309 lines
9.6 KiB
Ruby
309 lines
9.6 KiB
Ruby
module ActiveRecord #:nodoc:
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module XmlSerialization
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# Builds an XML document to represent the model. Some configuration is
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# availble through +options+, however more complicated cases should use
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# override ActiveRecord's to_xml.
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#
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# By default the generated XML document will include the processing
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# instruction and all object's attributes. For example:
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#
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# <?xml version="1.0" encoding="UTF-8"?>
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# <topic>
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# <title>The First Topic</title>
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# <author-name>David</author-name>
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# <id type="integer">1</id>
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# <approved type="boolean">false</approved>
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# <replies-count type="integer">0</replies-count>
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# <bonus-time type="datetime">2000-01-01T08:28:00+12:00</bonus-time>
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# <written-on type="datetime">2003-07-16T09:28:00+1200</written-on>
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# <content>Have a nice day</content>
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# <author-email-address>david@loudthinking.com</author-email-address>
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# <parent-id></parent-id>
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# <last-read type="date">2004-04-15</last-read>
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# </topic>
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#
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# This behavior can be controlled with :only, :except,
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# :skip_instruct, :skip_types and :dasherize. The :only and
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# :except options are the same as for the #attributes method.
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# The default is to dasherize all column names, to disable this,
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# set :dasherize to false. To not have the column type included
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# in the XML output, set :skip_types to false.
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#
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# For instance:
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#
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# topic.to_xml(:skip_instruct => true, :except => [ :id, :bonus_time, :written_on, :replies_count ])
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#
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# <topic>
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# <title>The First Topic</title>
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# <author-name>David</author-name>
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# <approved type="boolean">false</approved>
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# <content>Have a nice day</content>
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# <author-email-address>david@loudthinking.com</author-email-address>
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# <parent-id></parent-id>
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# <last-read type="date">2004-04-15</last-read>
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# </topic>
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#
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# To include first level associations use :include
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#
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# firm.to_xml :include => [ :account, :clients ]
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#
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# <?xml version="1.0" encoding="UTF-8"?>
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# <firm>
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# <id type="integer">1</id>
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# <rating type="integer">1</rating>
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# <name>37signals</name>
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# <clients>
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# <client>
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# <rating type="integer">1</rating>
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# <name>Summit</name>
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# </client>
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# <client>
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# <rating type="integer">1</rating>
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# <name>Microsoft</name>
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# </client>
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# </clients>
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# <account>
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# <id type="integer">1</id>
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# <credit-limit type="integer">50</credit-limit>
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# </account>
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# </firm>
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#
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# To include any methods on the object(s) being called use :methods
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#
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# firm.to_xml :methods => [ :calculated_earnings, :real_earnings ]
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#
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# <firm>
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# # ... normal attributes as shown above ...
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# <calculated-earnings>100000000000000000</calculated-earnings>
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# <real-earnings>5</real-earnings>
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# </firm>
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#
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# To call any Proc's on the object(s) use :procs. The Proc's
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# are passed a modified version of the options hash that was
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# given to #to_xml.
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#
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# proc = Proc.new { |options| options[:builder].tag!('abc', 'def') }
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# firm.to_xml :procs => [ proc ]
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#
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# <firm>
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# # ... normal attributes as shown above ...
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# <abc>def</abc>
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# </firm>
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#
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# You may override the to_xml method in your ActiveRecord::Base
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# subclasses if you need to. The general form of doing this is
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#
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# class IHaveMyOwnXML < ActiveRecord::Base
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# def to_xml(options = {})
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# options[:indent] ||= 2
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# xml = options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
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# xml.instruct! unless options[:skip_instruct]
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# xml.level_one do
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# xml.tag!(:second_level, 'content')
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# end
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# end
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# end
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def to_xml(options = {})
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XmlSerializer.new(self, options).to_s
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end
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end
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class XmlSerializer #:nodoc:
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attr_reader :options
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def initialize(record, options = {})
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@record, @options = record, options.dup
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end
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def builder
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@builder ||= begin
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options[:indent] ||= 2
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builder = options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
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unless options[:skip_instruct]
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builder.instruct!
