lib/ripple/serialization.rb
# Copyright 2010-2011 Sean Cribbs and Basho Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'active_support/concern'
require 'active_model/serialization'
require 'active_model/serializers/json'
module Ripple
# Provides methods for serializing Ripple documents to external
# formats (e.g. JSON). By default, embedded documents will be
# included in the resulting format.
module Serialization
extend ActiveSupport::Concern
include ::ActiveModel::Serializers::JSON
# Creates a Hash suitable for conversion to an external format.
# @param [Hash] options (nil) serialization options
# @option options [Array<Symbol>] :only emit only the specified attributes
# @option options [Array<Symbol>] :except omit the specified attributes
# @option options [Array<Symbol>, Hash] :include include the
# specified associations (with or without extra
# options). This defaults to all embedded associations.
# @return [Hash] a hash of attributes and embedded documents
def serializable_hash(options=nil)
options = options.try(:clone) || {}
unless options.has_key?(:include)
options[:include] = self.class.embedded_associations.map(&:name)
end
hash = super(options)
hash['key'] = key if respond_to?(:key) && key.present? && (!options[:except] || !options[:except].map(&:to_s).include?("key"))
serializable_add_includes(options) do |association, records, opts|
hash[association.to_s] = records.is_a?(Enumerable) ? records.map {|r| r.serializable_hash(opts) } : records.serializable_hash(opts)
end
hash
end
private
def serializable_add_includes(options={})
return unless include_associations = options.delete(:include)
base_only_or_except = {
:except => options[:except],
:only => options[:only]
}
include_has_options = include_associations.is_a?(Hash)
associations = include_has_options ? include_associations.keys : Array.wrap(include_associations)
for association in associations
records = case self.class.associations[association.to_sym].type
when :many
send(association).to_a
when :one
send(association)
end
unless records.nil?
association_options = include_has_options ? include_associations[association] : base_only_or_except
opts = options.merge(association_options)
yield(association, records, opts)
end
end
options[:include] = include_associations
end
end
end