[Fire-Dragon-DoL]

I dodged that, started getting serious with rails 3 and ruby 1.9+

No,there are still many undocumented breaking changes. I recently upgraded an old app from Rail 4 to 7 that used minimal non-rails stuff and was shocked by the corner cases.

Manu changes to activerecord api go completely undocumented, but they break the code nonetheless

[brightball]

Did you go straight from 4 to 7 or 4, 5, 6, 7?

[Fire-Dragon-DoL]

There is no upgrade guide from 4 to 7,so I did from 4.2 to 5,from 5 to 5.1, from 6 to 6.1 and then to 7.

I actually found a bug that broke my app at version 6 that was resolved in 6.1,so technically my tests were not passing in version 6 and I did an "unsafe upgrade" to version 6.1