Rails 4 wicked pdf Issue - ruby-on-rails

Question

I'm trying to use wicked pdf to render a html page as pdf.
mime_types.rb
Mime::Type.register "application/pdf", :pdf
controller method
def invoice
respond_to do |format|
format.html
format.pdf do
render pdf: "invoice"
end
end
end
wicked_pdf.rb
:exe_path => '/usr/local/bin/wkhtmltopdf'
invoice.pdf.erb
<div id="test_pdf">
test data
</div>
I have added the above codes and added the following gems to my project.
gem 'wicked_pdf'
gem 'wkhtmltopdf-binary'
When I try to render the page, i get Template is missing error. If i rename invoice.pdf.erb to invoice.html.erb i can bypass the error, but i will be getting a html page instead of pdf.
Do I miss something?

Answer 1

As mentioned in the document of wicked_pdf, you can use it like this. Its self explanatory. Don't forget to create "pdfs" directory
# or from your controller, using views & templates and all wicked_pdf options as normal
pdf = render_to_string pdf: "some_file_name", template: "templates/pdf.html.erb", encoding: "UTF-8"
# then save to a file
save_path = Rails.root.join('pdfs','filename.pdf')
File.open(save_path, 'wb') do |file|
file << pdf
end
send_file save_path, :type=>'text/pdf

Answer 2

This code will be more than enough if you just want to render the pdf:
def show
respond_to do |format|
format.html
format.pdf do
render pdf: 'file_name',
template: 'example/pdf_view.pdf.erb',
layout: 'layouts/application.pdf.erb'
end
end
end
If you want to save as pdf:
def save
pdf = WickedPdf.new.pdf_from_string(
render_to_string(
template: 'example/pdf_view.pdf.erb',
layout: 'layouts/application.pdf.erb'))
send_data(pdf,
filename: 'file_name.pdf',
type: 'application/pdf',
disposition: 'attachment')
end