Rails superclass mismatch for class on migrations

Question

I am junior Ruby on Rails dev.

I have this problem: I've updated my rails from 5.1 to 6. If I try to run

rails db:migrate 

there are errors:

TypeError: superclass mismatch for class CreateVacancyFields

Looking inside my migration file:

class CreateVacancyFields < ActiveRecord::Migration[ 5.1 ]

Ok, I've changed 5.1 to 6.0 like this:

class CreateVacancyFields < ActiveRecord::Migration[ 6.0 ]

But it doesn't help. What I do wrong?

Answer 1

Possibly you're having the same named class CreateVacancyFields twice. If so, rename it to some different name to resolve this issue.