如何测试该验证失败的ActiveRecord的？ [英] How to test which validation failed in ActiveRecord?

问题描述

我有这样一个模型：

class User < ActiveRecord::Base
  validates_length_of :name, :in => (2..5)
end

我想测试这个验证：

I want to test this validation:

it "should not allow too short name" do
  u = User.new(:name => "a")
  u.valid?
  u.should have(1).error_on(:name)
end

但后来它不检查哪些类型的错误被设置了名称。我想知道，如果它是 too_short ， too_long ，或者一些其他的验证失败。

But then it does not test which kind of error was set on name. I want to know, if it was too_short, too_long, or maybe some other validation failed.

我可以查找中的错误数组消息文本中，像这样的：

I can lookup the message text in errors array, like this:

u.errors[:name].should include(I18n.t("activerecord.errors.models.user.attributes.name.too_short"))

但是，当我在语言环境文件，而不是特定型号的消息集 activerecord.errors.messages.too_short 这将失败。

那么，是不是可以检查哪些类型的错误发生？

So, is it possible to check which kind of error occured?

推荐答案

我真的不喜欢寻找错误散列翻译的错误消息的想法。有一个老乡Ruby专家交谈后，我最终猴子补丁错误哈希，所以它首先节省了非翻译的消息。

I really don't like the idea of looking for translated error messages in Errors hash. After a conversation with a fellow Rubyists, I ended monkey patching Errors hash, so it saves the non-translated message first.

module ActiveModel
  class Errors
    def error_names
      @_error_names ||= { }
    end

    def add_with_save_names(attribute, message = nil, options = {})
      message ||= :invalid
      if message.is_a?(Proc)
        message = message.call
      end
      error_names[attribute] ||= []
      error_names[attribute] << message
      add_without_save_names(attribute, message, options)
    end

    alias_method_chain :add, :save_names
  end
end

然后你可以测试这样的：

Then you can test like this:

u = User.new(:name => "a")
u.valid?
u.errors.error_names[:name].should include(:too_short)

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