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require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/class/attribute_accessors'
require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/hash/conversions'
require 'active_support/core_ext/hash/slice'
module ActiveModel
# == Active Model XML Serializer
module Serializers
module Xml
extend ActiveSupport::Concern
include ActiveModel::Serialization
class Serializer #:nodoc:
class Attribute #:nodoc:
attr_reader :name, :value, :type
def initialize(name, serializable, raw_value=nil)
@name, @serializable = name, serializable
@value = value || @serializable.send(name)
@type = compute_type
end
def decorations
decorations = {}
decorations[:encoding] = 'base64' if type == :binary
decorations[:type] = type unless type == :string
decorations[:nil] = true if value.nil?
decorations
end
protected
def compute_type
type = ActiveSupport::XmlMini::TYPE_NAMES[value.class.name]
type ||= :string if value.respond_to?(:to_str)
type ||= :yaml
type
end
end
class MethodAttribute < Attribute #:nodoc:
end
attr_reader :options
def initialize(serializable, options = nil)
@serializable = serializable
@options = options ? options.dup : {}
@options[:only] = Array.wrap(@options[:only]).map { |n| n.to_s }
@options[:except] = Array.wrap(@options[:except]).map { |n| n.to_s }
end
# To replicate the behavior in ActiveRecord#attributes, <tt>:except</tt>
# takes precedence over <tt>:only</tt>. If <tt>:only</tt> is not set
# for a N level model but is set for the N+1 level models,
# then because <tt>:except</tt> is set to a default value, the second
# level model can have both <tt>:except</tt> and <tt>:only</tt> set. So if
# <tt>:only</tt> is set, always delete <tt>:except</tt>.
def attributes_hash
attributes = @serializable.attributes
if options[:only].any?
attributes.slice(*options[:only])
elsif options[:except].any?
attributes.except(*options[:except])
else
attributes
end
end
def serializable_attributes
attributes_hash.map do |name, value|
self.class::Attribute.new(name, @serializable, value)
end
end
def serializable_methods
Array.wrap(options[:methods]).inject([]) do |methods, name|
methods << self.class::MethodAttribute.new(name.to_s, @serializable) if @serializable.respond_to?(name.to_s)
methods
end
end
def serialize
require 'builder' unless defined? ::Builder
options[:indent] ||= 2
options[:builder] ||= ::Builder::XmlMarkup.new(:indent => options[:indent])
@builder = options[:builder]
@builder.instruct! unless options[:skip_instruct]
root = (options[:root] || @serializable.class.model_name.element).to_s
root = ActiveSupport::XmlMini.rename_key(root, options)
args = [root]
args << {:xmlns => options[:namespace]} if options[:namespace]
args << {:type => options[:type]} if options[:type] && !options[:skip_types]
@builder.tag!(*args) do
add_attributes_and_methods
add_extra_behavior
add_procs
yield @builder if block_given?
end
end
private
def add_extra_behavior
end
def add_attributes_and_methods
(serializable_attributes + serializable_methods).each do |attribute|
key = ActiveSupport::XmlMini.rename_key(attribute.name, options)
ActiveSupport::XmlMini.to_tag(key, attribute.value,
options.merge(attribute.decorations))
end
end
def add_procs
if procs = options.delete(:procs)
Array.wrap(procs).each do |proc|
if proc.arity == 1
proc.call(options)
else
proc.call(options, @serializable)
end
end
end
end
end
# Returns XML representing the model. Configuration can be
# passed through +options+.
def to_xml(options = {}, &block)
Serializer.new(self, options).serialize(&block)
end
def from_xml(xml)
self.attributes = Hash.from_xml(xml).values.first
self
end
end
end
end
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