Prince PDF in view object with a doubt ...

# lib/princely_pdf.rb
module PrincelyPdf
  extend ActiveSupport::Concern

  included do
    include ActionController::Rendering
    include Princely::PdfHelper
    include Princely::AssetSupport
  end

  def build_pdf_data(options = {})
    options = {
      :stylesheets => [],
      :layout => false,
      :relative_paths => true,
      :server_flag => true
    }.merge(options)

    prince = Princely::Pdf.new(options.slice(:server_flag))
    # Sets style sheets on PDF renderer
    prince.add_style_sheets(*options[:stylesheets].collect{|style| asset_file_path(style)})

    html_string = render_to_string(options.slice(:template, :layout, :handlers, :formats))

    html_string = localize_html_string(html_string, Rails.public_path) if options[:relative_paths]

    prince.pdf_from_string(html_string)
  end

  def pdf_file(options = {})
    @pdf_file ||= begin
                    options[:pdf_file_data] ||= build_pdf_data(options).force_encoding('utf-8')
                    options[:filename] ||= "report"

                    report_temp_file = Tempfile.new([ options[:filename], '.pdf' ])
                    report_temp_file.write(options[:pdf_file_data])
                    report_temp_file.rewind
                    report_temp_file
                  end
  end

  def render_to_string(options = {})
    raise 'overwrite me'
  end
end

# view object
require 'princely_pdf'

class StudentTranscript
  include PrincelyPdf

  def render_to_string(options = {})
    av = ActionView::Base.new(ActionController::Base.view_paths)
    av.extend TranslationHelper
    av.render(:template => "contacts/transcripts/index.pdf.erb",
              :layout => options[:layout],
              :locals => {
                          :@school => SchoolDecorator.new(school),
                          :@student => StudentProfilePresenter.new(student)
                         })
  end
end