Add previously_force_updated?

[wata727]

This PR adds a previously_force_updated? method like ActiveModel::Dirty#*_previously_changed?.

employee = Employee.create!(name: "Jone")
employee.previously_force_updated? # => false

employee.force_update { |e| e.update!(name: "Tom") }
employee.previously_force_updated? # => true

employee.update!(name: "Kevin")
employee.previously_force_updated? # => false

employee.force_update { |e| e.destroy! }
employee.destroyed?     # => true
employee.previously_force_updated? # => true

This is the only right way to determine that history has been rewritten by force updating. Previously there was no way to determine that this was done outside of the force_update block.

side note: It was originally named force_updated? in reference to ActiveRecord::Persistence#destroyed?, but it is too similar to force_update?, so previously_force_updated? was adopted.

[krororo]

👍

[Dooor]

🚀