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好的，伙计们，我有一个问题 - 因为我创建了一个模型和表 AdminUser，然后我尝试向它添加值，然后控制台打印我......有什么想法吗？

1.9.3-p286 :020 > AdminUser
 => AdminUser(id: integer, first_name: string, last_name: string, email: string, pass: string, date_reg: datetime, update: datetime) 

1.9.3-p286 :021 > AdminUser.all
  AdminUser Load (0.2ms)  SELECT "admin_user".* FROM "admin_user" 
 => [] 

1.9.3-p286 :022 > me =  AdminUser
 => AdminUser(id: integer, first_name: string, last_name: string, email: string, pass: string, date_reg: datetime, update: datetime) 
1.9.3-p286 :023 > me.new
ActiveRecord::DangerousAttributeError: update is defined by ActiveRecord
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.8/lib/active_record/attribute_methods.rb:91:in `instance_method_already_implemented?'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:263:in `block in define_attribute_method'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:260:in `each'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:260:in `define_attribute_method'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:256:in `block in define_attribute_methods'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:256:in `each'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:256:in `define_attribute_methods'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.8/lib/active_record/attribute_methods.rb:66:in `block in define_attribute_methods'
    from <internal:prelude>:10:in `synchronize'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.8/lib/active_record/attribute_methods.rb:63:in `define_attribute_methods'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.8/lib/active_record/attribute_methods.rb:168:in `respond_to?'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:398:in `__run_callback'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in `_run_initialize_callbacks'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/activerecord-3.2.8/lib/active_record/base.rb:501:in `initialize'
    from (irb):23:in `new'
    from (irb):23
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start'
    from /home/wojtek/.rvm/gems/ruby-1.9.3-p286/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'1.9.3-p286 :024 >
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1 回答 1

3

您的问题是这update是模型中的一列。但是update也是Active Record定义的一种方法。因此，如果您尝试访问，rails 将不知道您在谈论哪个admin.update。如果您将update列重命名为其他名称，您应该没问题。

您可能想查看时间戳。http://guides.rubyonrails.org/migrations.html#special-helpers它在我看来就像你想对update专栏做的事情。

于 2012-11-14T18:28:55.843 回答