Edit a Rails scaffold class to add a new field

I've generated a simple Rails 3 class using the scaffold开发者_Python百科 function:

rails generate scaffold Fattura data:date importo:integer descrizione:text

Now I need to add another field in the class Fattura. What is the best way to do that?

You can create a migration which adds a column:

rails generate migration add_my_column_to_fattura my_column:string
rake db:migrate