Contents

module Id
  module Model
    class Field

      def initialize(model, name, options)
        @model = model
        @name = name
        @options = options
      end

      def define
        Definer.method_memoize(model, name) { |data| value_of(data) }
        Definer.method(model, "#{name}?") { |obj| presence_of(obj.data) }
        hook_define
      end

      def hook_define
      end

      def value_of(data)
        value = data.fetch(key, &default_value)
        optional ? Option[value].map{ |d| cast d } : cast(value)
      end

      def presence_of(data)
        data.has_key?(key) && data.fetch(key)
      end

      def cast(value)
        TypeCasts.cast(options.fetch(:type, false), value)
      end

      def key
        options.fetch(:key, name).to_s
      end

      def default_value
        proc do
          if default? then default
          elsif !optional? then raise MissingAttributeError, key end
        end
      end

      def default?
        options.has_key?(:default)
      end

      def default
        options.fetch(:default)
      end

      def optional?
        options.fetch(:optional, false)
      end
      alias_method :optional, :optional?

      attr_reader :model, :name, :options

    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
id-0.0.12	lib/id/model/field.rb