Sivarg

If you were using clearance 0.3.X and want to upgrade to 0.4.X, the generator should help a little. Nevertheless, you should use this migration instead :

class CreateOrUpdateUsersWithClearanceColumns < ActiveRecord::Migration
  def self.up
    change_table(:users) do |t|
      t.rename :crypted_password, :encrypted_password
      t.rename :confirmed, :email_confirmed
    end
    remove_index :users, :name => "index_users_on_email_and_crypted_password"
    add_index :users, [:email, :encrypted_password], :name => "index_users_on_email_and_encrypted_password"
  end
  
  def self.down
    change_table(:users) do |t|
      t.rename :encrypted_password, :crypted_password
      t.rename :email_confirmed, :confirmed
    end
    remove_index :users, :name => "index_users_on_email_and_encrypted_password"
    add_index :users, [:email, :crypted_password], :name => "index_users_on_email_and_crypted_password"

  end
end

Be sure to rename all your login* methods to the new sign* naming convention.