PDF

Export html page to PDF (Rails 6, Heroku)

----- Model: Recipe -----

1) 
Gemfile 
==========
gem 'grover' (https://github.com/Studiosity/grover)

Terminal
============
yarn add puppeteer

2) routes
==========
resources :recipes do
  member do
    get "to_pdf", to: "recipes#to_pdf"
  end
end

3) RecipesController
====================
def to_pdf
  if params[:format] == 'pdf' # Избыточно (redundantly)
    url = request.url.remove("/to_pdf.pdf")
    pdf = Grover.new(url, format: 'A3', emulate_media: 'screen', landscape: true ).to_pdf

    Tempfile.create do |tmp|
     tmp.binmode
     tmp.write(pdf)
     tmp.rewind
     tmp.close
     send_data(
       File.open(tmp.path, 'rb').read,
       type: 'application/pdf',
       filename: "test.pdf",
       disposition: 'inline'
      )
    end
  end
end

4) recires#show
===============
<%= link_to "Export as PDF", to_pdf_recipe_path(@recipe, format: :pdf), target: '_blank', title: 'Click to Export as PDF', class: 'ms-2' %>

or

<%= link_to to_pdf_recipe_path(@recipe, format: :pdf), target: '_blank', title: 'Click to Export as PDF', class: 'ms-2' do %>
  <%= image_tag("pdf.png", size: "32x32", alt: "Export as PDF", class: 'export-pdf') %>
<% end %>

2Run on Heroku!
=============
heroku buildpacks:add heroku/nodejs --index=1
heroku buildpacks:add jontewks/puppeteer --index=2
heroku config:set GROVER_NO_SANDBOX=true


PS work in console:

url = 'http://localhost:3000/recipes/ultimate-falafel-wrap?lang=ru'
pdf = Grover.new(url, format: 'A4', emulate_media: 'screen', landscape: true ).to_pdf
File.open(Rails.root.join('tmp/github-fronpage.pdf'), 'wb') { |f| f.write(pdf)}
------ Open file in folder tmp --------

interesting