people_controller.rb

# GET /people/1
  # GET /people/1.xml
  def show
    @person = Person.find(params[:id])
    @kases= @person.kases(:all)

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @person }
      format.mobile
    end
  end

show.html.erb

<% if @kases.blank?  %>
      No Kase found.
<% else %>
   <% for kase in @kases %>
      <%=h kase.jobref %>
   <% end %>
<% end %>