heroku 上 你要 它卻沒有的gem

Automatically generate Heroku .gems file

用個rake 幫你生這個file
namespace :gems do<br /> desc "Generate .gems file for Heroku"<br /> task :heroku_spec => :environment do<br /> require 'open-uri'<br /> installed_gems = []<br /> url = "http://installed-gems.heroku.com/"<br /> open(url).read.scan(/<li>(\w+) [^<]*<\/li>/) do |w| <br /> installed_gems << w.first<br /> end<br /><br /> gems = Rails.configuration.gems<br /> <br /> # output .gems<br /> dot_gems = File.join(RAILS_ROOT, ".gems")<br /> File.open(dot_gems, "w") do |f|<br /> output = []<br /> gems.each do |gem|<br /> next if installed_gems.include?(gem.name)<br /> spec = "#{gem.name} --version '#{gem.version_requirements.to_s}'"<br /> spec << " --source #{gem.source}" if gem.source<br /> output << spec<br /> end<br /> f.write output.join("\n")<br /> puts output.join("\n")<br /> end<br /> end<br />end