How to set up rack-offline in rails 3.2 app

Question

How to make rake-offline work in rails 3.2.11 ?

I added initializer

offline = Rack::Offline.configure do
  #cache "images/masthead.png"

  public_path = Rails.public_path
  Dir[public_path.join("javascripts/*.js")].each do |file|
    cache file.relative_path_from(public_path)
  end

  network "/"
end

I added in routes

match "/application.manifest" => Rails::Offline

  Rack::Offline.configure do
    cache "assets/application.js"
    cache "assets/application.css"   
    network "/"
  end

and added manifest in html tag.

It throws error

/initializers/offline.rb:5:in `block in <top (required)>': undefined method `join' for "/Sites/Ruby/project/public":String (NoMethodError)

Answer 1

In Rails 3.2.11, Rails.public_path returns a String , not a Pathname object. (It looks like Rails master has it returning a Pathname object which is why rack-offline's documentation might say to use it that way).

Try this instead:

  public_path = Pathname.new(Rails.public_path)

See https://github.com/wycats/rack-offline/issues/7