Write to ruby-on-Rails 3.2

Question

Following the tutorial of railscast to add an image of the site Ravatar I found a lagged information with the updates of Rails. The code to create a default image in case of absence of registration on the Ravatar site does not work as in the code below suggests. I tried to exchange "images" for "Assets", does anyone have any idea that can solve the problem? follow the code:

module ApplicationHelper
  def avatar_url(user)
    default_url = "#{root_url}assets/default.jpg"
    gravatar_id = Digest::MD5::hexdigest(user.email).downcase
    "http://gravatar.com/avatar/#{gravatar_id}.png?s=48&d=#{CGI.escape(default_url)}"
  end
end

Follow the View code that calls the image:

<%= image_tag avatar_url(f) %>

Follow the link of the broken image that looks like it:

http://i2.wp.com/localhost/assets/default.jpg

Answer 1

Gravatar is very simple, put the line below in your helper, 'app/helpers/application_helper.Rb':

  def avatar_url(user)
    if user.url_image.present?
      user.url_image
    else
      gravatar_id = Digest::MD5.hexdigest(user.email.downcase)
      "http://gravatar.com/avatar/#{gravatar_id}.png?s=48"
    end
  end

And under 'app/views/home/index.html', call the helper by passing the current user as parameter:

Logado como <%= avatar_url(current_user) %> <%= current_user.email %>. Não é você?

The method code is very simple, first it checks if there is any image url in the field 'url_image' that you placed earlier, otherwise it will use the user’s email as an id to fetch the image that is stored in Gravatar, the parameter’s=48' at the end is to set the size to resize the image.

Source: http://vagnerzampieri.blogspot.com.br/2011/03/ruby-on-rails-do-zero-devise.html