Ruby on Rails

I have created some radio boxes as follows:

<% f.radio_button :usertype, "false" %>False
<% f.radio_button :usertype, "true" %>True

where usertpe is a boolean in the db

I want to be able to create a default selection and I want to validate
the options and ensure that for whatever reason there is always a check
in one of the boxes...now I know a proper radio box config will always
have one option selected. How do I validate? For example
validates_prescence_of: usertype?
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