ruby-on-rails-3 – ActiveModel :: MassAssignmentSecurity ::错误：无法批量分配受保护的属性：

我正在关注Lynda.com的 Ruby on Rail 3 Essential Training教程.我很难创建一个Active Record Entry.这是我在控制台中遇到的错误.

1.9.3p125 :007 > user = User.new(:first_name => "Mike",:last_name => "Jones")
ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: first_name,last_name
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.3/lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.3/lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.3/lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activemodel-3.2.3/lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.3/lib/active_record/attribute_assignment.rb:75:in `assign_attributes'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.3/lib/active_record/base.rb:498:in `initialize'
    from (irb):7:in `new'
    from (irb):7
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.3/lib/rails/commands/console.rb:47:in `start'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.3/lib/rails/commands/console.rb:8:in `start'
    from /home/mark/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.3/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>`

这就是我的模型中的内容：

class User < ActiveRecord::Base
  attr_accessible :first_name,:last_name
end

我究竟做错了什么.我有轨道3.2.3

解决方法

尝试重新启动控制台.如果在启动控制台后为用户创建了模型,则应重新启动它.