start encoding candidate emails - completes #57

db/migrate/20160826200610_encode_candidate_emails.rb

@@ -0,0 +1,26 @@
+class EncodeCandidateEmails < ActiveRecord::Migration[5.0]
+  def change
+    sql = "select id, email from candidates;"
+    candidates = ActiveRecord::Base.connection.execute(sql).to_h
+
+    candidates.each do |id, email|
+      sql = if base64?(email)
+              # going down - decrypt
+              "UPDATE candidates set email = '#{CryptSerializer.load email}' WHERE id = #{id};"
+            else
+              # going up - encrypt emails
+              "UPDATE candidates set email = '#{CryptSerializer.dump email}' WHERE id = #{id};"
+            end
+      ActiveRecord::Base.connection.execute(sql)
+    end
+  end
+
+  private
+
+    def base64? string
+      Base64.urlsafe_decode64 string
+      true
+    rescue ArgumentError
+      false
+    end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160824183159) do
+ActiveRecord::Schema.define(version: 20160826200610) do
 
   create_table "answers", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
     t.integer  "candidate_id"