require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/hash/conversions'
module ActiveRecord #:nodoc:
module Serialization
include ActiveModel::Serializers::Xml
# Builds an XML document to represent the model. Some configuration is
# available through +options+. However more complicated cases should
# override ActiveRecord::Base#to_xml.
#
# By default the generated XML document will include the processing
# instruction and all the object's attributes. For example:
#
#
#
# The First Topic
# David
# 1
# false
# 0
# 2000-01-01T08:28:00+12:00
# 2003-07-16T09:28:00+1200
# Have a nice day
# david@loudthinking.com
#
# 2004-04-15
#
#
# This behavior can be controlled with :only, :except,
# :skip_instruct, :skip_types, :dasherize and :camelize .
# The :only and :except options are the same as for the
# +attributes+ method. The default is to dasherize all column names, but you
# can disable this setting :dasherize to +false+. Setting :camelize
# to +true+ will camelize all column names - this also overrides :dasherize.
# To not have the column type included in the XML output set :skip_types to +true+.
#
# For instance:
#
# topic.to_xml(:skip_instruct => true, :except => [ :id, :bonus_time, :written_on, :replies_count ])
#
#
# The First Topic
# David
# false
# Have a nice day
# david@loudthinking.com
#
# 2004-04-15
#
#
# To include first level associations use :include:
#
# firm.to_xml :include => [ :account, :clients ]
#
#
#
# 1
# 1
# 37signals
#
#
# 1
# Summit
#
#
# 1
# Microsoft
#
#
#
# 1
# 50
#
#
#
# Additionally, the record being serialized will be passed to a Proc's second
# parameter. This allows for ad hoc additions to the resultant document that
# incorporate the context of the record being serialized. And by leveraging the
# closure created by a Proc, to_xml can be used to add elements that normally fall
# outside of the scope of the model -- for example, generating and appending URLs
# associated with models.
#
# proc = Proc.new { |options, record| options[:builder].tag!('name-reverse', record.name.reverse) }
# firm.to_xml :procs => [ proc ]
#
#
# # ... normal attributes as shown above ...
# slangis73
#
#
# To include deeper levels of associations pass a hash like this:
#
# firm.to_xml :include => {:account => {}, :clients => {:include => :address}}
#
#
# 1
# 1
# 37signals
#
#
# 1
# Summit
#
# ...
#
#
#
# 1
# Microsoft
#
# ...
#
#
#
#
# 1
# 50
#
#
#
# To include any methods on the model being called use :methods:
#
# firm.to_xml :methods => [ :calculated_earnings, :real_earnings ]
#
#
# # ... normal attributes as shown above ...
# 100000000000000000
# 5
#
#
# To call any additional Procs use :procs. The Procs are passed a
# modified version of the options hash that was given to +to_xml+:
#
# proc = Proc.new { |options| options[:builder].tag!('abc', 'def') }
# firm.to_xml :procs => [ proc ]
#
#
# # ... normal attributes as shown above ...
# def
#
#
# Alternatively, you can yield the builder object as part of the +to_xml+ call:
#
# firm.to_xml do |xml|
# xml.creator do
# xml.first_name "David"
# xml.last_name "Heinemeier Hansson"
# end
# end
#
#
# # ... normal attributes as shown above ...
#
# David
# Heinemeier Hansson
#
#
#
# As noted above, you may override +to_xml+ in your ActiveRecord::Base
# subclasses to have complete control about what's generated. The general
# form of doing this is:
#
# class IHaveMyOwnXML < ActiveRecord::Base
# def to_xml(options = {})
# options[:indent] ||= 2
# xml = options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
# xml.instruct! unless options[:skip_instruct]
# xml.level_one do
# xml.tag!(:second_level, 'content')
# end
# end
# end
def to_xml(options = {}, &block)
XmlSerializer.new(self, options).serialize(&block)
end
end
class XmlSerializer < ActiveModel::Serializers::Xml::Serializer #:nodoc:
def initialize(*args)
super
options[:except] |= Array.wrap(@serializable.class.inheritance_column)
end
def add_extra_behavior
add_includes
end
def add_includes
procs = options.delete(:procs)
@serializable.send(:serializable_add_includes, options) do |association, records, opts|
add_associations(association, records, opts)
end
options[:procs] = procs
end
# TODO This can likely be cleaned up to simple use ActiveSupport::XmlMini.to_tag as well.
def add_associations(association, records, opts)
association_name = association.to_s.singularize
merged_options = options.merge(opts).merge!(:root => association_name)
if records.is_a?(Enumerable)
tag = ActiveSupport::XmlMini.rename_key(association.to_s, options)
type = options[:skip_types] ? { } : {:type => "array"}
if records.empty?
@builder.tag!(tag, type)
else
@builder.tag!(tag, type) do
records.each do |record|
if options[:skip_types]
record_type = {}
else
record_class = (record.class.to_s.underscore == association_name) ? nil : record.class.name
record_type = {:type => record_class}
end
record.to_xml merged_options.merge(record_type)
end
end
end
elsif record = @serializable.send(association)
record.to_xml(merged_options)
end
end
class Attribute < ActiveModel::Serializers::Xml::Serializer::Attribute #:nodoc:
def compute_type
type = @serializable.class.serialized_attributes.has_key?(name) ?
super : @serializable.class.columns_hash[name].type
case type
when :text
:string
when :time
:datetime
else
type
end
end
protected :compute_type
end
end
end