From: Thijs De vries <lists@...>
Date: 2013-01-22T04:48:00+09:00
Subject: Weird send behavior in 1.9

Hey Guys,
I used to have the following code:

<%= form_for @something do |f| %>
<%= f.send :select, :state, [['AL', 'Alabama'], ['AK', 'Alaska'] #etc %>
<% end %>

When I run this I get an exception because the kernel module method
select gets called expecting an array for the first arg but gets the
symbol :state instead. This is strange because f (an instance of
ActionView::Helpers::FormBuilder) has this method defined publicly.

Looking at the rails code, it does not seem that anything fancy is being
done metaprogramming wise except for re-opening the class to define the
select method on the ActionView:: Helpers::FormBuilder class. This is a
public method and even if it was private, you would think that ruby
would look from the closest class first (being the FormBuilder class)
before looking up to the kernel module.

Does anyone have any good documentation on the rules for ruby send on
how it determines which method gets called?

The above issue can be reproduced with rails 3.2.10 and ruby 1.9.3 patch
level 327.
Thijs

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