Better method describing how to change ENUM in `Active Record and PostgreSQL`

Hi there,

The method describing how to change an ENUM in Active Record and PostgreSQL is a bit awkward. It put me on the wrong path for a bit. I found you can also change an enum by:

  • renaming it

  • renaming all the columns using it

  • creating a new enum

  • creating a new column using that enum

  • do some copying of values.

Advantages:

  • It runs in a transaction

  • You can add/remove/rename enum values

Here’s a gist of the helper I created to do this in my project: https://gist.github.com/StefanH/fe5f27793ed2fccc4123. Used this on pretty big production tables, no problem. Should we change it?