I'm using simple_form 3.1.0.rc2 with Rails 4.1.4. My form is very simple, as you can see down bellow.
<%= simple_form_for(@transmission) do |f| %>
<%= f.error_notification %>
<%= f.input :name, placeholder: 'Event name' %>
<%= f.input :event_url %>
<%= f.input :description, as: :text %>
<%= f.input :event_type, selected: @transmission.event_type || Transmission::EVENT_TYPES.first, collection: Transmission::EVENT_TYPES %>
<%= f.input :event_start, as: :datetime %>
<%= f.input :event_end, as: :datetime %>
<%= f.input :media_id %>
<%= f.input :max_bitrate, as: :radio_buttons checked: @transmission.max_bitrate || 750, collection: Admin::Transmission::BITRATES %>
<%= f.submit 'Save', class: 'btn btn-primary' %>
<%= link_to 'Back', transmissions_path, class: 'btn btn-primary' %>
<% end %>
This form outputs this strange html (I tested using Chrome Version 38.0.2125.101 on MacOs ).
I'm most worried with: datetime and radio_buttons fields, am I missing something? what can I do to fix this?