assigning state_event overrides the state no matter what in Rails 4.2

[jcohenho]

This might be a related issue: pluginaweek/state_machine#327
Here I have a Car class:

class Car < ActiveRecord::Base
  attr_accessible :state_event

  state_machine :state, initial: :parked do
    event :drive do
      transition :parked => :driving
    end
    event :stop do
      transition :driving => :parked
    end
    event :turn_right do
      transition :driving => :moving_right 
    end
  end

end

c = Car.create!
c.update_attributes({ state_event: :turn_right })

The last command will successfully save the car and update the state attribute to :turn_right, even though it should fail and return false, since a car cannot move from it's initial :parked state to :moving_right.
If I run:

c.state = :moving_right
c.save!

I will get the false value properly returned.

[jcohenho]

closed because Rails 4 upgrade fail. I had to add attr_accessible to :state_event.