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bed26c5e
2006 Aug 17
4
Migration newbie
In an migration file there is one up and one down method. Below is from
Agile Web Development with Rails:
class CreateOrderHistories < ActiveRecord::Migration
def self.up
create_table :order_histories do |t|
t.column :order_id, :integer, :null => false
t.column :created_at, :timestamp
t.column :notes, :text
end
end
def self.down
drop_table :order_histories
end
end
Why is there a drop