About seed

參考:http://rails-bestpractices.com/posts/20-isolating-seed-data

先看一段代碼...

class CreateRoles < ActiveRecord::Migration
  def self.up
    create_table :roles, :force => true do |t|
      t.string :name

      t.timestamps
    end
    ["admin", "author", "editor", "account"].each do |name|
      Role.create!(:name => name)
    end
  end

  def self.down
    drop_table :roles
  end
end

這個東東不陌生吧...所以不解析了..

現在讓我們用兩種方法來改良下吧:
(1)添加rake任務來處理:

#lib\tasks\dev.rake(這是rails2.3.4之前的做法)
namespace :dev do

  desc "Setup seed data"
  task :setup => :environment do
    ["admin", "author", "editor", "account"].each do |name|
      Role.create!(:name => name)
    end
  end
end

如果不知道上面任務是啥意思,可參考:
rake任務詳解http://fireflyman.iteye.com/blog/719362

既然上面強調了2.3.4,那下面當然是2.3.4的做法了..

#db\seed.rb
["admin", "author", "editor", "account"].each do |name|
  Role.create!(:name => name)
end

詳細參考下面:
Rails 2.3.4 发布! http://www.iteye.com/news/10161-rails-ruby
增加了新功能-->

引用

加入了db/seeds.rb作为默认文件,往数据库中保存seed信息.可以通过rake db:seed使用.

試了下...效果如下: