Rails在迁移中预填充表

Question

有没有办法在Rails 3.x中预填充数据库表中的迁移？我有一个状态列表，我希望能够在我设置项目的构建时预先填充它。

Answer 1

您可以使用db/seeds.rb这个。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

你为什么使用

Answer 2

是的。创建表后，您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 

如果你想获得更看中我会用activerecord-import宝石做批量插入。如果您有数百或数千条记录要导入，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