Devise migration on existing model

Question

I\'m migrating from Authlogic to Devise.

UPDATED:

The migration of devise tries to re-create the table users, so i changed as you can see below the create_

Answer 1

Instead of changing the create_table to change_table, you can just add the following line just before create_table:

rename_table :users, :old_users_authlogic

Then, right after the create_table:

say_with_time 'Migrating users from Authlogic to Devise...' do
  execute "INSERT INTO users (id, email, ...) SELECT id, email FROM old_users_authlogic"
end

If you are using indexes with referential integrity, don't forget to update them to the new table, as the rename_table will make them point to old_users_authlogic.