PDFKit for ruby on rails

http://stackoverflow.com/questions/68569/text-watermark-on-website-how-to-do-it

<style type="text/css">
  #watermark {
    color: #d0d0d0;
    font-size: 200pt;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    position: absolute;
    width: 100%;
    height: 100%;
    margin: 0;
    z-index: -1;
    left:-100px;
    top:-200px;
  }
</style>

<div id="watermark">
  <p>This is the test version.</p>
</div>

http://stackoverflow.com/questions/5399458/render-to-string-does-not-find-partials-pdfkit-controller-response

respond_to do |format|
  format.html
  format.pdf {
    html = render_to_string(:layout => false , :action => "constitution.pdf.haml")
    kit = PDFKit.new(html)
    kit.stylesheets << "#{Rails.root}/public/stylesheets/pdf.css"
    send_data(kit.to_pdf, :filename => "#{@organisation_name} Constitution.pdf",
    :type => 'application/pdf', :disposition => 'inline')        
    return
  }
end

http://metaskills.net/2011/03/20/pdfkit-overview-and-advanced-usage/

/* Page Breaks */

.pb_before { page-break-before:always !important; }
.pb_after  { page-break-after:always !important; }
.pbi_avoid { page-break-inside:avoid !important; }

# My with authentication (sending session cookie name and value)

kit = PDFKit.new(model_url(@model), 'margin-left' => '10mm', 'margin-right' => '10mm',
page_size: 'A5', cookie: "#{Rails::Application.config.session_options[:key]}
 #{cookies[Rails::Application.config.session_options[:key]]}")

file = kit.to_file("#{Rails.root}/tmp/invoices/#{@invoice.id}.pdf")

# My way, rendering file 

# config/initializers/mime_types.rb

Mime::Type.register 'application/pdf', :pdf

#Controller

def show
  @invoice = Model.find(params[:id])
  respond_to do |format|

  format.html { render layout: 'invoice' }

  format.pdf  { 
    unless File.exist?("#{Rails.root}/tmp/model/#{@model.id}.pdf")
      file = pdf_kit.to_file("#{Rails.root}/tmp/model/#{@model.id}.pdf")
    end
  send_file "#{Rails.root}/tmp/model/#{@model.id}_pre.pdf", :type => 'application/pdf' 
  }
  format.xml  { render :xml => @invoice }
  end
end

private

def pdf_kit
  html = render_to_string(action: :show, layout: 'invoice')
  kit = PDFKit.new(html, 'margin-left' => '10mm', 'margin-right' => '10mm', page_size: 'A5',)
  kit.stylesheets << "#{Rails.root}/public/stylesheets/model_pdf.css
  kit
end