From b33b1d85172c0aa2b94be73db949221c6ad200bc Mon Sep 17 00:00:00 2001
From: Stephen Hartley <steve@oppian.com>
Date: Wed, 13 Nov 2019 16:54:13 +0000
Subject: [PATCH] Added support for modifying the post authors
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For example, if you have most posts created by a single ‘automation’ author you probably don’t want every post purged when any one of them changes, so you could use:

```
add_filter('purgely_post_authors', function ($authors, $post) {
    return [];
}, 10, 2);
```
---
 src/classes/surrogate-key-collection.php | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/classes/surrogate-key-collection.php b/src/classes/surrogate-key-collection.php
index 503522a..514ed32 100644
--- a/src/classes/surrogate-key-collection.php
+++ b/src/classes/surrogate-key-collection.php
@@ -230,11 +230,15 @@ private function _add_key_terms_taxonomy()
      */
     private function _add_key_author($post)
     {
-        $author = absint($post->post_author);
+        $authors = array(absint($post->post_author));
+        $authors = apply_filters('purgely_post_authors', $authors, $post);
+
         $key = array();
 
-        if ($author > 0) {
-            $key[] = 'a-' . absint($author);
+        foreach ($authors as $author) {
+            if ($author > 0) {
+                $key[] = 'a-' . absint($author);
+            }
         }
 
         return $key;