Question

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

Answer 1

您可以使用db/seeds.rb。在新应用程序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

如果你想获得更多的幻想，我会使用activerecord-import gem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

Rails在迁移时预先填充表

2 个答案: