Display Gravatar Image Easily for Ruby on Rails

Either you are using Rails 2,3 or even 4, you can add this gem to your Gemfile and run bundle install:

gem 'gravatar_image_tag'

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To use it, just call (for example):

gravatar_image_tag current_user.email

More informations and documentations are provided on https://github.com/mdeering/gravatar_image_tag