How to use radio button correctly in rails?

see label(object_name, method, content_or_options = nil, options = nil, &block)

  <div class="field">
    <%= f.label :autolyse %><br />
    <%= f.label :autolyse, "Yes", :value => "true"  %>
    <%= f.radio_button :autolyse, true %>
    <%= f.label :autolyse, "No", :value => "false" %>
    <%= f.radio_button :autolyse, false, :checked => true %>
  </div>

If you want to keep selected the option chosen by the user, you should validate the param, would be something like this:

<div class="field">
  <%= f.label :autolyse %><br />
  <%= f.label :autolyse, "Yes", :value => "true"  %>
  <%= f.radio_button :autolyse, true, !!params[:autolyse] %>
  <%= f.label :autolyse, "No", :value => "false" %>
  <%= f.radio_button :autolyse, false, !!params[:autolyse] %>
</div>

If you want to do it from the object properties you just replace the params variable for the object property:

<div class="field">
  <%= f.label :autolyse %><br />
  <%= f.label :autolyse, "Yes", :value => "true"  %>
  <%= f.radio_button :autolyse, true, [email protected] %>
  <%= f.label :autolyse, "No", :value => "false" %>
  <%= f.radio_button :autolyse, false, [email protected] %>
</div>