app/views/announcements/_form.html.erb
<%= simple_form_for(@announcement) do |f| %>
<%= f.error_notification %>
<div class="form-inputs">
<%= f.input :title %>
<%= f.input :content %>
<%#= f.input :attachments_count %>
<%#= f.input :limit_to_users %>
<%= f.input :start_delivering_at,as: :bootstrap_datepicker %>
<%= f.input :stop_delivering_at,as: :bootstrap_datepicker %>
<%= f.simple_fields_for :announcement_attachments do |i| %>
<%= i.input :attachment, as: :file %>
<% end %>
<%#= render :partial => 'attachment_fields', :locals => { :f => f } %>
</div>
<div class="form-actions">
<%= f.button :submit %>
</div>
<% end %>