From 79e4e778bad4755f9c9699129783e93a6bee7111 Mon Sep 17 00:00:00 2001
From: Nick Clemens <nick@bywatersolutions.com>
Date: Wed, 8 Apr 2020 09:55:20 +0000
Subject: [PATCH] Bug 24807: Add suppport for uncertain fields and ranges

To test:
1 - Have some records with uncertain dates in the 008
    19uu, 195u, etc.
2 - Index them in Elasticsearch
3 - Do a search that will return them
4 - Sort results by publication/copyright date
5 - Note odd results
6 - Apply patch
7 - Reindex
8 - Sorting should be improved
---
 Koha/SearchEngine/Elasticsearch.pm | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/Koha/SearchEngine/Elasticsearch.pm b/Koha/SearchEngine/Elasticsearch.pm
index adc5cad999..4e9e21b76b 100644
--- a/Koha/SearchEngine/Elasticsearch.pm
+++ b/Koha/SearchEngine/Elasticsearch.pm
@@ -482,7 +482,7 @@ sub _process_mappings {
         }
         if (defined $options->{filter_callbacks}) {
             # Skip mapping unless all filter callbacks return true
-            next unless all { $_->($_data) } @{$options->{filter_callbacks}};
+            next unless all { $_data = $_->($_data) } @{$options->{filter_callbacks}};
         }
         if (defined $options->{property}) {
             $_data = {
@@ -498,7 +498,11 @@ sub _process_mappings {
         }
 
         $record_document->{$target} //= [];
-        push @{$record_document->{$target}}, $_data;
+        if( ref $_data eq 'ARRAY' ){
+            push @{$record_document->{$target}}, @{$_data};
+        } else {
+            push @{$record_document->{$target}}, $_data;
+        }
     }
 }
 
@@ -893,7 +897,13 @@ sub _field_mappings {
         $default_options->{filter_callbacks} //= [];
         push @{$default_options->{filter_callbacks}}, sub {
             my ($value) = @_;
-            return $value =~ /^\d+$/;
+            my @years = ();
+            my @field_years = ( $value =~ /[0-9u]{4}/g );
+            foreach my $year (@field_years){
+                $year =~ s/[u]/0/g;
+                push @years, $year;
+            }
+            return \@years;
         };
     }
 
-- 
2.11.0