10. full text search. (class decorator for model?)

26. orm for nosql? such as this one: http://qslack.com/projects/rhino-a-ruby-hbase-orm/

27. ref_grandchildren can't access some attributes of grandchildren. for example: everblog project: tag.blog_entrys.lang report an error.

30. generate visual charts according to model. It is good for analyzing and demonstrating. Maybe I can take advantage of existing functionalities of some databases. I know mysql workbench is able to generate chart.

31. make many_to_one a synonym for foreign_key

32. add one_to_many ?

33.