Rails 3 has involved rewriting pretty much the whole codebase,

Rails 3 gives off the fragrance of a coherent, cohesive framework.

But this one kind of annoys me.

/Users/matthew/.bundle/ruby/1.8/bundler/gems/rails-16a5e918a06649ffac24fd5873b875daf66212ad-master/activerecord/lib/active_record/named_scope.rb:104:in `scope’: Cannot define scope :open because AbcDef.open method already exists. (ArgumentError)

So, in Rails 3, when defining a named scope, we can’t override an existing method.

This all makes sense, we don’t want to inadvertently break anything (although I’d hope your test would catch such a thing)

But unfortunately, every object in Ruby has an “open” method… so “open” suddenly is off the market for named scopes… bummer

I spent most of day trying to sort this out… writing a patch… trying to convince people to apply it… but the rails core guys wouldn’t budge.

So here’s a quick hack I put in an initializer

# config/initializers/allow_open_as_a_named_scope.rb
require 'active_record'
class ActiveRecord::Base
  class << self
    alias :_open :open
    undef_method :open
  end
end

And we’re done…

Kind of annoying though. I use “open” all the time, because it makes sense

I’d prefer it if active record just made a logger.warn, and let me make my own decisions

My Fork of rails, My Example of the bug, My Undef_Method hack

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RudyGems

Rails 3 doesn’t allow “open” as a Named Scope