Mackowiak)]

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

[semaperepelitsa (Simon 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.

[Hanmac (Hans Mackowiak)]

ah good to know, but not the best way. What if i want that a Module is extendable but not includable? Then append_features may not what i want

[zzak (zzak _)]

• Status changed from Open to Feedback