nested attributes demo

demo.rb

#!/usr/bin/env ruby

require "active-fedora"

class MADS < RDF::Vocabulary("http://www.loc.gov/mads/rdf/v1#")
  property :ComplexSubject
  property :MADSScheme
  property :MainTitleElement
  property :SubTitleElement
  property :Temporal
  property :TemporalElement
  property :Title
  property :Topic
  property :TopicElement
  property :authoritativeLabel
  property :componentList
  property :elementList
  property :elementValue
  property :hasExactExternalAuthority
  property :isMemberOfMADSScheme
end
class MadsMainTitleElement
  include ActiveFedora::RdfObject
  rdf_type MADS.MainTitleElement
  map_predicates do |map|
    map.elementValue(:in=> MADS)
  end
end
class MadsSubTitleElement
  include ActiveFedora::RdfObject
  rdf_type MADS.SubTitleElement
  map_predicates do |map|
    map.elementValue(:in=> MADS)
  end
end
class MadsTemporalElement
  include ActiveFedora::RdfObject
  rdf_type MADS.TemporalElement
  map_predicates do |map|
    map.elementValue(:in=> MADS)
  end
end
class MadsTopicElement
  include ActiveFedora::RdfObject
  rdf_type MADS.TopicElement
  map_predicates do |map|
    map.elementValue(:in=> MADS)
  end
end
class MadsElementList
  include ActiveFedora::RdfList
  map_predicates do |map|
    map.mainTitleElement(:in=> MADS, :to =>"MainTitleElement", :class_name => "MadsMainTitleElement")
    map.temporalElement(:in=> MADS, :to =>"TemporalElement", :class_name => "MadsTemporalElement")
    map.topicElement(:in=> MADS, :to =>"TopicElement", :class_name => "MadsTopicElement")
    map.subTitleElement(:in=> MADS, :to =>"SubTitleElement", :class_name => "MadsSubTitleElement")
  end
  accepts_nested_attributes_for :mainTitleElement, :subTitleElement, :temporalElement, :topicElement
end
class MadsTemporal 
  include ActiveFedora::RdfObject
  rdf_type MADS.Temporal
  map_predicates do |map|
    map.label(:in => MADS, :to => 'authoritativeLabel')
    map.scheme(:in => MADS, :to => 'isMemberOfMADSScheme')
    map.externalAuthority(:in => MADS, :to => 'hasExactExternalAuthority')
    map.elementList(:in => MADS, :class_name=>'MadsElementList')
  end
  accepts_nested_attributes_for :elementList
end
class MadsTitle 
  include ActiveFedora::RdfObject
  rdf_type MADS.Title
  map_predicates do |map|
    map.label(:in => MADS, :to => 'authoritativeLabel')
    map.scheme(:in => MADS, :to => 'isMemberOfMADSScheme')
    map.externalAuthority(:in => MADS, :to => 'hasExactExternalAuthority')
    map.elementList(:in => MADS, :class_name=>'MadsElementList')
  end
  accepts_nested_attributes_for :elementList
end
class MadsTopic 
  include ActiveFedora::RdfObject
  rdf_type MADS.Topic
  map_predicates do |map|
    map.label(:in => MADS, :to => 'authoritativeLabel')
    map.scheme(:in => MADS, :to => 'isMemberOfMADSScheme')
    map.externalAuthority(:in => MADS, :to => 'hasExactExternalAuthority')
    map.elementList(:in => MADS, :class_name=>'MadsElementList')
  end
  accepts_nested_attributes_for :elementList
end
class MadsComponentList
  include ActiveFedora::RdfList
  map_predicates do |map|
    map.temporal(:in=> MADS, :to =>"Temporal", :class_name => "MadsTemporal")
    map.topic(:in=> MADS, :to =>"Topic", :class_name => "MadsTopic")
  end
  accepts_nested_attributes_for :temporal, :topic
end
class MadsComplexSubject
  include ActiveFedora::RdfObject
  rdf_type MADS.ComplexSubject
  map_predicates do |map|
    map.label(:in => MADS, :to => 'authoritativeLabel')
    map.externalAuthority(:in => MADS, :to => 'hasExactExternalAuthority')
    map.componentList(:in => MADS, :class_name=>'MadsComponentList')
  end
  accepts_nested_attributes_for :componentList
end

# complex subject
# TODO: repeated components of the same type not working
# TODO: multiple components breaks rdf:list
exturi = RDF::Resource.new "http://id.loc.gov/authorities/subjects/sh85148221"
scheme = RDF::Resource.new "http://library.ucsd.edu/ark:/20775/bb1234567x"
params = {
  complexSubject: {
    label: "World politics--20th Century",
    scheme: scheme,
    externalAuthority: exturi,
    componentList_attributes: [
      topic_attributes: {
        label: "World politics",
        elementList_attributes: [
          topicElement_attributes: [{ elementValue: "World politics" }]
        ]
      },
      temporal_attributes: {
        label: "20th Century",
        elementList_attributes: [
          temporalElement_attributes: [{ elementValue: "20th Century"}],
        ]
      }
    ]
  }
}
subject = MadsComplexSubject.new(RDF::Graph.new)
subject.attributes = params[:complexSubject]
puts subject.graph.dump(:ntriples)

# title
# TODO: multiple elements breaks rdf:list
scheme = RDF::Resource.new "http://library.ucsd.edu/ark:/20775/bb1234567x"
params = {
  title: {
    label: "The Hobbit: Or, There and Back Again",
    scheme: scheme,
    elementList_attributes: [
      mainTitleElement_attributes: [{ elementValue: "The Hobbit" }]
    ]
  }
}
#subTitleElement_attributes: [{ elementValue: "Or, There and Back Again" }]
title = MadsTitle.new(RDF::Graph.new)
title.attributes = params[:title]
puts title.graph.dump(:ntriples)

# topic
exturi = RDF::Resource.new "http://id.loc.gov/authorities/subjects/sh85124118"
scheme = RDF::Resource.new "http://library.ucsd.edu/ark:/20775/bb1234567x"
params = {
  topic: {
    label: "Socialism",
    externalAuthority: exturi,
    scheme: scheme,
    elementList_attributes: [
      topicElement_attributes: [{ elementValue: "Socialism" }]
    ]
  }
}
topic = MadsTopic.new(RDF::Graph.new)
topic.attributes = params[:topic]
puts topic.graph.dump(:ntriples)

Gemfile

source 'https://rubygems.org'

gem 'rails', '3.2.13'
gem "active-fedora", :git => "git://github.com/projecthydra/active_fedora.git"