gistfile1.txt

# application.html.erb
<%=raw yield_section(1, :description) %>

# application_helper.rb
def yield_section(number, content_name)
  content = find_dynamic_content(number)
  return content if content
  yield content_name # throws a no block given (yield) error, it's supposed to yield to the view
end

# show.html.erb 
<% content_for :description %>
 DEFAULT CONTENT HERE 
<% end %>


# i could do it like this

<% if yield_section(1) %>
  <div><%= yield_section(1)  %></div>
<% else %>
  <div>yield :description</div>
<% end %>