Changes to mass_assignment_authorizer cause errors in Ruby on Rails 3.1

Question

Protecting against mass assignment as in this railscast no longer works in Rails 3.1.

Error given is:

wrong number of arguments (1 for 0)

for

app/models/user.rb:20:in `mass_assignment_authorizer'

Answer 1

If you're trying to implement the override technique in Ryan's Railcasts, but using Rails 3.1.0, then re-writing the private def in the model to:

def mass_assignment_authorizer(role = :default)
 super + (accessible || [])
end

I found this cleared the

wrong number of arguments (1 for 0)

error above (ie just adding (role = :default), and also correlates with the answer above