1 files changed, 21 insertions, 0 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 45c123d943..5bbaf0cff2 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,24 @@
+*   Rework `ActiveRecord::Relation#last` 
+    
+    1. Never perform additional SQL on loaded relation
+    2. Use SQL reverse order instead of loading relation if relation doesn't have limit
+    3. Deprecated relation loading when SQL order can not be automatically reversed
+
+        Topic.order("title").load.last(3)
+          # before: SELECT ...
+          # after: No SQL
+
+        Topic.order("title").last
+          # before: SELECT * FROM `topics`
+          # after:  SELECT * FROM `topics` ORDER BY `topics`.`title` DESC LIMIT 1
+
+        Topic.order("coalesce(author, title)").last
+          # before: SELECT * FROM `topics`
+          # after:  Deprecation Warning for irreversible order
+
+    *Bogdan Gusiev*
+
+
 *   Allow `joins` to be unscoped.
 
     Closes #13775.