ruby-on-rails - rails 3 : Generate Fake Data to Populate DB

Question

我正在使用 faker 生成样本数据。我有这个如下:

require 'faker'

namespace :db do 
  desc "Fill database with sample data" 
  task :populate => :environment do
    Rake::Task['db:reset'].invoke 
    User.create!(:name => "rails",
    :email => "example@railstutorial.org", 
    :password => "foobar", 
    :password_confirmation => "foobar")

    99.times do |n| 
      #name = Faker::Name.name
      name = "rails#{n+1}"
      email = "example-#{n+1}@railstutorial.org" 
      password = "password" 
      user = User.create!(:name => name,
      :email => email, 
      :password => password, 
      :password_confirmation => password)

    end 
  end
end

问题是我有几个 after_save 回调在创建用户时没有被调用。这是为什么？谢谢

方法:

  after_save :create_profile
def create_profile
    self.build_profile()
  end

Answer 1

在我所有的阅读中，save! 似乎绕过了任何自定义的 before_save、on_save 或 after_save 过滤器你已经定义了。 create! 的源代码显示它调用了 save!。除非你绝对需要 bang 版本，否则你为什么要使用它？尝试删除所有 bang 方法并只调用非 bang 版本:

[1..100].each do |n| 
  name = "rails#{n+1}"
  email = "example-#{n+1}@railstutorial.org" 
  password = "password" 
  user = User.new(:name => name, :email => email, :password => password, :password_confirmation => password)

  if !user.save
    puts "There was an error while making #{user.inspect}"
  end
end