Initialize accessors to remove some warnings in Ruby 2.0

activerecord/test/cases/migration/helper.rb

@@ -2,12 +2,10 @@
 
 module ActiveRecord
   class Migration
-    class << self
-      attr_accessor :message_count
-    end
+    class << self; attr_accessor :message_count; end
+    self.message_count = 0
 
     def puts(text="")
-      ActiveRecord::Migration.message_count ||= 0
       ActiveRecord::Migration.message_count += 1
     end
 

activerecord/test/models/reference.rb

@@ -4,9 +4,8 @@ class Reference < ActiveRecord::Base
 
   has_many :agents_posts_authors, :through => :person
 
-  class << self
-    attr_accessor :make_comments
-  end
+  class << self; attr_accessor :make_comments; end
+  self.make_comments = false
 
   before_destroy :make_comments