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Versions: 14
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Contents
# frozen_string_literal: true
module Hyrax
module Works
class MigrationService
# @api public
#
# Migrate data stored in FCrepo from one predicate to another
# The main use case is where the predicate used for a specific property is changed.
# Data already stored in Fedora under the original predicate needs to be transfered
# and the original data cleaned up.
def self.migrate_predicate(predicate_from, predicate_to, works_to_update = ActiveFedora::Base.all)
migrated = 0
Hyrax.logger.info "*** Migrating #{predicate_from} to #{predicate_to} in #{works_to_update.count} works"
works_to_update.each do |work|
next unless work.ldp_source.content.include?(predicate_from.to_s)
migrate_data(predicate_from, predicate_to, work)
migrated += 1
end
Hyrax.logger.info "--- Migration Complete (#{migrated} migrated)"
end
# @api private
#
# Migrate data
def self.migrate_data(predicate_from, predicate_to, work)
orm = Ldp::Orm.new(work.ldp_source)
orm.value(predicate_from).each { |val| orm.graph.insert([orm.resource.subject_uri, predicate_to, val.to_s]) }
orm.graph.delete([orm.resource.subject_uri, predicate_from, nil])
orm.save
Hyrax.logger.info " Data migrated from #{predicate_from} to #{predicate_to} - id: #{work.id}"
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems