Rails在迁移时预先填充表

Question

有没有办法在Rails 3.x中预先填充数据库表和迁移？我有一个状态列表,并且我希望能够在设置项目构建时预先填充它.

Answer 1

你可以用db/seeds.rb它.在新应用中填充表格的好方法.

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

Answer 2

是的.创建表后,您可以调用State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

如果你想获得更多花哨,我会使用activerecord-import gem来进行批量插入.如果要导入数百或数千条记录,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