has_secure_password shouldn't validate password_digest. It should als…

…o take options to turn validations off.

activemodel/lib/active_model/secure_password.rb

@@ -6,8 +6,9 @@ module ClassMethods
       # Adds methods to set and authenticate against a BCrypt password.
       # This mechanism requires you to have a password_digest attribute.
       #
-      # Validations for presence of password, confirmation of password (using
+      # Validations for presence of password on create, confirmation of password (using
       # a "password_confirmation" attribute) are automatically added.
+      # If you wish to turn off validations, pass 'validations: false' as an argument.
       # You can add more validations by hand if need be.
       #
       # You need to add bcrypt-ruby (~> 3.0.0) to Gemfile to use has_secure_password:
@@ -31,16 +32,20 @@ module ClassMethods
       #   user.authenticate("mUc3m00RsqyRe")                             # => user
       #   User.find_by_name("david").try(:authenticate, "notright")      # => false
       #   User.find_by_name("david").try(:authenticate, "mUc3m00RsqyRe") # => user
-      def has_secure_password
+      def has_secure_password(options = {})
         # Load bcrypt-ruby only when has_secure_password is used.
         # This is to avoid ActiveModel (and by extension the entire framework) being dependent on a binary library.
         gem 'bcrypt-ruby', '~> 3.0.0'
         require 'bcrypt'
 
         attr_reader :password
-
-        validates_confirmation_of :password
-        validates_presence_of     :password_digest
+
+        if options.fetch(:validations, true)
+          validates_confirmation_of :password
+          validates_presence_of     :password, :on => :create
+        end
+
+        before_create { raise "Password digest missing on new record" if password_digest.blank? }
 
         include InstanceMethodsOnActivation