FrozenError when calling .new on STI model with state_machine in Rails 6.1 #363
Description
Calling .new on an ActiveRecord Single Table Inheritance model with a state_machine defined results in a "FrozenError: can't modify frozen Hash" since Rails 6.1.
Example, suppose we have the following model:
class Car < ApplicationRecord
state_machine do
end
end
which has a state and type column (the latter enabling STI) and some subclasses extending from Car. We would expect Car.new to return a new Car instance, but instead it crashes with "FrozenError: can't modify frozen Hash:".
Rails version: 6.1.4.1
Ruby version: 2.7.3
State machine version: 1.2.0
This did work in Rails 6.0 and before.