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# frozen_string_literal: true
module Hyrax
module SolrDocument
##
# Decorates an object responding to `#id` with an `#ordered_member_ids` method.
#
# @note this decorator is intended for use with data representations other
# than the core model objects, as an alternative to a direct query of the
# canonical database. for example, it can be used with `SolrDocument` to
# quickly retrieve member order in a way that is compatible with the
# fast access required in Blacklight's search contexts.
#
# @example
# base_document = SolrDocument.new(my_work.to_solr)
# solr_document = Hyrax::SolrDocument::OrderedMembers.decorate(base_document)
#
# solr_document.ordered_member_ids # => ['abc', '123']
#
class OrderedMembers < Draper::Decorator
delegate_all
##
# @note the purpose of this method is to provide fast access to member
# order. currently this is achieved by accessing indexed list proxies
# from Solr. however, this strategy may change in the future.
#
# @return [Enumerable<String>] ids in the order of their membership,
# only includes ids of ordered members.
def ordered_member_ids
return [] if id.blank?
@ordered_member_ids ||= query_for_ordered_ids
end
private
def query_for_ordered_ids(limit: 10_000,
proxy_field: 'proxy_in_ssi',
target_field: 'ordered_targets_ssim')
ActiveFedora::SolrService
.query("#{proxy_field}:#{id}", rows: limit, fl: target_field)
.flat_map { |x| x.fetch(target_field, nil) }
.compact
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems