Frederick Cheung wrote in post #1121711:
> On Tuesday, September 17, 2013 8:59:06 PM UTC+1, Ruby-Forum.com User
> wrote:
>>
> aliasing pretty much creates a copy of a method - later attempts to
> redefine the original method don't affect the copy. For example
>
> class Example
>   def foo
>     puts "foo"
>   end
>
>   alias_method :bar, :foo
>
>   def foo
>     puts "new foo"
>   end
> end
>
> Example.new.foo() #=> "new foo"
> Example.new.bar() #=> "foo"
>
> You'll have to do your own alias method chaining when you include your
> module (in newer versions of rails alias_method_chain has falled out of
> favour)
>
> Fred

That's exactly what it was! I had to re-alias the method names.

So the original plugin used alias_method_chain to alias :rewrite, 
:rewrite_with_subdomain

I had to restructure my module like this:

module CustomRouting
    def included(base)
      base.send :alias_method, :rewrite, :rewrite_with_subdomains
    end

    def native_plugin_method
         #successfully invoked
        ...a bunch of code
        super #will call method from SubdomainRoutes::UrlWriter
    end

    def rewrite_with_subdomains
       #method is never invoked
       ...code
       super
    end
end

And now my overloaded method is correctly invoked, and the 'super' call 
works properly and invokes the previous alias.

This was really complicated. phew

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