迁移中的Rails预填充表

你可以用 db/seeds.rb 为了这个。在新应用程序中填充表的好方法。

http://ryandaigle.com/articles/2009/5/13/what-s-new-in-edge-rails-database-seeding

http://www.robbyonrails.com/articles/2009/09/05/planting-the-seeds

是的。创建表后,可以调用状态模型并开始填充表。

class LoadStates < ActiveRecord::Migration
  def self.up
    states = ['state1','state2','state2']
    for state in states
        State.create(:name=>state)
    end
  end

  def self.down
    State.delete_all
  end
end

如果你想变得更花哨我会用 activerecord-import 宝石做批量插入。如果要导入成百上千条记录,这也是一种很好的方法。

  def self.up
    states = ['state1','state2','state2']
    states_for_import = []
    for state in states
        states_for_import << State.new(:name=>state)
    end
    State.import states_for_import
  end