# File lib/dm-validations/auto_validate.rb, line 78
      def auto_generate_validations(property)
        property.options[:auto_validation] = true unless property.options.has_key?(:auto_validation)
        return unless property.options[:auto_validation]

        # a serial property is allowed to be nil too, because the
        # value is set by the storage system
        opts = { :allow_nil => property.nullable? || property.serial? }
        opts[:context] = property.options[:validates] if property.options.has_key?(:validates)

        # presence
        unless opts[:allow_nil]
          # validates_present property.name, opts
          validates_present property.name, options_with_message(opts, property, :presence)
        end

        # length
        if property.type == String
          #len = property.length  # XXX: maybe length should always return a Range, with the min defaulting to 1
          len = property.options.fetch(:length, property.options.fetch(:size, DataMapper::Property::DEFAULT_LENGTH))
          if len.is_a?(Range)
            opts[:within] = len
          else
            opts[:maximum] = len
          end
          # validates_length property.name, opts
          validates_length property.name, options_with_message(opts, property, :length)
        end

        # format
        if property.options.has_key?(:format)
          opts[:with] = property.options[:format]
          # validates_format property.name, opts
          validates_format property.name, options_with_message(opts, property, :format)
        end

        # uniqueness validator
        if property.options.has_key?(:unique)
          value = property.options[:unique]
          if value.is_a?(Array) || value.is_a?(Symbol)
            # validates_is_unique property.name, :scope => Array(value)
            validates_is_unique property.name, options_with_message({:scope => Array(value)}, property, :is_unique)
          elsif value.is_a?(TrueClass)
            # validates_is_unique property.name
            validates_is_unique property.name, options_with_message({}, property, :is_unique)
          end
        end

        # within validator
        if property.options.has_key?(:set)
          validates_within property.name, options_with_message({:set => property.options[:set]}, property, :within)
        end

        # numeric validator
        if Integer == property.type
          opts[:integer_only] = true
          # validates_is_number property.name, opts
          validates_is_number property.name, options_with_message(opts, property, :is_number)
        elsif BigDecimal == property.type || Float == property.type
          opts[:precision] = property.precision
          opts[:scale]     = property.scale
          # validates_is_number property.name, opts
          validates_is_number property.name, options_with_message(opts, property, :is_number)
        else
          # We only need this in the case we don't already
          # have a numeric validator, because otherwise
          # it will cause duplicate validation errors
          unless property.custom?
            # validates_is_primitive property.name, opts
            validates_is_primitive property.name, options_with_message(opts, property, :is_primitive)
          end
        end
      end