清理回形针错误消息 [英] Cleaning up Paperclip error messages

问题描述

好的，所以我已经使用回形针了，我正在尝试使用内置的验证器来确保文件已上传

Okay, so i've got paperclip working, and I'm trying to use the built in validator to make sure that the file uploaded

1. 是图像


2. 不是太大

所以我在模型，根据文档：

So I have this in the model, per the documentation:

validates_attachment :avatar,
:content_type => { :content_type => /image/ },
:size => { :in => 0..2.megabytes }

然而，视图中显示的错误是这样的混乱：

However the error it shows in the view is this mess:

我希望它更简单一些，例如头像必须是小于2 MB的图像

I'd like it to be something a bit simpler, like "Avatar must be an image less than 2 megabytes"

但是，我可以看不到在哪里做，因为传递：message => '某物'引发错误未知验证器：'MessageValidator'

However, I can't see where to do this, as passing :message => 'something' throws an error Unknown validator: 'MessageValidator'

我该如何要清理吗？

请注意，上传小图像的快乐路径就很好。

Note that the happy path of uploading a small image works just fine.

进一步的测试表明，上传太大的图像（如桌面背景）或非.rb文件的图像会更正常地失败，但根本不显示任何错误消息。

Some further testing shows that uploading an image that's too big (like a desktop background) or something that's not a .rb file fails more gracefully, but doesn't display any error message at all. Still not quite what I want.

推荐答案

我最终写了两个自定义验证器。确实，这些功能与回形针验证器的功能相同，但它们的外观更美：

I ended up writing two custom validators. It's true that these do the same thing the paperclip validators do, but they fail prettier:

  def avatar_is_a_image
    if self.avatar?
      if !self.avatar.content_type.match(/image/)
        errors.add(:avatar, "Avatar must be an image")
      end
    end
  end

  def avatar_is_less_than_two_megabytes
    if self.avatar?
      if self.avatar.size > 5.megabytes
        errors.add(:avatar, "Avatar must be less than 5 megabytes in size")
      end
    end
  end

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