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Contents
# frozen_string_literal: true
module Hyrax
module CustomQueries
module Navigators
##
# Navigate from a resource to it's parent work.
#
# @see https://github.com/samvera/valkyrie/wiki/Queries#custom-queries
# @since 3.4.0
class ParentWorkNavigator
# Define the queries that can be fulfilled by this navigator.
def self.queries
[:find_parent_work, :find_parent_work_id]
end
attr_reader :query_service
def initialize(query_service:)
@query_service = query_service
end
##
# Find parent work of a given resource, and map to Valkyrie Resources
# @note There should be only one parent resource. A warning is logged if
# more than one resource is found and the first of the resources is returned.
# @param [Valkyrie::Resource] resource
#
# @return [Array<Valkyrie::Resource>]
def find_parent_work(resource:)
results = Hyrax.query_service.find_inverse_references_by(resource: resource,
property: :member_ids).select(&:work?)
if results.count > 1
Hyrax.logger.warn("#{resource.work? ? 'Work' : 'File set'} " \
"#{resource.id} is in #{results.count} works when it " \
"should be in no more than one.")
end
results.first
end
##
# Find the id of the parent work of a given resource, and map to Valkyrie Resources IDs
# @note There should be only one parent resource. A warning is logged if
# more than one resource is found and the first of the resources is returned.
# @param [Valkyrie::Resource] resource
#
# @return [Array<Valkyrie::ID>]
def find_parent_work_id(resource:)
find_parent_work(resource: resource)&.id
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems