[Rails] Column with dynamic db type

Hi,

I have a Question model where the answer to the question can have
multiple db type (integer, string, boolean, ...).

I would like to know if you have a better solution than this one:

Question:
question:string
answer_type:string

AnsweredQuestion:
question_id:integer
answer:text
answer_type:string

Ex: AnsweredQuestion.create(:question => 1, :answer => '5', :answer_type
=> 'Integer')

My problem with this solution is that I can't question is that I can't
question the answered questions where the answer is > 2.

Any better idea?

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