anchor summary error to field for nested matrix "blocks"

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Fixed a bug where element sources weren’t keyboard-selectable. ([#15876](https://github.com/craftcms/cms/issues/15876))
 - Fixed a bug where Craft wasn’t auto-detecting interactive terminals on Windows.
 - Fixed a bug where element actions were allowed on nested entries when viewing a revision. ([#15879](https://github.com/craftcms/cms/pull/15879))
+- Fixed a bug where element error summaries weren’t linking to recursively-nested Matrix fields properly. ([#15797](https://github.com/craftcms/cms/issues/15797))
 
 ## 5.4.7.1 - 2024-10-09
 

src/controllers/ElementsController.php

@@ -1059,6 +1059,17 @@ private function _errorSummary(ElementInterface $element): string
  }
  }
 
+ // If the error is for a recursively-nested Matrix field,
+ // manipulate the key to only reference the nested Matrix field, entry and inner field
+ // Before: foo[<uuid>].bar[<uuid>].baz
+ // After: bar[<uuid>].baz
+ if (substr_count($key, '.') > 1) {
+ $keyParts = explode('.', $key);
+ if (preg_match(sprintf('/\[%s\]$/', StringHelper::UUID_PATTERN), $keyParts[count($keyParts) - 3])) {
+ $key = implode('.', array_slice($keyParts, -2));
+ }
+ }
+
  $errorItem = null;
  if ($error !== null) {
  $error = Markdown::processParagraph(htmlspecialchars($error));