从轨道控制台创建记录错误

Question

我在轨道教程下面的Lynda红宝石。

下面是代码我要运行 “主题= Subject.new（：名称=> ”第一个主题“，：位置=> 1：可见=>真）”

这是我的错误信息：

ActiveModel::MassAssignmentSecurity::Error: Can't mass-assign protected attributes: name, position, visible 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activemodel-3.2.9/lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activemodel-3.2.9/lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activemodel-3.2.9/lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activemodel-3.2.9/lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/attribute_assignment.rb:75:in `assign_attributes' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/base.rb:497:in `initialize' 
    from (irb):9:in `new' 
    from (irb):9 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in `start' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in `start' 
    from /Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.9/lib/rails/commands.rb:41:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

这里是我的模型subject.rb中：

class Subject < ActiveRecord::Base 
# attr_accessible :title, :body, :name, :position, :visible 
end 

Answer 1

您需要取消注释attr_accessible，线与解释者忽略＃字符开始

class Subject < ActiveRecord::Base 
     attr_accessible :title, :body, :name, :position, :visible 
    end 

不能大规模指派保护的属性：名称，位置，可见

attr_accessible规定，可以通过大规模分配设置的属性的列表。