Rails - Jan 2009 - generate a migration (from a plugin) to add a column with a default value to an existing table

I add a column to an existing table via the generator with the
following action:

  def cmi_local_assigns
    returning(assigns = {}) do
      assigns[:migration_action] = "add"
      assigns[:class_name] = "cmi_add_avatar_to_user#{class_name}"
      assigns[:table_name] = args[1]
      assigns[:attributes] = [Rails::Generator::GeneratedAttribute.new
("user_avatar", "string")]
    end
  end

This works fine, bug now I want to add a default value for the newly
created column.
How is this possible?
The Rails::Generator::GeneratedAttribute.new allows just two
parameters.

Any ideas?
Thanks,
Bernd

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