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@@ -1750,7 +1750,7 @@ module ActiveRecord #:nodoc:
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         def attribute_condition(argument)
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           case argument
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             when nil   then "IS ?"
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-            when Array, ActiveRecord::Associations::AssociationCollection then "IN (?)"
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+            when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::NamedScope::Scope then "IN (?)"
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             when Range then "BETWEEN ? AND ?"
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             else            "= ?"
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           end

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@@ -4,6 +4,7 @@ require 'models/topic'
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 require 'models/comment'
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 require 'models/reply'
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 require 'models/author'
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+require 'models/developer'
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 class NamedScopeTest < ActiveRecord::TestCase
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   fixtures :posts, :authors, :topics, :comments, :author_addresses
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@@ -242,4 +243,8 @@ class NamedScopeTest < ActiveRecord::TestCase
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   def test_find_all_should_behave_like_select
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     assert_equal Topic.base.select(&:approved), Topic.base.find_all(&:approved)
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   end
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+
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+  def test_should_use_where_in_query_for_named_scope
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+    assert_equal Developer.find_all_by_name('Jamis'), Developer.find_all_by_id(Developer.jamises)
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+  end
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 end

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@@ -43,6 +43,8 @@ class Developer < ActiveRecord::Base
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   has_many :audit_logs
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+  named_scope :jamises, :conditions => {:name => 'Jamis'}
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+
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   validates_inclusion_of :salary, :in => 50000..200000
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   validates_length_of    :name, :within => 3..20
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