app/views/mask_lists/_form.html.erb
<%= simple_form_for(@mask_list) do |f| %>
<%= f.error_notification %>
<div class="form-inputs">
<%= f.input :name %>
<%= f.input :description %>
<%= f.input :file,
input_html: { direct_upload: true } %>
<%= f.input :sensitive %>
<%= f.association :projects, as: :check_boxes, include_blank: false,
collection: Project.accessible_by(current_ability) %>
</div>
<div class="form-actions btn-group">
<%= f.button :submit, class: "btn btn-primary" %>
</div>
<% end %>