dynamic_form_for_hstore_attributes_in_rails.html.erb

<%= simple_form_for @product do |f| %>
  <%= f.simple_fields_for :attributes do |d| %>

    <% f.object.attributes.try(:each) do |key, value| %>
      <%= d.input key, :input_html => {:value => value } %>
    <% end %>

  <% end %>
<% end %>