Module: Transferable

Defined in:

backend/app/model/mixins/transferable.rb

Instance Method Summary

• #transfer_to_repository(repository, transfer_group = []) ⇒ Object

Instance Method Details

#transfer_to_repository(repository, transfer_group = []) ⇒ Object

# File 'backend/app/model/mixins/transferable.rb', line 3

def transfer_to_repository(repository, transfer_group = [])
  events_to_clone = []
  assessments_to_clone = []
  containers_to_clone = {}

  graph = self.object_graph

  ## Digital object instances will trigger their linked digital objects to
  ## transfer too, as long as those digital objects aren't linked to by other
  ## records.

  # We skip over tree nodes because the root record will take care of
  # transferring their linked digital objects.
  unless self.class.included_modules.include?(TreeNodes)
    do_instance_relationship = Instance.find_relationship(:instance_do_link)

    # The list of instance record IDs connected to our transferee
    instance_ids = graph.ids_for(Instance)

    # The list of digital objects our transferee links to
    linked_digital_objects = do_instance_relationship
                             .filter(:id => graph.ids_for(do_instance_relationship))
                             .select(:digital_object_id)
                             .map {|row| row[:digital_object_id]}

    # The list of instance IDs that link to those digital objects (which may or
    # may not be connected to our transferee)
    instances_referencing_digital_objects = do_instance_relationship
                                            .find_by_participant_ids(DigitalObject, linked_digital_objects)
                                            .map {|r| r.instance_id}


    linked_instances_outside_transfer_set = (instances_referencing_digital_objects - instance_ids)

    if linked_instances_outside_transfer_set.empty?
      # Our record to be transferred is the only thing referencing the digital
      # objects it links to.  We can safely migrate them as well.

      DigitalObject.any_repo.filter(:id => linked_digital_objects).each do |digital_object|
        digital_object.transfer_to_repository(repository, transfer_group + [self])
      end
    else
      # Abort the transfer and provide the list of top-level records that are
      # preventing it from completing.
      exception = TransferConstraintError.new

      ASModel.all_models.each do |model|
        next unless model.associations.include?(:instance)

        model
          .eager_graph(:instance)
          .filter(:instance__id => linked_instances_outside_transfer_set)
          .select(Sequel.qualify(model.table_name, :id))
          .each do |row|
          exception.add_conflict(model.my_jsonmodel.uri_for(row[:id], :repo_id => self.class.active_repository),
                                 {:json_property => 'instances',
                                  :message => "DIGITAL_OBJECT_IN_USE"})
        end
      end

      raise exception
    end
  end

  ## Event records will be transferred if they only link to records that are
  ## being transferred too.  Otherwise, we clone the event.
  Event.find_relationship(:event_link).who_participates_with(self).each do |event|
    linked_records = event.related_records(:event_link)

    if linked_records.length == 1
      # Events whose linked_records list contains only the record being
      # transferred should themselves be transferred.
      event.transfer_to_repository(repository, transfer_group + [self])
    else
      event_json = Event.to_jsonmodel(event)
      event_role = event_json.linked_records.find {|link| link['ref'] == self.uri}['role']

      events_to_clone << {:event => event_json, :role => event_role}
    end
  end

  ## As with events, Assessment records will be transferred if they only link
  ## to records that are being transferred too.  Otherwise, we clone the
  ## assessment in the target repository.
  Assessment.find_relationship(:assessment).who_participates_with(self).each do |assessment|
    linked_records = assessment.related_records(:assessment)

    if linked_records.length == 1
      # Assessments whose linked_records list contains only the record being
      # transferred should themselves be transferred.
      assessment.transfer_to_repository(repository, transfer_group + [self])
    else
      assessment_json = Assessment.to_jsonmodel(assessment)

      assessments_to_clone << {:assessment => assessment_json}
    end
  end

  ## Transfer any top containers that aren't linked outside of the record set
  ## being cloned.  For any other linked top containers, we'll clone them in
  ## the target repository (much like events).

