Add rake for encrypting columns in the DB

lib/tasks/encyrpt_all_data.rake

@@ -0,0 +1,31 @@
+namespace :db do
+  task :encrypt_all_columns do
+    require 'travis'
+    Travis::Database.connect
+
+    to_encrypt = {
+      Request => [:token],
+      SslKey  => [:private_key],
+      Token   => [:token],
+      User    => [:github_oauth_token]
+    }
+
+    encrypted_column = Travis::Model::EncryptedColumn.new
+    to_encrypt.each do |model, column_names|
+      model.find_in_batches do |records|
+        ActiveRecord::Base.transaction do
+          records.each do |record|
+            column_names.each do |column|
+              puts "Encrypting #{model}##{column} (id: #{record.id})"
+
+              data = record.send(column)
+              if encrypted_column.encrypt?(data)
+                record.update_column(column, encrypted_column.encrypt(data))
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end