ruby on rails 3 - How to update an attribute ':what_cause' of model user using group of radio button in rails3 -

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i want update attribute ':what_cause' of model user on page in session. user clicks on 1 of 3 radio buttons , corresponding value should transferred method updates it. wrote following code-

<%= form_for :user |f| %>     <label>pratham</label>     <%= f.radio_button :what_cause, "pratham" %>     <label>kali</label>     <%= f.radio_button :what_cause, "kali" %> <label>akshaya</label>     <%= f.radio_button :what_cause, "akshaya" %>     <%= f.submit "save", :controller => "users_controller", :action => "change_cause", :method => "put" %> <% end %>

and here code updation in change_cause method of users_controller.rb-

def change_cause if params[:radio_button] == "pratham" @user.update_attribute(:what_cause, "pratham") end if params[:radio_button] == "kali"     @user.update_attribute(:what_cause, "kali") end if params[:radio_button] == "akshaya"     @user.update_attribute(:what_cause, "akshaya") end end

but not working. please enlighten me. newbie in rails!!!

def change_cause   @user.update_attribute(:what_cause, params[:user][:what_cause]) end

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