fix generated_methods bug where read instead of write method stored

existing spec failed unless run alone as attribute methods already
primed. fixed spec to undef method and empty generated_methods set

lib/validates_timeliness/active_record/attribute_methods.rb

@@ -51,10 +51,11 @@ module ValidatesTimeliness
             if [:date, :time, :datetime].include?(column.type)
               time_zone_aware = create_time_zone_conversion_attribute?(name, column) rescue false
 
-              define_method("#{name}=") do |value|
+              method_name = "#{name}="
+              define_method(method_name) do |value|
                 write_date_time_attribute(name, value, column.type, time_zone_aware)
               end
-              timeliness_methods << name
+              timeliness_methods << method_name
             end
           end
 

spec/active_record/attribute_methods_spec.rb

@@ -5,7 +5,9 @@ describe ValidatesTimeliness::ActiveRecord::AttributeMethods do
     @person = Person.new
   end
 
-  it "should call write_date_time_attribute when date attribute assigned value" do
+  it "should define and call write method on first assign" do
+    Person.class_eval { @generated_methods = Set.new }
+    Person.send(:undef_method, :birth_date=)
     @person.should_receive(:write_date_time_attribute)
     @person.birth_date = "2000-01-01"
   end