一、rails 2.3

相关文档:

https://guides.rubyonrails.org/v2.3/
https://guides.rubyonrails.org/v2.3/migrations.html

创建模型:

ruby script/generate model Product name:string description:text

创建独立迁移:

ruby script/generate migration AddPartNumberToProducts

运行迁移:

rake db:migrate VERSION=20080906120000

回滚:

rake db:rollback STEP=3

# db:migrate:redo任务是执行回滚然后再次迁移回来的快捷方式
rake db:migrate:redo STEP=3

特定迁移:

rake db:migrate:up VERSION=20080906120000