Revisions#diff
<%= link_to 'Revisions', node_revisions_path(@node) %>
<%= form_tag diff_node_revisions_path do %>
<%= select_tag :start_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:start_revision].to_i) %>
<%= select_tag :end_revision, options_for_select(@node.pages.map{|x| x.revision}, params[:end_revision].to_i) %>
<%= select_tag :view, options_for_select([['Inline', 'inline'], ['Side by side', 'side_by_side']], @diff_view) %>
<%= submit_tag 'Diff' %>
<% end %>
<% if @diff_view == :side_by_side %>
Title
<%= raw @diff[:title][0] %>
Abstract
<%= raw @diff[:abstract][0] %>
Body
<%= raw @diff[:body][0] %>
Title
<%= raw @diff[:title][1] %>
Abstract
<%= raw @diff[:abstract][1] %>
Body
<%= raw @diff[:body][1] %>
<% else %>
Title
<%= raw @diff[:title] %>
Abstract
<%= raw @diff[:abstract] %>
Body
<%= raw @diff[:body] %>
<% end %>