Merge pull request rails#20973 from vngrs/fix_rails_tests

fix rails tests

Author: rafaelfranca

activerecord/test/models/topic.rb

@@ -32,7 +32,7 @@ def two
     end
   end
 
-  has_many :replies, :dependent => :destroy, :foreign_key => "parent_id"
+  has_many :replies, dependent: :destroy, foreign_key: "parent_id", autosave: true
   has_many :approved_replies, -> { approved }, class_name: 'Reply', foreign_key: "parent_id", counter_cache: 'replies_count'
 
   has_many :unique_replies, :dependent => :destroy, :foreign_key => "parent_id"