query value is converted to_s instead of to_yaml

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -30,7 +30,7 @@ def quote(value, column = nil)
             if value.acts_like?(:date) || value.acts_like?(:time)
               "'#{quoted_date(value)}'"
             else
-              "'#{quote_string(value.to_yaml)}'"
+              "'#{quote_string(value.to_s)}'"
             end
         end
       end

activerecord/test/cases/finder_test.rb

@@ -693,6 +693,14 @@ def test_find_all_by_one_attribute
     assert_equal [], Topic.find_all_by_title("The First Topic!!")
   end
 
+  def test_find_all_by_one_attribute_which_is_a_symbol
+    topics = Topic.find_all_by_content("Have a nice day".to_sym)
+    assert_equal 2, topics.size
+    assert topics.include?(topics(:first))
+
+    assert_equal [], Topic.find_all_by_title("The First Topic!!")
+  end
+
   def test_find_all_by_one_attribute_that_is_an_aggregate
     balance = customers(:david).balance
     assert_kind_of Money, balance