Reflecting on an Association Extension

rubyonrails-talk
1

Hi all.

How can I reflect on a method which had been extended into an association.

If i try model.association.method(:method_name) I get an undefined error yet I can invoke it via model.association.method_name. I've tried several different approaches to get at the method but can't seem to be able to get hold of it.

Thanks Garrett

2

class Post    has_many :comments do      def some_method      end    end end

The basic issues is that post.comments is not an array, it's an instance of a proxy class that will (when needed) load the collection and forward methods. so when you call post.comments.method(:some_method) that's being forwarded on to the array itself.

You can use post.comments.proxy_respond_to?(:foo) to find if the proxy itself response to a method, but the 'method' method has been undef'd on association proxies.

Fred.

3

Thanks Fred

Is there no way then for me to check that two method names actually have the same implementation.

I had been intending the test that

class Post    has_many :comments do      def foo      end      alias_method :bar, :foo    end end

post.comments.method(:foo) == post.comments.method(:bar)