I made my own solution in a generate_appcahe_manifest.rake file and put it in /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
So when I run rake generate_appcache_file on the terminal, I got a /public/manifest.appcache file with the compiled assets 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 that file on my /app/views/layouts/app.html.erb file:
<!DOCTYPE html>
<html lang="en" manifest="/manifest.appcache">
More info about offline application cache that helps me a lot can be found here.
