radio button won't checked=checked

gistfile1.txt

the problem was solved by nesting the 

<input name="option.<%= feature.name %>" type="radio" checked="checked" value="<%= option_value %>">

in a form.
<form>
<input name="option.<%= feature.name %>" type="radio" checked="checked" value="<%= option_value %>">
</form>

 Altho in one controller it works NOT in a form and also the checkboxes were checked=checked without the form.

For some reason making it a form allowed for the checked=checked to work.

The other features of the radio buttons worked fine, just not checked=checked.