RailsCasts Pro episodes are now free!

Learn more or hide this

Migrations in Rails 2.1

#107 Migrations in Rails 2.1

May 16, 2008 | 4 minutes | Rails 2.1
Migrations now have a timestamp as their version number in Rails 2.1. In this episode I will explain this change as well as show you some other cool additions.
Click to Play Video ▶
  • Download:
  • mp4Full Size H.264 Video (5 MB)
  • m4vSmaller H.264 Video (3.74 MB)
  • webmFull Size VP8 Video (10.8 MB)
  • ogvFull Size Theora Video (6.58 MB)
in a migration file 
def self.up
  change_table :products do |t|
    t.rename :released_on, :released_at
    t.change :description, :text, :limit => nil, :null => true
    t.remove :price
    t.integer :stock_quantity
  end
end

def self.down
  change_table :products do |t|
    t.rename :released_at, :released_on
    t.change :description, :string, :null => false
    t.decimal :price, :precision => 10, :scale => 2
    t.remove :stock_quantity
  end
end