http://guides.rubyonrails.org/migrations.html
- add_column
- add_index
- change_column
- change_table
- create_table
- drop_table
| ActiveRecord cheat sheet / EXAMPLES | |
| INSTALL | |
| ======= | |
| $ gem install activerecord | |
| in GEMFILE: gem ‘activerecord’ | |
| REQUIRE | |
| ======= | |
| require ‘active_record’ | 
http://guides.rubyonrails.org/migrations.html