rake routes

content_tag_for

asset_path()

<%= image_tag(url, :class => "class") %>

<% if current_page?(controller: 'news')%>

<% content_for :not_authorized do %>
<script>
  alert('You are not authorized to do that!')
</script>
<% end %>

<%= params[:controller] %>

<% if request.path.start_with?'/links' %>

<%= link_to image_tag('picture'), 'url', :target => '_blank' %>

submit_tag "Complete sale", data: { disable_with: "Please wait..." }