Ruby on Rails

hi
i know data type changes to the corresponding ruby one when reading
data from database,but wonder how it changes when writing data to
database.
for example,if there is a new answer (
answer=Answer.new(params[:answer]) ),it will be validated,and saved to
database,but how does the attribute value's datatype change during this
process?it is always string type until be saved to database?

i use rails3 active_model's new feature,really want to know the above?
can you help me?

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