Adding a new value to an existing ENUM Type

Question

I have a table column that uses an enum type. I wish to update that enum type to have an additional possible value. I don\'t want to delete any exi

Answer 1

If you are using Postgres 12 you can just run ALTER TYPE ... ADD VALUE inside of transaction (documentation).

If ALTER TYPE ... ADD VALUE (the form that adds a new value to an enum type) is executed inside a transaction block, the new value cannot be used until after the transaction has been committed.

So no hacks needed in migrations.

UPD: here is an example (thanks to Nick for it)

ALTER TYPE enum_type ADD VALUE 'new_value';