app/views/page_collections/edit.html.erb
<%= render 'form', page_collection: @page_collection %>
<%=
link_to 'Delete this page collection',
@page_collection,
method: :DELETE,
class: 'btn btn-flat red-text right',
data: { confirm: "Are you sure? This will PERMANENTLY delete this entire collection! It cannot be undone!" }
%>