Adding header and footers

Here is how I configured a dynamic header and footer

  def config
    PDFKit.configure do |config|
      config.wkhtmltopdf = "/usr/local/bin/wkhtmltopdf"

      config.default_options = {
        encoding:"UTF-8",
        dpi: '300',
        margin_top: '30',
        margin_bottom: '23',
        margin_left: '10',
        margin_right: '10',
        header_spacing: '0',
        header_html: render_header_footer("header"),
        footer_spacing: '2',
        footer_html: render_header_footer("footer"),
        quiet: true,
        :"user-style-sheet" => "#{Rails.root}/app/assets/stylesheets/pdfkit.scss"
      }
    end
  end

  # Render the footer out to a temp file
  # PDFkit will only accept a file or URL, it will not accept raw text the way you expect.
  # ie; passing the erb compiled output directly back to pdfkit results in non-dynamic content being displayed.
  def render_header_footer(type)
    compiled = ERB.new(File.read("#{Rails.root}/app/views/reports/#{type}.html.erb")).result(binding)
    file = Tempfile.new(["#{type}",".html"])
    file.write(compiled)
    file.rewind
    file.path
  end

Make sure you don't have any broken links in your html files otherwise wkhtmltopdf will break tests.