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<script type="text/javascript" >
jQuery.ajaxSetup({
  'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}
});

jQuery.fn.submitWithAjax = function() {
  this.submit(function() {
    $.post(this.action + '.js', $(this).serialize(), null, "script");
    return false;
  })

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    def create_po
      provides :js
      po = params[:purchase_order]
      # do the creating job for the po
      render
    end

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<% if @purchase_order %>
  $("div.remote_<%= @counter %>").text("done");
<% else %>
  <% if @params['vendor_name'] == "Enter the vendor's name" || @params['purchase_order'].nil? %>
    $("#vendor_name").focus();
    $("#error_<%=@counter%>").after('<span class="error">Vendor is required.</span>');
  <% end %>

  <% @params['cb3_ids'].each do |cb3_id| %>
    <% %w{quantity unitsize price bt tcost}.each do |word| %>

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Merb::BootLoader.after_app_loads do
  Merb.add_mime_type(:pdf, :to_pdf, %w[application/pdf], "Content-Encoding" => "gzip")
end

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<%= form_for(@price_letter, :action => resource(:ordering, @price_letter, :priceletter, :format => "pdf"), :class => "form") do %>

  # fields for ....

<% end =%>

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def priceletter
  provides :pdf

...
end

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pdf = Prawn::Document.new(
  :page_size => "A4", 
  :left_margin => 2.cm,
  :right_margin => 2.cm,
  :top_margin => 2.cm,
  :bottom_margin => 1.5.cm 
)
  # logo
logo = image_dir + 'logo.jpg'
pdf.image logo, :position => :center

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# price_letter.pdf.erb
<%=
  require "prawn/measurement_extensions"
  require "prawn/table"

  pdf = Prawn::Document.new(
    :page_size => "A4", 
    :left_margin => 2.cm,
    :right_margin => 2.cm,
    :top_margin => 2.cm,

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#I am not sure if this is the feature(it is designed to do so), 
# or I'm doing it wrong. Here is the situation I have:
# as of DM version: 0.9.9

class Order
   before :destroy, :destroy_items
   ....
   has n, items ...
  
   def destroy_items

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# from dm-constraints/lib/dm-constraints/delete_constraint.rb
 when :destroy!
   if children
     # not sure why but this lazy_load is necessary
     # otherwise children will not be deleted with destroy!
     children.lazy_load
     children.destroy!
   end
....