default_scope will interrupt the update_attributes on the AR outside the default_scope, below solution will work.

with_exclusive_scope.rb

#default_scope will interrupt the update_attributes on the AR outside the default_scope, below solution will work.

#with_exclusive_scope is protected, so you have to create a class method:

def self.include_deleted_in
  Post.with_exclusive_scope { yield }
end

#then in your controller call

Post.include_deleted_in {Post.find(:all)}