使用wkhtmltopdf在Rails上的PDF报告中的图像

Question

I want a PDF report with image in record.

the html report works fine with below code:

<% if @student.photo.file? %>
        <%= image_tag @student.photo.url %>
  <% end %>

but when I try pdf report with following code it doesnt work. pls help.

<% if @student.photo.file? %>
        <%= wicked_pdf_image_tag @student.photo.url %>
   <% end %>

and this is my def in controller

def generate_id_card
    @student = Student.find(params[:id])
    render :pdf=>'generate_id_card',
    :show_as_html => true

which wkhtmltopdf shows nothing but I have it installed in /opt directory at: /opt/wkhtmltopdf-amd64

and the WickedPdf.config is

WickedPdf.config = {
#    :wkhtmltopdf => '/opt/wkhtmltopdf',
    :wkhtmltopdf => '/opt/wkhtmltopdf-amd64',
    :layout => "pdf.html",
    :margin => {    :top=> 40,
                    :bottom => 20,
                    :left=> 30,
                    :right => 30},
    :header => {:html => { :template=> 'layouts/pdf_header.html'}},
    :footer => {:html => { :template=> 'layouts/pdf_footer.html'}}

---

which wkhtmltopdf show nothing but I have it installed in /opt /opt/wkhtmltopdf-amd64

and the WickedPdf.config is

WickedPdf.config = {
#    :wkhtmltopdf => '/opt/wkhtmltopdf',
    :wkhtmltopdf => '/opt/wkhtmltopdf-amd64',
    :layout => "pdf.html",
    :margin => {    :top=> 40,
                    :bottom => 20,
                    :left=> 30,
                    :right => 30},
    :header => {:html => { :template=> 'layouts/pdf_header.html'}},
    :footer => {:html => { :template=> 'layouts/pdf_footer.html'}}

Answer 1

rendered_id_card = render_to_string(:template => "students/generate_id_card.pdf.erb", :show_as_html => true )
pdf = WickedPdf.new.pdf_from_string rendered_id_card

try this