Make case insensitive validates_uniqueness_of use unicode aware downc…

…ase method. [#932 state:resolved]

Signed-off-by: Michael Koziarski <michael@koziarski.com>

Conflicts:

	activerecord/lib/active_record/validations.rb

Signed-off-by: Tarmo Tänav <tarmo@itech.ee>

activerecord/lib/active_record/validations.rb

@@ -631,7 +631,7 @@ def validates_uniqueness_of(*attr_names)
             # sqlite has case sensitive SELECT query, while MySQL/Postgresql don't.
             # Hence, this is needed only for sqlite.
             condition_sql = "LOWER(#{record.class.quoted_table_name}.#{attr_name}) #{attribute_condition(value)}"
-            condition_params = [value.downcase]
+            condition_params = [value.chars.downcase]
           end
 
           if scope = configuration[:scope]

activerecord/test/cases/validations_test.rb

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