Update Changelog with new locale fallback behavior on validation

1 files changed, 24 insertions, 0 deletions

diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index a644c63992..d7586f60ed 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,27 @@
+
+*   Changed how validation error translation strings are fetched: The new behaviour
+    will first try the more specific keys, including doing locale fallback, then try
+    the less specific ones.
+    
+    For example this is the order keys will now be tried for a `blank` error on a
+    `product`'s `title` attribute with current locale set to `en-US`:
+ 
+        en-US.activerecord.errors.models.product.attributes.title.blank
+        en-US.activerecord.errors.models.product.blank
+        en-US.activerecord.errors.messages.blank
+        
+        en.activerecord.errors.models.product.attributes.title.blank
+        en.activerecord.errors.models.product.blank
+        en.activerecord.errors.messages.blank
+        
+        en-US.errors.attributes.title.blank
+        en-US.errors.messages.blank
+        
+        en.errors.attributes.title.blank
+        en.errors.messages.blank
+ 
+    *Hugo Vacher*
+
 ## Rails 6.0.0.beta2 (February 25, 2019) ##
 
 *   Fix date value when casting a multiparameter date hash to not convert