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POHow can I "replace" a module included via ruby include function
 

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  1. POHow can I "replace" a module included via ruby include function
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    <p>As a follow up to <a href="https://stackoverflow.com/questions/2403057/how-can-i-reverse-rubys-include-function">How can I reverse ruby&#39;s include function</a>, which was well answered but turned out my simplification of the real problem mean't that the solution was not applicable.</p> <p>I'm now faced with this (names changed to protect identities!):</p> <pre><code>module OldFormHelpers def foo puts "foo" end def bar puts "bar" end end module Helpers include OldFormHelpers end </code></pre> <p>This gives me:</p> <pre><code>Helpers.instance_methods =&gt; ["bar", "foo"] Helpers.ancestors =&gt; [Helpers, OldFormHelpers] </code></pre> <p>This is code that I don't really have access to modify, without forking.</p> <p>What I want to do is create a new module;</p> <pre><code>module BetterFormHelpers def foo puts "better foo" end end </code></pre> <p>This needs to remove the behaviours from <code>OldFormHelpers</code>, and then add in the new stuff from <code>BetterFormHelpers</code></p> <p>The previous solution was to use <code>undef_method</code> like so:</p> <pre><code>Helpers.module_eval do OldFormHelpers.instance_methods do |m| undef_method(m) end end </code></pre> <p>However, after including <code>BetterFormHelpers</code>, Helpers.instance_methods doesn't contain "foo". The reason for this is explained at <a href="http://ruby-doc.org/core/classes/Module.src/M001652.html" rel="nofollow noreferrer">http://ruby-doc.org/core/classes/Module.src/M001652.html</a></p> <p>Using <code>remove_method</code> tells me that <code>Helpers</code> doesn't have the "foo" method, so I guess I need some way of removing the first inclusion from the ancestors chain...</p> <p>This was getting a bit long so I stopped putting so many snippets in towards the end, but I add an irb session showing the behaviour of undef/remove and then an include.</p>
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    1. CO"This is code that I don't really have access to modify": Is monkey-patching not an option?
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      1. POHow can I "replace" a module included via ruby include function
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    2. COMonkey patching is an option, sort of - but the way the module we're replacing works, It defines the modules and then includes them - it's quite tricky to inject code somewhere into this chain to stop the include happening. Although after pursing this line for a while, I'm starting to lean more in that direction.
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