Carrierwave-如果文件类型不在白名单中，则会触发状态验证 [英] Carrierwave - Presence validation triggering if filetype not on whitelist

问题描述

在我的Rails 4应用程序中，我正在使用载波上传图像.

In my rails 4 app I am using carrierwave to upload images.

class UserItemImage < ActiveRecord::Base

  include PicturesHelper

  attr_accessor :foo

  mount_uploader :picture, PictureUploader
  belongs_to :user_item
  validate :picture_size
  validates :picture, presence: true

end

我正在 picture_uploader.rb

  def extension_white_list
    %w(jpg jpeg png)
  end

我的表格

  <%= simple_form_for :user_item_image, url: user_item_user_item_images_path(@user_item), multipart: true do |f| %>
    <%= f.input :picture, as: :file, label: false, input_html: {multiple: true, class: 'image-file'} %>

当我尝试附加扩展名不在白名单中的文件时.我收到不能为空"的错误消息.如果我删除在线状态验证，则white_list验证错误将正确显示.我确实希望显示文件扩展名错误消息，因为从技术上讲它不是空白的，只是文件不正确.

When I try attaching a file with an extension not on the whitelist. I am getting a "can't be blank" error message. If I remove the presence validation, then the white_list validation error displays correctly. I really want the file extension error message to show up instead, because technically it's not blank it just has an incorrect file.

推荐答案

我遇到了同样的问题，最终还是这样做了:

I have the same problem and ended up doing this:

1)确保在验证之前放置 mount_uploader:attachment，AttachmentUploader .

1) Make sure to put mount_uploader :attachment, AttachmentUploader before validations.

2)

validates :attachment, presence: true, unless: :attachment_errors_exist?

def attachment_errors_exist?
  errors[:attachment].present?
end

我发现是否存在其他错误(很可能是 extension_white_list_error )，那么附件必须已经存在，对吗?我想您可以进一步检查消息本身以确定它是否为 extension_white_list_error ，但这对我来说已经足够了.

I figured if other errors exist (most likely it's extension_white_list_error), then the attachment must be present already, right? I guess you can further examine the message itself to determine whether it is extension_white_list_error, but this is good enough for me.

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