回形针：发现以下错误：图像的内容与报告的内容不符

Question

我在 rails 应用程序中使用回形针，但我总是收到以下错误：

I, [2015-06-06T20:10:25.310071 #37358]  INFO -- : Command :: file -b --mime '/tmp/58e53d1324eef6265fdb97b08ed9aadf20150606-37358-ouvtzl.png'
I, [2015-06-06T20:10:25.317478 #37358]  INFO -- : [paperclip] Content Type Spoof: Filename ruby.png (application/octet-stream from Headers, [#<MIME::Type:0x000000053624c8 @friendly={"en"=>"Portable Network Graphics (PNG)"}, @system=nil, @obsolete=false, @registered=true, @use_instead=nil, @signature=false, @content_type="image/png", @raw_media_type="image", @raw_sub_type="png", @simplified="image/png", @i18n_key="image.png", @media_type="image", @sub_type="png", @docs=[], @encoding="base64", @extensions=["png"], @references=["IANA", "[Glenn_Randers-Pehrson]", "{image/png=http://www.iana.org/assignments/media-types/image/png}"], @xrefs={"person"=>["Glenn_Randers-Pehrson"], "template"=>["image/png"]}>] from Extension), content type discovered from file command: image/png. See documentation to allow this combination.
I, [2015-06-06T20:10:25.349416 #37358]  INFO -- : Command :: file -b --mime '/tmp/58e53d1324eef6265fdb97b08ed9aadf20150606-37358-1n574dp.png'
I, [2015-06-06T20:10:25.356667 #37358]  INFO -- : [paperclip] Content Type Spoof: Filename ruby.png (application/octet-stream from Headers, [#<MIME::Type:0x000000053624c8 @friendly={"en"=>"Portable Network Graphics (PNG)"}, @system=nil, @obsolete=false, @registered=true, @use_instead=nil, @signature=false, @content_type="image/png", @raw_media_type="image", @raw_sub_type="png", @simplified="image/png", @i18n_key="image.png", @media_type="image", @sub_type="png", @docs=[], @encoding="base64", @extensions=["png"], @references=["IANA", "[Glenn_Randers-Pehrson]", "{image/png=http://www.iana.org/assignments/media-types/image/png}"], @xrefs={"person"=>["Glenn_Randers-Pehrson"], "template"=>["image/png"]}>] from Extension), content type discovered from file command: image/png. See documentation to allow this combination.

Mongoid::Errors::Validations (
Problem:
  Validation of Mock failed.
Summary:
  The following errors were found: Image has contents that are not what they are reported to be
Resolution:
  Try persisting the document with valid data or remove the validations.):
  app/api/mockaccino/api.rb:23:in `block (2 levels) in <class:API>'

用于测试的 curl 命令：

curl -X POST -i -F image=@/home/user/workspace/ruby.png -F name=mock http://localhost:3000/api/mock

我正在尝试向服务器发送一个图像和一个名为 "name" 的参数，并使用此属性和图像创建一个模型。

型号：

class Mock
  include Mongoid::Document
  include Mongoid::Paperclip

  field :name, type: String

  has_mongoid_attached_file :image

  validates_attachment_presence :image
  validates_attachment_size :image, :less_than => 1.megabytes
  validates_attachment_file_name :image, :matches => [/png\Z/, /jpe?g\Z/]
end

控制器（葡萄）：

desc "Create an mock."
      params do
        requires :name, type: String, desc: "Mock name"
        requires :image, :type => Rack::Multipart::UploadedFile, :desc => "Image file."
      end 
      post do
        mock = Mock.create!(
          name: params[:name],
          image: ActionDispatch::Http::UploadedFile.new(params[:image])
        )
      end

Answer 1

curl -i -X POST -H "Content-Type:multipart/form-data" -F image=@\"./ruby.png\";type=image/png;filename=\"ruby.png\"" http://localhost:3000/api/mock

Answer 2

我有一个用户正在使用各种浏览器查看它。我无法在本地开发服务器或生产服务器上复制它。它对我有用，对他们不起作用。无法隔离任何不同之处（尝试过 PC 与 Mac、各种浏览器等）

将回形针从 4.3 推回到 4.2.1 可以解决问题。这会将 activemodel 和 activesupport 从 3.2 切换回 3.0，并消除了对 mimemagic 的依赖。我的猜测是它是 mimemagic 中微妙而复杂的东西。

回形针：发现以下错误：图像的内容与报告的内容不符

Paperclip: The following errors were found: Image has contents that are not what they are reported to be

ruby-on-rails

ruby-grape

paperclip