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options[:skip_instruct] = true
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end
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builder
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end
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end
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def root
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root = (options[:root] || @record.class.to_s.underscore).to_s
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dasherize? ? root.dasherize : root
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end
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def dasherize?
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!options.has_key?(:dasherize) || options[:dasherize]
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end
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# To replicate the behavior in ActiveRecord#attributes,
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# :except takes precedence over :only. If :only is not set
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# for a N level model but is set for the N+1 level models,
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# then because :except is set to a default value, the second
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# level model can have both :except and :only set. So if
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# :only is set, always delete :except.
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def serializable_attributes
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attribute_names = @record.attribute_names
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if options[:only]
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options.delete(:except)
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attribute_names = attribute_names & Array(options[:only]).collect { |n| n.to_s }
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else
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options[:except] = Array(options[:except]) | Array(@record.class.inheritance_column)
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attribute_names = attribute_names - options[:except].collect { |n| n.to_s }
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end
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attribute_names.collect { |name| Attribute.new(name, @record) }
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end
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def serializable_method_attributes
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Array(options[:methods]).collect { |name| MethodAttribute.new(name.to_s, @record) }
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end
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def add_attributes
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(serializable_attributes + serializable_method_attributes).each do |attribute|
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add_tag(attribute)
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end
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end
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def add_includes
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if include_associations = options.delete(:include)
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root_only_or_except = { :except => options[:except],
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:only => options[:only] }
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include_has_options = include_associations.is_a?(Hash)
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for association in include_has_options ? include_associations.keys : Array(include_associations)
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association_options = include_has_options ? include_associations[association] : root_only_or_except
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opts = options.merge(association_options)
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case @record.class.reflect_on_association(association).macro
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when :has_many, :has_and_belongs_to_many
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records = @record.send(association).to_a
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unless records.empty?
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tag = records.first.class.to_s.underscore.pluralize
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tag = tag.dasherize if dasherize?
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builder.tag!(tag) do
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records.each { |r| r.to_xml(opts.merge(:root => association.to_s.singularize)) }
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end
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end
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when :has_one, :belongs_to
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if record = @record.send(association)
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record.to_xml(opts.merge(:root => association))
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end
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end
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end
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options[:include] = include_associations
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end
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end
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def add_procs
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if procs = options.delete(:procs)
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[ *procs ].each do |proc|
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proc.call(options)
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end
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end
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end
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def add_tag(attribute)
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builder.tag!(
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dasherize? ? attribute.name.dasherize : attribute.name,
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attribute.value.to_s,
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attribute.decorations(!options[:skip_types])
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)
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end
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def serialize
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args = [root]
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if options[:namespace]
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args << {:xmlns=>options[:namespace]}
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end
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builder.tag!(*args) do
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add_attributes
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add_includes
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add_procs
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end
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end
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alias_method :to_s, :serialize
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class Attribute #:nodoc:
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attr_reader :name, :value, :type
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def initialize(name, record)
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@name, @record = name, record
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@type = compute_type
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@value = compute_value
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end
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# There is a significant speed improvement if the value
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# does not need to be escaped, as #tag! escapes all values
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# to ensure that valid XML is generated. For known binary
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# values, it is at least an order of magnitude faster to
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# Base64 encode binary values and directly put them in the
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# output XML than to pass the original value or the Base64
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# encoded value to the #tag! method. It definitely makes
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# no sense to Base64 encode the value and then give it to
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# #tag!, since that just adds additional overhead.
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def needs_encoding?
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![ :binary, :date, :datetime, :boolean, :float, :integer ].include?(type)
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end
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def decorations(include_types = true)
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decorations = {}
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if type == :binary
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decorations[:encoding] = 'base64'
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end
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if include_types && type != :string
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decorations[:type] = type
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end
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decorations
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end
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protected
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def compute_type
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type = @record.class.columns_hash[name].type
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case type
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when :text
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:string
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when :time
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:datetime
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else
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type
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end
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end
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def compute_value
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value = @record.send(name)
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if formatter = Hash::XML_FORMATTING[type.to_s]
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value ? formatter.call(value) : nil
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else
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value
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end
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end
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end
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class MethodAttribute < Attribute #:nodoc:
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protected
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def compute_type
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Hash::XML_TYPE_NAMES[@record.send(name).class.name] || :string
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end
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end
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end
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end
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