Merge pull request rails#13276 from aayushkhandelwal11/change_to_key

removing multiple check conditions to single check condition

Author: rafaelfranca

activemodel/lib/active_model/conversion.rb

@@ -49,8 +49,7 @@ def to_model
     #   person = Person.create
     #   person.to_key # => [1]
     def to_key
-      key = respond_to?(:id) && id
-      key ? [key] : nil
+      [id] if respond_to?(:id) && id
     end
 
     # Returns a +string+ representing the object's key suitable for use in URLs,