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How to create rails 4 offline webapp?

I am trying to create an application with Rails 4 that should be used without an internet connection. I heard about the html5 app chum and the rack in the rack that I used. Now it seems that it does not work properly on Rails 4, since /application.manifest only shows:

 CACHE MANIFEST # dd1ba6bba9339ef83f9c1225c70289dd6326d3caae01b0d52b502381030dc78f 404.html 422.html 500.html NETWORK: *

In addition, I use precompile assets, so application.js, application.css and image files have fingerprints in their names, something like application-e8cc2fba8275c884c.js.

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I made my own decision in the generate_appcahe_manifest.rake file and put it in the /lib/tasks folder.

 task :generate_appcache_file => ['deploy:precompile_assets', 'html5_manifest'] desc "Create html5 manifest.appcache" task :html5_manifest => :environment do puts 'Creating appcache manifest file...' File.open("public/manifest.appcache", "w") do |f| f.write("CACHE MANIFEST\n") f.write("# Version #{Time.now.to_i}\n\n") f.write("CACHE:\n") assets = Dir.glob(File.join(Rails.root, 'public/assets/**/*')) assets.each do |asset| if File.extname(asset) != '.gz' && File.extname(asset) != '' && File.extname(asset) != '.json' filename_path = /#{Rails.root.to_s}\/public\/(assets\/.*)/.match(File.absolute_path(asset))[1].to_s # f.write("assets/#{File.basename(asset)}\n") f.write(filename_path.concat("\n")) end end f.write("\nNETWORK:\n") f.write("*\n") f.write("http://*\n") f.write("https://*\n") end puts 'Done.' end namespace :deploy do task :precompile_assets do require 'fileutils' if File.directory?("#{Rails.root.to_s}/public/assets") FileUtils.rm_r "#{Rails.root.to_s}/public/assets" end puts 'Precompiling assets...' puts `RAILS_ENV=production bundle exec rake assets:precompile` puts 'Done.' end end

Therefore, when I run rake generate_appcache_file on the terminal, I got the /public/manifest.appcache file with assets compiled like this:

 CACHE MANIFEST # Version 1409045103 CACHE: assets/app/backgrounds/strips-05561384267a3286ab382c852f1e8b0d.jpg assets/app/backgrounds/team-12e0fc5f670794c4eba3db117fba6746.jpg assets/app-a7de6b02d1d39b783fe4e7ab7906ec95.css assets/app-ae958853aa13f9011e35121cbe5b3cfe.js NETWORK: * http://* https://*

Finally, I call this file in the /app/views/layouts/app.html.erb file:

 <!DOCTYPE html> <html lang="en" manifest="/manifest.appcache">

More information about the standalone application cache, which helps me a lot, can be found here .

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Source: https://habr.com/ru/post/1201110/

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