rake db:migrate StandardError macOS

Question

I'm getting a so called 'StandardError' when I run rake db:migrate. I ran this command:

rake db:migrate 

And got this 'StandardError' in a Mac Terminal

Answer 1

Go through all your migration files in db/migrate and change this line:

class XYZ < ActiveRecord::Migration

to look like this instead:

class XYZ < ActiveRecord::Migration[5.0]

---

I'm assuming you're working with an old / poorly maintained app. If you're generating migrations yourself and they're not automatically including [5.0] at the end, then you should probably open a second question to figure that part out.