app/views/calendars/warn.html.erb
<% title "Conflicts!" %>
<strong><p>If you activate this calendar, the following events will be wiped away:</p></strong>
<ul>
<% @problems.each do |problem| %>
<li><%= problem %></li>
<%end%>
</ul>
<p>Would you like to activate the calendar anyway?<p>
<%= button_to "No! Take me back!", calendars_path, method: :get %>
<%= button_to "Activate anyway." , toggle_calendar_path(id: @calendar.id, wipe: "true"), confirm: "This will delete all shifts listed on this page. Are you sure?" %>