Radio Options

<%= text_field_tag 'question[multi_choice][]', option, { disabled: (disable ||= false), data: { last: option } } %>
Other:

<% unless (disable ||= false) %>

Add option

<%= text_field_tag 'question[multi_choice][]', nil, { disabled: (disable ||= false), data: { last: nil } } %>

<% end %>