【发布时间】：2015-02-12 10:57:21
【问题描述】：
首先，在这里发帖有点菜鸟，所以如果我的格式关闭或类似情况，请告诉我，我很乐意修复它:)
我一直在关注 Michael Hartl 的 Rails 教程，它很棒。我确定我的问题是由于我没有正确地做某事，但我在网上找不到任何可以解决我的问题的东西。
我在第 6 章创建用户数据库。一切正常，直到我尝试做user.save
仅供参考，以下是导致问题的步骤：
rails generate model User name:string email:string
然后：
bundle exec rake db:migrate
打开一个沙盒控制台：
rails console --sandbox
创建一个新用户
user = User.new(name: "Michael Hartl", email: "mhartl@example.com")
保存：
user.save
一切都给了我预期的输出，直到 user.save 给出了这个
irb(main):002:0> user.save (0.1ms) SAVEPOINT active_record_1 (0.1ms) 回滚到保存点 active_record_1 ArgumentError：参数数量错误（1 代表 0） 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adap ters/abstract_adapter.rb:271:in
initialize' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adap ters/abstract_adapter.rb:271:innew' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adap ters/abstract_adapter.rb:271:insubstitute_at' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:97: inblock 在替代值' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96： 在each' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96: ineach_with_index' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96： 在substitute_values' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:56: ininsert' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb： 521：在_create_record' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/counter_cache.r b:139:in_create_record' 来自 /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/attribute_metho ds/dirty.rb:122:in_create_record' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:30 6:inblock in _create_record' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb： 88：在call' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb: 88:in_run_callbacks' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/callbacks.rb： 734：在_run_create_callbacks' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activerecord-4.2.0.beta4/lib/active_record/callbacks.rb:30 6:in_create_record' ... 22 级... 来自 /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/railties-4.2.0.beta4/lib/rails/commands/console.rb:9:in @987654335 @安慰' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/railties-4.2.0.beta4/lib/rails/commands/commands_tasks.rb： 39：在run_command!' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/railties-4.2.0.beta4/lib/rails/commands.rb:17:in' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies。 rb:252:inrequire' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies. rb:252:inblock in require' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies。 rb:237:inload_dependency' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies. rb:252:inrequire' 来自 /Users/Jonathon/Documents/Aptana Studio 3 Workspace/RoR/bin/rails:8:in<top (required)>' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies. rb:246:inload' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies。 rb:246:inblock in load' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies. rb:237:inload_dependency' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/activesupport-4.2.0.beta4/lib/active_support/dependencies。 rb:246:inload' from /Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:inrequire' 来自/Users/Jonathon/.rbenv/versions/2.1.3/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:inrequire' from -e:1:in'irb(main):003:0>
我已经把我的 user.rb 文件放在这里了：
class User < ActiveRecord::Base
end
还有我的 create_users.rb 文件
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.timestamps null: false
end
end
end
谢谢，如果我需要提供更多信息，请告诉我！
【问题讨论】：
-
如果你在 'bundle exec rails console' 中运行它，没有 '--sandbox' 会报错吗？
-
不，它没有。像正常一样加载控制台
-
你的步骤看起来不错；我刚刚尝试过它们，对#save 的调用运行良好。你的环境中有些东西搞砸了，但很难说是什么。你能做些什么来获得一个干净的环境吗？
-
嗯。我可以尝试获取他对 github 的提交。让我试试
-
尝试相同的步骤，但不要将沙箱选项传递给 rails 控制台。也可以试试
user = User.create(options)而不是user = User.new(options)和user.save看看会发生什么。老实说，这很奇怪。您可能需要重新启动教程并记下您遇到的任何问题/有问题的消息。
标签： ruby-on-rails railstutorial.org