Trying to upgrade to Rails 4.2 I got this error all over my tests. google failed me, but after many hours of puzzling, I realised I had decimal fields in two models with no precision and scale set. In Rails 4.1, this was not a problem, but Rails 4.2 was not happy with that. Thought I would post it here in case anyone else runs into it.
on 2015-02-03 16:54