Ruby on rails Rails 3验证不起作用

我已经将我的应用程序从Rails 2.3.5迁移到Rails 3

我在模型中有如下验证

validates :name, :presence => {:message => "Please enter the name"}

我犯了一个错误。错误指向我添加验证的行。错误日志如下所示

activemodel (3.2.2) lib/active_model/validations/with.rb:85:in `block in validates_with'
activemodel (3.2.2) lib/active_model/validations/with.rb:83:in `each'
activemodel (3.2.2) lib/active_model/validations/with.rb:83:in `validates_with'
activemodel (3.2.2) lib/active_model/validations/validates.rb:99:in `block in validates'
activemodel (3.2.2) lib/active_model/validations/validates.rb:90:in `each'
activemodel (3.2.2) lib/active_model/validations/validates.rb:90:in `validates'
app/models/business.rb:19:in `<class:Business>'
app/models/business.rb:1:in `<top (required)>'

activemodel（3.2.2）lib/active\u model/validations/with.rb:85:in`block in validates\u with'
activemodel（3.2.2）lib/active_model/validations/with.rb:83:在'each'中
activemodel（3.2.2）lib/active\u model/validations/with.rb:83:in“validates\u with”
activemodel（3.2.2）lib/active_model/validations/validates.rb:99:in'block in validates'
activemodel（3.2.2）lib/active_model/validations/validates.rb:90:in'each'
activemodel（3.2.2）lib/active_model/validations/validates.rb:90:in'validates'
app/models/business.rb:19:in`'
app/models/business.rb:1:in`'

请帮帮我。

试试这个：

validates :name, :presence => true, :message => "Please enter the name"

validates_presence_of :name, :message => "Please enter the name"

试试这个：

validates :name, :presence => true, :message => "Please enter the name"

validates_presence_of :name, :message => "Please enter the name"

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也许这个链接对你有帮助：我试过了。但它不起作用。解决了这个问题。我在lib模块中定义了方法设置，它实际上存在于validations模块中。我尝试了validates:name，:presence=>{:message=>“选择至少一个选项”}，但它不起作用。