Question

我试图将twitter身份验证集成到我的Ruby on Rails应用程序中（来自Ruby on Rails教程）。

结果我删除了一个表（用户表）并且不得不重新创建它。我想现在填充数据库，我有这个代码来填充表

namespace :db do
  desc "Fill database with sample data"
  task populate: :environment do
    User.create!(name: "Example User",
                 email: "example@railstutorial.org",
                 password: "foobar",
                 password_confirmation: "foobar")
    99.times do |n|
      name  = Faker::Name.name
      email = "example-#{n+1}@railstutorial.org"
      password  = "password"
      User.create!(name: name,
                   email: email,
                   password: password,
                   password_confirmation: password)
    end
  end
end

以下命令有效：

$bundle exec rake:db migrate
$bundle exec rake:db reset

然而$ bundle exec rake：db populate不起作用。

我遇到了错误：

    $ bundle exec rake db:populate --trace
    ** Invoke db:populate (first_time)
    ** Invoke environment (first_time)
    ** Execute environment
    ** Execute db:populate
    rake aborted!
    wrong number of arguments (0 for 1)
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/devise-2.0.4/lib/devise/models/database_auth
    enticatable.rb:105:in `password_digest'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/errors.rb
    :254:in `block in add_on_blank'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/errors.rb
    :253:in `each'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/errors.rb
    :253:in `add_on_blank'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validatio
    ns/presence.rb:9:in `validate'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:310:in `_callback_before_39'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:484:in `_run__584816360__validate__204154762__callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:405:in `__run_callback'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:385:in `_run_validate_callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:81:in `run_callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validatio
    ns.rb:212:in `run_validations!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validatio
    ns/callbacks.rb:53:in `block in run_validations!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:425:in `_run__584816360__validation__204154762__callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:405:in `__run_callback'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:385:in `_run_validation_callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.0/lib/active_support/callb
    acks.rb:81:in `run_callbacks'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validatio
    ns/callbacks.rb:53:in `run_validations!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validatio
    ns.rb:179:in `valid?'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/validat
    ions.rb:69:in `valid?'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/validat
    ions.rb:77:in `perform_validations'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/validat
    ions.rb:56:in `save!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/attribu
    te_methods/dirty.rb:33:in `save!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/transac
    tions.rb:246:in `block in save!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/transac
    tions.rb:295:in `block in with_transaction_returning_status'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/connect
    ion_adapters/abstract/database_statements.rb:190:in `transaction'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/transac
    tions.rb:208:in `transaction'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/transac
    tions.rb:293:in `with_transaction_returning_status'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/transac
    tions.rb:246:in `save!'
    c:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.0/lib/active_record/validat
    ions.rb:41:in `create!'
    c:/tuffy/shopgodt/lib/tasks/sample_data.rake:4:in `block (2 levels) in <top (req
    uired)>'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:205:in `call'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:205:in `block in execute'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:200:in `each'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:200:in `execute'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:158:in `block in invoke_with_call_chain'
    c:/Ruby193/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:151:in `invoke_with_call_chain'
    c:/Ruby193/lib/ruby/1.9.1/rake/task.rb:144:in `invoke'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:116:in `invoke_task'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:94:in `block (2 levels) in top_lev
    el'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:94:in `each'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:94:in `block in top_level'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handlin
    g'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:88:in `top_level'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:66:in `block in run'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:133:in `standard_exception_handlin
    g'
    c:/Ruby193/lib/ruby/1.9.1/rake/application.rb:63:in `run'
    c:/Ruby193/bin/rake:32:in `<main>'
    Tasks: TOP => db:populate

对此事的任何帮助表示赞赏。再次感谢！

=============================================== =============

更新05/02/2012：由于我想添加第三方登录（facebook，twitter），我添加了Devise gem，但我不确定我运行的是哪个命令导致这些这两行被添加到我的app / models / User.rb文件

:token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
 devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable

一旦我评论出来，一切都运行良好。我想了解这两条线正在做什么？

Answer 1

有两个提示是什么错误

c:/tuffy/shopgodt/lib/tasks/sample_data.rake:4:in 'block (2 levels) in <top (required)>'

告诉你它在第4行，这是对create!

的调用

加上

c:/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.0/lib/active_model/validations/presence.rb:9:in 'validate'

说验证失败了。有没有验证是否存在您未提供的某些字段？检查User型号validates :some_field_name, :presence => true

Answer 2

看起来它可能是User类本身的东西。可能在验证中。

您是否在那里或任何其他自定义回调中进行了自定义验证？值得检查一下。

您可以独立于控制台中的rake任务执行User.create!，以确认是否存在问题。

Answer 3

好的 - 我遇到了同样的问题。我刚刚完成了相同的教程并且花了3小时把头发拉出来。通过Gem的代码，一切都让我意识到了什么。

这是怎么回事：

在第6章中，教程要求您将'has_secure_password'添加到您的用户模型中。从您使用Devise的任何模型中剥离此帮助程序。虽然Devise没有明确地在Gem中调用那个帮助器，但它的代码几乎模仿了'has_secure_password'的作用。

执行此操作后，请终止服务器，rails控制台等。重新开始，生活应该再次开心。

耙子中止：参数数量错误（0表示1）

3 个答案: