some metaprogramming with define_method

[Philipp Hofmann]

Hello,

I was hoping that the following snippet would output

test_method

instead it raises an 'undefined method'.


module Proxy

def self.append_features(mod)
mod.extend(ClassMethods)
end

module ClassMethods

def proxy_method(name)
self.class.senddefine_method, name) { puts "called #{name}" }
end

end

end

class ProxyTest

include Proxy

proxy_method :test_method

end

proxy = ProxyTest.new
proxy.test_method


Any hints greatly appreciated.
g phil

 

[Mikael Høilund]

Hello,

I was hoping that the following snippet would output

test_method

instead it raises an 'undefined method'.


module Proxy

def self.append_features(mod)
mod.extend(ClassMethods)
end

module ClassMethods

def proxy_method(name)
self.class.senddefine_method, name) { puts "called #{name}" }

Here you're in class scope; self points to ProxyTest. You in essense
defined Class.test_method. Remove ".class", and it works.