Rails 3.1 absolute URL to an image

Question

I\'m using Rails 3.1. I\'m trying to figure this out, and to my surprise, it is starting to seem that rails does not come with this method at all. Maybe im wrong.

Ca

Answer 1

Example folder structure.

app/
   assets/
      flags/
         32x32/
            en.png
         256x256/
            en.png

If you want to generate absolute flag image path we can add in to our ApplicationHelper two methods:

module ApplicationHelper

  # Generate flag path by locale
  # - locale. Can be "en", "it", etc.
  # - flag_size. Will be used to set folder size. Folder size can be "32x32", "256x256".
  # Return flag image path. Path will absolute
  def generate_flag_path_by_locale(locale, folder_size = "32")
    folder = "#{flag_size}x#{flag_size}"
    domain_absolute_path = generate_domain_absolute_path
    flag_path = ("#{domain_absolute_path}/assets/flags/#{folder}/#{locale}.png")

    return flag_path
  end

  # Generate domain absolute path
  def generate_domain_absolute_path
    request_protocol = request.protocol
    request_host_with_port = request.host_with_port
    domain_absolute_path = request_protocol + request_host_with_port

    return domain_absolute_path
  end
end

Into our apps/view/products.html.erb. We must to call only:

<% flag_path = generate_flag_path_by_locale("en") %> 

Final result:

http://my_domain.com:3000/assets/flags/32x32/en.png