fix validation error on encrypted field in embedded document.

lib/mongoid/encryptor.rb

@@ -19,7 +19,7 @@ def encrypts(*attrs)
           mode = options.delete(:mode) || :sha
           cipher_class = EncryptedStrings.const_get("#{mode.to_s.classify}Cipher")
 
-          send(:before_validation) do |doc|
+          send(:after_validation) do |doc|
             doc.send(:write_encrypted_attribute, attr_name, cipher_class, options)
             true
           end

spec/embedded_document_spec.rb

@@ -0,0 +1,23 @@
+# -*- encoding: utf-8 -*-
+require 'spec_helper'
+
+describe "Symmetric encryption on embedded document" do
+  let(:credit_card) { CreditCard.new(:number => '0000111122224444') }
+  let(:person) { Person.new(:first_name => 'John', :last_name => 'Smith', :credit_card => credit_card) }
+
+  context "Has valid attributes" do
+    context "Before save" do
+      subject { credit_card }
+      its(:number) { should eq('0000111122224444') }
+      it { should be_valid }
+    end
+
+    context "after save" do
+      before { credit_card.save! }
+      subject { credit_card }
+      its(:number) { should be_encrypted }
+      its(:number) { should eq('0000111122224444') }
+    end
+  end
+
+end

spec/models/credit_card.rb

@@ -0,0 +1,10 @@
+class CreditCard
+  include Mongoid::Document
+  include Mongoid::Encryptor
+
+  field :number
+
+  validates_format_of :number, :with => /^\A\d{16}\z/
+
+  encrypts :number, :mode => :symmetric, :password => 'secret'
+end

spec/models/person.rb

@@ -0,0 +1,10 @@
+class Person
+  include Mongoid::Document
+
+  field :first_name
+  field :last_name
+
+  embeds_one :credit_card
+
+  validates_presence_of :first_name, :last_name
+end