# frozen_string_literal: true module Hyrax # Methods in this class are from/based on ActiveFedora::SolrQueryBuilder class SolrQueryBuilderService class << self # Construct a solr query for a list of ids # This is used to get a solr response based on the list of ids in an object's RELS-EXT relationhsips # If the id_array is empty, defaults to a query of "id:NEVER_USE_THIS_ID", which will return an empty solr response # @param [Array] id_array the ids that you want included in the query def construct_query_for_ids(id_array) ids = id_array.reject(&:blank?) return "id:NEVER_USE_THIS_ID" if ids.empty? "{!terms f=#{Hyrax.config.id_field}}#{ids.join(',')}" end # Construct a solr query from a list of pairs (e.g. [field name, values]) # @param [Array] field_pairs a list of pairs of property name and values # @param [String] join_with ('AND') the value we're joining the clauses with # @param [String] type ('field') The type of query to run. Either 'raw' or 'field' # @return [String] a solr query # @example # construct_query([['library_id_ssim', '123'], ['owner_ssim', 'Fred']]) # # => "_query_:\"{!field f=library_id_ssim}123\" AND _query_:\"{!field f=owner_ssim}Fred\"" def construct_query(field_pairs, join_with = default_join_with, type = 'field') clauses = pairs_to_clauses(field_pairs, type) return "" if clauses.count.zero? return clauses.first if clauses.count == 1 "(#{clauses.join(join_with)})" end def default_join_with ' AND ' end private # @param [Array] pairs a list of (key, value) pairs. The value itself may # @param [String] type The type of query to run. Either 'raw' or 'field' # @return [Array] a list of solr clauses def pairs_to_clauses(pairs, type) pairs.flat_map do |field, value| condition_to_clauses(field, value, type) end end # @param [String] field # @param [String, Array] values # @param [String] type The type of query to run. Either 'raw' or 'field' # @return [Array] def condition_to_clauses(field, values, type) values = Array(values) values << nil if values.empty? values.map do |value| if value.present? query_clause(type, field, value) else # Check that the field is not present. In SQL: "WHERE field IS NULL" "-#{field}:[* TO *]" end end end # Create a raw query clause suitable for sending to solr as an fq element # @param [String] type The type of query to run. Either 'raw' or 'field' # @param [String] key # @param [String] value def query_clause(type, key, value) "_query_:\"{!#{type} f=#{key}}#{value.gsub('"', '\"')}\"" end end end end