use correct operator in query based on JSON document

rails · Sep 2, 2014 · 6d988e2 · 6d988e2
1 parent a2f8377
commit 6d988e2
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/guides/source/active_record_postgresql.md b/guides/source/active_record_postgresql.md
@@ -132,7 +132,8 @@ event = Event.first
 event.payload # => {"kind"=>"user_renamed", "change"=>["jack", "john"]}
 
 ## Query based on JSON document
-Event.where("payload->'kind' = ?", "user_renamed")
+# The -> operator returns the original JSON type (which might be an object), whereas ->> returns text
+Event.where("payload->>'kind' = ?", "user_renamed")
 ```
 
 ### Range Types