add Authorization class for Ruby example

examples/server/ruby/app/models/authorization.rb

@@ -0,0 +1,50 @@
+# == Schema Information
+#
+# Table name: authorizations
+#
+#  id         :integer          not null, primary key
+#  provider   :string
+#  uid        :string
+#  token      :string
+#  user_id    :integer
+#  created_at :datetime
+#  updated_at :datetime
+#  secret     :string
+#
+# Indexes
+#
+#  index_authorizations_on_user_id  (user_id)
+#
+
+class Authorization < ActiveRecord::Base
+  belongs_to :user
+  validates_presence_of :user_id, :uid, :provider
+  validates_uniqueness_of :uid, scope: :provider
+
+  scope :facebook, lambda { find_by(provider: 'facebook') }
+  # after_create :fetch_details
+
+  def fetch_details
+    self.send("fetch_details_from_#{self.provider.downcase}")
+  end
+
+  def fetch_details_from_facebook
+    graph = Koala::Facebook::API.new(self.token)
+    profile = graph.get_object("me")
+    user = self.user
+    user.update_attributes(first_name: profile['first_name'], last_name: profile['last_name'],
+                            address: profile["location"]["name"])
+
+    user.save
+  end
+
+  def fetch_details_from_linkedin
+  end
+
+  def fetch_details_from_google_oauth2
+  end
+
+  def fetch_details_from_github
+  end
+
+end