create a pdf of all samples

gistfile1.txt

SamplesController ---  

  def index
    if current_diver.role == 'admin'
      @samples = Sample.all
    elsif current_diver.role == 'manager'
      @samples = Sample.joins(:diver_samples).where( "diver_samples.diver_id=? AND diver_samples.primary_diver=? OR boatlog_manager_id=?", current_diver, true, current_diver.boatlog_manager_id ).uniq
    else
      @samples = current_diver.samples.merge(DiverSample.primary)
    end

    @proofing_samples = current_diver.samples.merge(DiverSample.primary) 

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @samples }
      format.csv  { send_data Sample.to_csv }
      format.xls
      format.pdf do 

        pdf = SamplePdf.new(@proofing_samples)
        send_data pdf.render, filename: "#{current_diver.whole_name}.pdf",
                              type: "application/pdf",
                              disposition: "inline"
      
      end
    end
  end


class SamplePdf < Prawn::Document
  
  def initialize(samples)
      super(margin: 2)
    samples.each do |sample|
      @sample = sample
      sample_head
      substrate_slope
      max_vert_relief
      surface_relief_perc
      blank1
      abiotic_footprint
      blank2
      comments
      biotic_cover
      species_data_27
      if @sample.sample_animals.length > 27
        species_data_54
      end
      start_new_page
    end
  end