Fix before_type_cast for non-dirty attributes (issue #52).

Only use before_type_cast implementation if earlier than 3.1.0 which has
it's own working version for date/time fields now.

spec/spec_helper.rb

@@ -71,9 +71,10 @@ ActiveRecord::Schema.define(:version => 1) do
 end
 
 class Employee < ActiveRecord::Base
-  define_attribute_methods
-
   attr_accessor :redefined_birth_date_called
+  validates_date :birth_date, :allow_nil => true
+  validates_date :birth_time, :allow_nil => true
+  validates_date :birth_datetime, :allow_nil => true
 
   def birth_date=(value)
     self.redefined_birth_date_called = true
@@ -90,8 +91,5 @@ RSpec.configure do |c|
     Person.reset_callbacks(:validate)
     PersonWithShim.timeliness_validated_attributes = []
     Person._validators.clear
-    Employee.reset_callbacks(:validate)
-    Employee.timeliness_validated_attributes = []
-    Employee._validators.clear
   end
 end

spec/validates_timeliness/orm/active_record_spec.rb

@@ -82,6 +82,7 @@ describe ValidatesTimeliness, 'ActiveRecord' do
       r = Employee.create!
       r.birth_date = '2010-01-01'
       r.reload
+
       r._timeliness_raw_value_for(:birth_date).should be_nil
     end
   end
@@ -94,7 +95,16 @@ describe ValidatesTimeliness, 'ActiveRecord' do
     it 'should return original value' do
       r = Employee.new
       r.birth_datetime = date_string = '2010-01-01'
+
       r.birth_datetime_before_type_cast.should == date_string
     end
+
+    it 'should return attribute if no attribute assignment has been made' do
+      datetime = Time.zone.local(2010,01,01)
+      Employee.create(:birth_datetime => datetime)
+
+      r = Employee.last
+      r.birth_datetime_before_type_cast.should match(/2010-01-01 00:00:00/)
+    end
   end
 end