コンソールからの同じクエリが機能するときスコープ付きクエリが失敗する

Question

クエリを直接使用するとスコープ付きクエリを使用できないのはなぜですか？

マイモデル：

class Score < ActiveRecord::Base 
    belongs_to :query 
    belongs_to :pull#, :counter_cache => true 

    scope :latest, find_by_sql("SELECT * FROM (SELECT * FROM scores ORDER BY created_at DESC) s GROUP BY query_id") 
end 

コンソール

localhost:~/code/myproject[master]% rails c 

Loading development environment (Rails 3.0.1) 
>> Score.latest 
NoMethodError: undefined method `includes_values' for #<Array:0x7f28f2cb0e18> 
     from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/relation/spawn_methods.rb:10:in `send' 
     from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/relation/spawn_methods.rb:10:in `merge' 
     from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/relation/spawn_methods.rb:9:in `each' 
     from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/relation/spawn_methods.rb:9:in `merge' 
     from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.1/lib/active_record/named_scope.rb:112:in `latest' 
     from (irb):1 

を焼成が、同じクエリが直接滞りなく動作することを使用。

>> Score.find_by_sql("SELECT * FROM (SELECT * FROM scores ORDER BY created_at DESC) s GROUP BY query_id") 
=> [#<Score id: 1, query_id: 1, pull_id: 11, score: 3209891, created_at: "2010-11-18 04:19:43", updated_at: "2010-11-18 04:19:43">, #<Score id: 2, query_id: 2, pull_id: 11, score: 2890870, created_at: "2010-11-18 04:19:43", updated_at: "2010-11-18 04:19:43">, #<Score id: 3, query_id: 3, pull_id: 11, score: 1361203, created_at: "2010-11-18 04:19:43", updated_at: "2010-11-18 04:19:43">, #<Score id: 7, query_id: 4, pull_id: 13, score: 1382122, created_at: "2010-11-18 04:36:15", updated_at: "2010-11-18 04:36:15">] 
>> 

Answer 1

このバグレポートをチェックアウト：

https://rails.lighthouseapp.com/projects/8994/tickets/5960