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# encoding: utf-8
require 'dynamoid/indexes/index'
module Dynamoid #:nodoc:
# Indexes are quick ways of performing queries by anything other than id in DynamoDB. They are denormalized tables;
# that is, data is duplicated in the initial table (where the object is saved) and the index table (where
# we perform indexing).
module Indexes
extend ActiveSupport::Concern
# Make some helpful attributes to persist indexes.
included do
class_attribute :indexes
self.indexes = {}
end
module ClassMethods
# The call to create an index. Generates a new index with the specified options -- for more information, see Dynamoid::Indexes::Index.
# This function also attempts to immediately create the indexing table if it does not exist already.
#
# @since 0.2.0
def index(name, options = {})
index = Dynamoid::Indexes::Index.new(self, name, options)
self.indexes[index.name] = index
create_indexes
end
# Helper function to find indexes.
#
# @since 0.2.0
def find_index(index)
self.indexes[Array(index).collect(&:to_s).sort.collect(&:to_sym)]
end
# Helper function to create indexes (if they don't exist already).
#
# @since 0.2.0
def create_indexes
self.indexes.each do |name, index|
opts = {:table_name => index.table_name, :id => :id}
opts[:range_key] = { :range => :number } if index.range_key?
self.create_table(opts)
end
end
end
# Callback for an object to save itself to each of a class' indexes.
#
# @since 0.2.0
def save_indexes
self.class.indexes.each do |name, index|
index.save(self)
end
end
# Callback for an object to delete itself from each of a class' indexes.
#
# @since 0.2.0
def delete_indexes
self.class.indexes.each do |name, index|
index.delete(self)
end
end
end
end
Version data entries
13 entries across 13 versions & 3 rubygems