Contents

module CurationConcerns
  module UploadSetBehavior
    extend ActiveSupport::Concern
    include Hydra::AccessControls::Permissions
    include CurationConcerns::Noid

    included do
      has_many :file_sets, predicate: ActiveFedora::RDF::Fcrepo::RelsExt.isPartOf

      property :creator, predicate: ::RDF::DC.creator
      property :title, predicate: ::RDF::DC.title
      property :status, predicate: ::RDF::DC.type
    end

    module ClassMethods
      def find_or_create(id)
        UploadSet.find(id)
      rescue ActiveFedora::ObjectNotFoundError
        safe_create(id)
      end

      private

        # This method handles most race conditions gracefully.
        # If an upload_set with the same ID is created by another thread
        # we fetch the upload_set that was created (rather than throwing
        # an error) and continute.
        def safe_create(id)
          UploadSet.create(id: id)
        rescue ActiveFedora::IllegalOperation
          # This is the exception thrown by LDP when we attempt to
          # create a duplicate object. If we can find the object
          # then we are good to go.
          UploadSet.find(id)
        end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
curation_concerns-models-0.3.0	app/models/concerns/curation_concerns/upload_set_behavior.rb
curation_concerns-models-0.2.0	app/models/concerns/curation_concerns/upload_set_behavior.rb