# Monkey patch for datamapper version 0.9.10
#
# Allow the validates_present validator
# to check for blank BCryptHash passwords.
#
# class User
#   include DataMapper::Resource
#   property :id, Serial
#   property :password, BCryptHash
#   validates_present :password
# end
#
# user = User.new
# user.password  = nil;   user.valid? => false
# user.password  = "";    user.valid? => false
# user.password  = "  ";  user.valid? => false
# user.password  = "x";   user.valid? => true
# user.password  = " x "; user.valid? => true
# user.password == " x "              => true
# user.password == "x"                => false
#

require 'dm-types/bcrypt_hash'
module DataMapper
  module Types
    class BCryptHash
      class << self
        alias_method :old_non_blank_check_self_typecast, :typecast
      end
      def self.typecast(value, property)
        value = nil if value.respond_to?(:blank?) && value.blank?
        old_non_blank_check_self_typecast(value, property)
      end
    end
  end
end