imgkit gem not working on heroku in rails application - ruby-on-rails

Question

Hi I have a little application that is using imgkit to generate a png from some text. Every quote in my quote model uses imgkit to create a png version
app/controllers/quotes_controller.rb
def show
respond_to do |format|
format .html
format.png do
kit = IMGKit.new render_to_string, width: 1080, height: 1080
send_data kit.to_png, type: "image/png", disposition: "inline"
end
end
end
It works well on my local machine but when i upload to heroku imgkit stops working.
I tried adding the binaries to the gem file as below:
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }
ruby '2.6.0'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.3'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby
gem 'bootstrap'
gem 'jquery-rails'
gem 'imgkit'
gem 'wkhtmltoimage-binary'
gem 'devise'
gem "font-awesome-rails"
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
gem "better_errors"
gem "binding_of_caller"
end
group :development do
# Access an interactive console on exception pages or by calling 'console' anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
group :test do
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '>= 2.15'
gem 'selenium-webdriver'
# Easy installation and use of chromedriver to run system tests with Chrome
gem 'chromedriver-helper'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
Unfortunately this didn't work.
I then followed the instructions at https://github.com/csquared/IMGKit#heroku
and downloaded the 10.0 version mentioned from https://github.com/wkhtmltopdf/obsolete-downloads/blob/master/README.md#linux
I added the file to bin/wkhtmltoimage-amd64 and I added the file config/initializers/imgkit.rb
with the following code to that file
IMGKit.configure do |config|
config.wkhtmltoimage = Rails.root.join('bin', 'wkhtmltoimage-amd64').to_s if ENV['RACK_ENV'] == 'production'
end
I tested and found it didnt work and I keep getting the
IMGKit::NoExecutableError (No wkhtmltoimage executable found at /app/bin/wkhtmltoimage-amd64
can anyone point me in the right direction, please let me know if you need any more info

Answer 1

You have added the binary at app/bin/wkhtmltoimage-amd64, but you're specifying Rails.root.join('bin', 'wkhtmltoimage-amd64'), which is bin/wkhtmltoimage-amd64.
Either
move the binary to bin/wkhtmltoimage-amd64, or
change Rails.root.join('bin', 'wkhtmltoimage-amd64') to Rails.root.join('app', 'bin', 'wkhtmltoimage-amd64').
I'd recommend the first option as it is more typical to have binaries at the root in bin/.