'对'的ActionModel未定义的方法

问题描述

我收到以下错误：

NoMethodError in Users#new

Showing .../app/views/users/form/_new.haml where line #7 raised:

undefined method `on' for #<ActiveModel::Errors:0x007fb599ec6610>

在code在第7行是：

The code in line 7 is:

7:   = errors_for user, :first_name

而application_helper.rb：

And the application_helper.rb:

def errors_for(model, field)
  error = case errors = model.errors.on(field)
  ...
end

开是的ActiveRecord 一个默认方法。为什么没有这项工作？

'on' is a default method in ActiveRecord. Why doesn't this work?

推荐答案

如果你使用的Rails 3，那么问题是，有上方法的错误类没有了。我想，你应该使用获取了。所以：

If you're using Rails 3, then the problem is that there's no "on" method for the Errors class anymore. I think you're supposed to use "get" now. So:

error = case errors = model.errors.get(field)

或者

error = case errors = model.errors[field]

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