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@notahat
Last active August 29, 2015 14:11
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Private classes in Ruby, version 2
module PrivateClass
def self.included(mod)
*parent, child = mod.name.split("::")
Object.const_get(parent.join("::")).private_constant(child)
end
end
module Container
class PublicThing
def hello
PrivateThing.new.hello
end
end
class PrivateThing
include PrivateClass # Mark this class as private at the top, not the bottom.
def hello
"Hello, world!"
end
end
# private_constant :PrivateThing <-- Normally you'd have to do this.
end
p Container::PublicThing.new.hello # => "Hello, world!"
p Container::PrivateThing.new.hello # => NameError!
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