tags: Ruby, Tips and Tricks date: 2010-06-08 23:20:33.000000000Z
##What is Gravatar?
Your Gravatar is an image that follows you from site to site appearing beside your name when you do things like commenting or posting on a blog. Avatars help to identify your posts on blogs and web forums, so why not on any site?
##Understanding how to get images from Gravatar
When you sign up in gravatar, you need to register an unique e-mail, right? Gravatar uses that email address to generate an unique MD5.hexdigest key, and then, it links that key to your image file.
Let’s take a look at my gravatar image url:
See? that “id” parameter is the MD5.hexdigest key generated with your email, let’s try generate that in our application and check if it’s the same:
** Result => fc929d292323e019d5c4a353f92d5587
Yeah it’s the same code, so if you prefer, you can write your own tool to get the gravatar user image: just use that key that was generated and make a string with the entire URL.
##Installing and using gravtastic
Install it like a gem:
gem install gravtastic
Add to your environment.rb file:
config.gem 'gravtastic', :version => '>= 2.1.0'
In your model specify that:
class User < ActiveRecord::Base is_gravtastic! end
Now in your view you can use that:
<%= image_tag @user.gravatar_url %>
You can also specify some parameters:
is_gravtastic :author_email, :secure => true, :filetype => :gif, :size => 120
The entire documentation here http://github.com/chrislloyd/gravtastic That’s all, now you can easily get avatars from Gravatar.
Ps: if you try to get your avatar on your own without gravtastic, remember to require “digest/md5” in your project.