There sure is a way to use the method to go from 4 all the way to 7. Just some of the fixes would be to change Rails version to 5 and 6. Author even said that i

There sure is a way to use the method to go from 4 all the way to 7. Just some of the fixes would be to change Rails version to 5 and 6. Author even said that it’s not a dogmatic thing, there is no point in interpreting it that way, just because OP does not include a couple of sentences on “you totally should upgrade to version 5 before going to 7”. It’s implied.