vendor/rails/railties/lib/rails_generator/generators/components/migration/USAGE

   1 Description:
   2     Stubs out a new database migration. Pass the migration name, either
   3     CamelCased or under_scored, and an optional list of attribute pairs as arguments.
   4
   5     A migration class is generated in db/migrate prefixed by a timestamp of the current date and time.
   6
   7     You can name your migration in either of these formats to generate add/remove
   8     column lines from supplied attributes: AddColumnsToTable or RemoveColumnsFromTable
   9
  10 Example:
  11     `./script/generate migration AddSslFlag`
  12
  13     If the current date is May 14, 2008 and the current time 09:09:12, this creates the AddSslFlag migration
  14     db/migrate/20080514090912_add_ssl_flag.rb
  15
  16     `./script/generate migration AddTitleBodyToPost title:string body:text published:boolean`
  17
  18     This will create the AddTitleBodyToPost in db/migrate/20080514090912_add_title_body_to_post.rb with
  19     this in the Up migration:
  20
  21       add_column :posts, :title, :string
  22       add_column :posts, :body, :text
  23       add_column :posts, :published, :boolean
  24
  25     And this in the Down migration:
  26
  27       remove_column :posts, :published
  28       remove_column :posts, :body
  29       remove_column :posts, :title