app/views/server/tags/_form.html.erb
<%= simple_form_for tag, url: tag.new_record? ? server_tags_path : server_tag_path(tag) do |f| %>
<%= f.input :name %>
<%= f.association :websites,
as: :check_boxes,
collection: Communication::Website.ordered,
label_method: -> (website) { "#{website} — #{website.university}" } %>
<% content_for :action_bar_right do %>
<%= submit f %>
<% end %>
<% end %>