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@@ -664,7 +664,7 @@ module ActiveRecord
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             condition_params = [value]
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           else
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             condition_sql = "LOWER(#{sql_attribute}) #{comparison_operator}"
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-            condition_params = [value.downcase]
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+            condition_params = [value.chars.downcase]
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           end
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           if scope = configuration[:scope]

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@@ -451,6 +451,18 @@ class ValidationsTest < ActiveRecord::TestCase
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     t2.title = nil
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     assert t2.valid?, "should validate with nil"
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     assert t2.save, "should save with nil"
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+
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+    with_kcode('UTF8') do
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+      t_utf8 = Topic.new("title" => "Я тоже уникальный!")
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+      assert t_utf8.save, "Should save t_utf8 as unique"
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+
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+      # If database hasn't UTF-8 character set, this test fails
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+      if Topic.find(t_utf8, :select => 'LOWER(title) AS title').title == "я тоже уникальный!"
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+        t2_utf8 = Topic.new("title" => "я тоже УНИКАЛЬНЫЙ!")
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+        assert !t2_utf8.valid?, "Shouldn't be valid"
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+        assert !t2_utf8.save, "Shouldn't save t2_utf8 as unique"
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+      end
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+    end
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   end
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   def test_validate_case_sensitive_uniqueness