Is it possible to retroactively add properties to DB-columns using Rails?

When you have a database populated with data, is it possible to add for instance

:default =开发者_StackOverflow> 0

to one of the columns, by using for instance a migration in Rails?

Create a new migration

# Rails 3:
rails g migration change_default_on_column_in_table

# or older Rails:
script/generate migration change_default_on_column_in_table

and use :

change_column_default(:table, :column, 0)

See the Rails documentation for more information.