Fix preferred posting language returning unusable value in REST API (#18428)

1 files changed, 2 insertions, 1 deletions

diff --git a/app/models/user.rb b/app/models/user.rb
index ab832bcd0..ab2e391e9 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -53,6 +53,7 @@ class User < ApplicationRecord
   include Settings::Extend
   include UserRoles
   include Redisable
+  include LanguagesHelper
 
   # The home and list feeds will be stored in Redis for this amount
   # of time, and status fan-out to followers will include only people
@@ -248,7 +249,7 @@ class User < ApplicationRecord
   end
 
   def preferred_posting_language
-    settings.default_language || locale
+    valid_locale_cascade(settings.default_language, locale)
   end
 
   def setting_default_privacy