two tables in one migration file?

i already have 10_create_comments migration file.
that file contains
create_table :comments do |t|
      t.column :title, :text
      t.column :foto_id, :integer
      t.column :user_id, :integer
      t.column :created_at, :datetime
      t.column :updated_at, :datetime

this is design for photo commenting purpose. i i need another comment
setup under the message so how do i use this migration file to that?
any ideas?


Your current create_table should appear in the self.up section of the
migration... self.down should undo any operation that self.up performs
(where reasonable).

There's nothing stopping you from adding another create_table statement
as long as its properly formatted.

You'll probably hear all sorts of opinions about mixing more than one
action in a single migration step. If you do create more than one
table, realize that the migration becomes an all or nothing choice, both
tables or neither.

You can code it however you want of course, but what is so bad about
adding another migration for the message comments?

between comments and several (at least two) other models in your
application. Check out has_many_polymorphs, and simplify your