From 26c8e1fedf1ea45ff0c8ceb6e4856f060d206ed6 Mon Sep 17 00:00:00 2001
From: Matthew Wire <mjw@mjwconsult.co.uk>
Date: Thu, 3 Mar 2022 20:59:46 +0000
Subject: [PATCH] Allow API4 match to match an empty value

---
 Civi/Api4/Generic/AbstractSaveAction.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Civi/Api4/Generic/AbstractSaveAction.php b/Civi/Api4/Generic/AbstractSaveAction.php
index 50aa311c46..94b932efd3 100644
--- a/Civi/Api4/Generic/AbstractSaveAction.php
+++ b/Civi/Api4/Generic/AbstractSaveAction.php
@@ -142,7 +142,13 @@ abstract class AbstractSaveAction extends AbstractAction {
       $where = [];
       foreach ($record as $key => $val) {
         if (isset($val) && in_array($key, $this->match, TRUE)) {
-          $where[] = [$key, '=', $val];
+          if ($val === '' || is_null($val)) {
+            // If we want to match empty string we have to match on NULL/''
+            $where[] = [$key, 'IS EMPTY'];
+          }
+          else {
+            $where[] = [$key, '=', $val];
+          }
         }
       }
       if (count($where) === count($this->match)) {
-- 
2.25.1