Fix syntax error in the doc [ci skip]

1 files changed, 1 insertions, 1 deletions

diff --git a/guides/source/active_record_querying.md b/guides/source/active_record_querying.md
index b68b4baecf..f5a37214de 100644
--- a/guides/source/active_record_querying.md
+++ b/guides/source/active_record_querying.md
@@ -1281,7 +1281,7 @@ This is almost the same as defining a class method, except for that scopes alway
 
 ```ruby
 class Article < ApplicationRecord
-  scope :by_user, ()-> { where(user: user) if user }
+  scope :by_user, ->(user) { where(user: user) if user }
   def self.published_since(date)
     where('published_at > ?', date) if date
   end