Contents

# NB index instances are all internal to zermelo, not user-accessible

require 'zermelo/records/key'

module Zermelo
  module Associations
    class Index

      def initialize(parent_klass, name)
        @parent_klass   = parent_klass
        @attribute_name = name

        @backend   = parent_klass.send(:backend)

        @indexers = {}

        parent_klass.send(:with_index_data, name.to_sym) do |data|
          @attribute_type = data.type
        end
      end

      def delete_id(id, value)
        return unless indexer = key(value)
        @backend.delete(indexer, id)
      end

      def add_id(id, value)
        return unless indexer = key(value)
        @backend.add(indexer, id)
      end

      def move_id(id, value_from, indexer_to, value_to)
        return unless indexer = key(value_from)
        @backend.move(indexer, id, indexer_to.key(value_to), id)
      end

      def key(value)
        index_keys = @backend.index_keys(@attribute_type, value)
        raise "Can't index '#{@value}' (#{@attribute_type}" if index_keys.nil?

        @indexers[index_keys.join(":")] ||= Zermelo::Records::Key.new(
          :klass  => @parent_klass,
          :name   => "by_#{@attribute_name}:#{index_keys.join(':')}",
          :type   => :set,
          :object => :index
        )
      end

    end
  end
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
zermelo-1.4.1	lib/zermelo/associations/index.rb
zermelo-1.4.0	lib/zermelo/associations/index.rb
zermelo-1.3.0	lib/zermelo/associations/index.rb
zermelo-1.2.1	lib/zermelo/associations/index.rb
zermelo-1.2.0	lib/zermelo/associations/index.rb