Rails: From UUID to ID

Question

I\'ve created a model Order with UUID as the primary key. Now, I\'d like to change it back to a normal incremental integer.

I\'ve tried to run a migration

Answer 1

Does the table have data?

If no, just drop old id column and add new:

remove_column :orders, :id
add_column :orders, :id, :primary_key

If yes, rename id column to id_deprecated

rename_column :orders, :id, :id_deprecated
add_column :orders, :id, :primary_key

and add your logic to handle references of old_id in other tables.