Rails Cache Digest Rake Task

cache_digest.rake

namespace :cache_digests do
  desc 'Resolves digest for file'
  task :digest => :environment do
    abort 'You must provide TEMPLATE for the task to run' unless ENV['TEMPLATE'].present?
    template_name = CacheDigests.template_name
    finder = CacheDigests.finder
    puts "Finder Contents: #{finder.digest_cache.keys}"
    tree = ActionView::Digestor.tree(template_name, finder, false)
    puts "Locating Digest for '#{template_name}'"
    digest = ActionView::Digestor.digest(name: template_name, finder: finder, dependencies: [])
    puts "digest: #{digest}"
    puts "dependency_digest: #{tree.dependency_digest(finder, [])}"
    puts "dependency_map:"
    puts JSON.pretty_generate(tree.get_map(finder, []))
  end

  class CacheDigests
    def self.template_name
      ENV['TEMPLATE'].split('.', 2).first
    end

    def self.finder
      ApplicationController.new.lookup_context
    end
  end
end