  # the relationship between SC and TCs
  topcon_rlshp = SubContainer.find_relationship(:top_container_link)
  # now we get  all the relationships in this graph
  all_ids = graph.ids_for(topcon_rlshp)
  # add any conflicts to this, then raise unless it is empty
  error = TransferConstraintError.new
  top_container_transferees = []

  DB.open do |db|
    # Find relationships that are in our set of IDs that haven't been
    # transferred yet
    db[:top_container_link_rlshp]
      .join(:top_container, :id => :top_container_id)
      .filter(:top_container_link_rlshp__id => all_ids)
      .filter(:top_container__repo_id => self.class.active_repository)
      .each do |tc_rel|

      top_container = TopContainer.this_repo.filter(id: tc_rel[:top_container_id]).first
      # Already transferred
      next unless top_container

      # lets get all this container's links outside transferred object's graph
      number_of_tc_links = db[:top_container_link_rlshp]
                           .join(:top_container, :id => :top_container_id)
                           .filter(:top_container__repo_id => self.class.active_repository)
                           .filter(:top_container_id => tc_rel[:top_container_id])
                           .exclude(:top_container_link_rlshp__id => all_ids)
                           .count

      # this tc linked beyond this graph..so it's an error
      if number_of_tc_links > 0
        # ANW-979
        # Cancel transfer and let user know that they must unlink other top container
        error.add_conflict(top_container.uri, message: "TOP_CONTAINER_IN_USE")
      end

      if top_container.barcode && TopContainer.any_repo[:barcode => top_container.barcode, :repo_id => repository.id]
        # There's already a top container with our barcode in the target
        # repository.  Not sure if merging them is the right strategy or
        # not, so throwing an error for now
        error.add_conflict("#{top_container.uri}", message: "BARCODE_IN_USE")
      end

      top_container_transferees << top_container
    end
    raise error unless error.conflicts.empty?

    top_container_transferees.each do |top_container|
      top_container.transfer_to_repository(repository, transfer_group + [self]) # i guess we always add self just in case. dups are uniqed out.
    end
  end

  ## Transfer the current record
  super

  ## Clone the top containers that we marked for cloning
  containers_to_clone.each do |tc_to_clone, sces|
    # we copy the TC to be cloned
    hash = TopContainer.to_jsonmodel(tc_to_clone).to_hash(:trusted)

    # we make the TC in the new repo context
    RequestContext.open(:repo_id => repository.id) do
      tc = nil

      # but first lets check if this exists already by barcode
      if hash["barcode"]
        tc = TopContainer.for_barcode(hash["barcode"])
      end

      # not found, we make the clone
      unless tc
        tc = TopContainer.create_from_json(JSONModel(:top_container).from_hash(hash),
                                           :repo_id => repository.id)
      end

      # now we linke the clone to all the sub_containers
      sces.each do |sc|
        # the record is broken now, so we have to shuck it in the backdoor
        DB.open do |db|
          db[:top_container_link_rlshp].insert(:top_container_id => tc.id,
                                               :system_mtime => Time.now,
                                               :user_mtime => Time.now,
                                               :sub_container_id => sc)
        end
      end
    end
  end

  ## Clone any required events and assessments in the new repository
  RequestContext.open(:repo_id => repository.id) do
    # Events
    events_to_clone.each do |to_clone|
      event = to_clone[:event].to_hash(:trusted).
              merge('linked_records' => [{
                                           'ref' => self.uri,
                                           'role' => to_clone[:role]
                                         }])

      Event.create_from_json(JSONModel(:event).from_hash(event),
                             :repo_id => repository.id)
    end

    # Assessments
    assessments_to_clone.each do |to_clone|
      assessment = to_clone[:assessment].to_hash(:trusted).
                     merge('records' => [{
                                           'ref' => self.uri,
                                         }])

      # Note: we use JSONModel#new here and not from_hash because we want to
      # keep the readonly attribute (like attribute labels).  The clone needs
      # access to those for the sake of cross-repository attribute matching.
      Assessment.clone_from_json(JSONModel(:assessment).new(assessment),
                                 :repo_id => repository.id)
    end
  end
end