Rails - Aug 2007 - capturing radio button values for nested object

I have a user object and an account object. User has one account
object. In the signup.rhtml I have a radio button that has three
options for the membership (yearly, monthly and sample). How do I
populate the account model when the user submits the form?
Is the following syntax correct?

<%= radio_button("user[account]", "membership",
"Yearly") %>
Yearly<br>
<%= radio_button("user[account]", "membership",
"Monthly") %>
Monthly<br>
<%= radio_button("user[account]", "membership",
"Sample") %>
Sample<br>

TIA


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