The slides from a very short presentation I did at the Melbourne Ruby User Group's Nuby Night.

1. Migrations

2. Why Migrations?

3. Agility

4. Agility
Incrementally improve
your schema

5. $ script/generate migration create_bids

6. $ script/generate migration create_bids
$RAILS_ROOT/db/migrate/001_create_bids.rb

9. $ rake db:migrate

10. $ rake db:migrate
$ rake db:migrate VERSION=0

11. Transformations
create_table(name, options)
drop_table(name)
add_column(table_name, column_name, type, options)
remove_column(table_name, column_name)

12. More...
rename_table(old_name, new_name)
rename_column(table_name, column_name, new_column_name)
change_column(table_name, column_name, type, options)

13. And then some.
add_index(table_name, column_names, index_type, index_name)
remove_index(table_name, index_name)

14. I'm Abhi from Cogent Consulting.
Thank You.

15. $RAILS_ROOT/db/migrate/001_create_bids.rb
$ rake db:migrate VERSION=N