Update db_acts_as_versioned.rb

[yankee78]

I have the error "can't write unknown attribute type" when i try to do a revert_to, i think this might be the cause. (Rails 5)

[krozett]

I ran into the same issue. Maybe @mjsommer has abandoned this gem... :(

[mjsommer]

@yankee78 and/or @krozett , if one or both of you could contribute steps on how to repeat this, then I can take a look.

Thanks in advance!

[yankee78]

@mjsommer thanks for your answer, the issue occurs when we do a @object.revert_to(version_number) on a versioned object (ruby 2.3.1, Rails 5.0.0.1)

[krozett]

I can confirm this still happens on Ruby 2.4.0, Rails 5.0.1. In the original repo, you can see there is a check to make sure there is an STI column before trying to use it. That check doesn't exist here.

https://github.com/technoweenie/acts_as_versioned/blob/master/lib/acts_as_versioned.rb#L341

[bprice]

had the same issue with rails 4.2.7.1 and ruby 2.3.3
To reproduce:

1. create 3 versions
2. revert_to version 1 or 2