app/models/user.rb

@@ -9,7 +9,7 @@ class User < ActiveRecord::Base
 
   has_secure_password
 
-  before_validation :strip_whitespaces, :set_uuid, :set_name, :set_email_token, :set_role
+  before_validation :strip_whitespaces, :set_uuid, :set_name, :set_email_token, :set_role, :set_badge
 
   validates_presence_of :password, :password_confirmation, :email_token, on: :create
   validates_presence_of :name, :email, :ign

db/migrate/20170319193517_add_badge_id_to_users.rb

@@ -7,6 +7,7 @@ class AddBadgeIdToUsers < ActiveRecord::Migration
       t.string  "color"
     end
 
+    Badge.create!({name: "none", symbol: "", color: "#000"})
     dbadge = Badge.create!({name: "donor", symbol: "$", color: "#f60"})
 
     add_column :users, :badge_id, :integer, default: 0