Gem Paperclip::Errors::NotIdentifiedByImageMagickError

Question

我试着用回形针上传.pdf和.doc。

Command :: file -b --mime '/var/folders/86/5tdcyh5171j6twqqkt49tq040000gn/T/d031fe0d3003c25aa6a9d1525403031a20140707-7537-6y9s83.pdf'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/86/5tdcyh5171j6twqqkt49tq040000gn/T/d031fe0d3003c25aa6a9d1525403031a20140707-7537-1ru9fns.pdf[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/86/5tdcyh5171j6twqqkt49tq040000gn/T/d031fe0d3003c25aa6a9d1525403031a20140707-7537-1ru9fns.pdf[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
   (0.2ms)  begin transaction
Command :: file -b --mime '/var/folders/86/5tdcyh5171j6twqqkt49tq040000gn/T/d031fe0d3003c25aa6a9d1525403031a20140707-7537-1b7261f.pdf'
   (0.2ms)  rollback transaction

Answer 1

调整图像大小，即:styles => { :medium => "300x300>", :thumb => "345x215#" }需要影象。安装imagemagick应该可以解决这个问题。

has_attached_file :media,
    :styles => {
      :medium => "300x300>",
      :thumb => "345x215#",
      :pdf_thumbnail => ["", :jpg]
    },
    :default_url => ActionController::Base.helpers.asset_path('branch-default.jpg')

validates :media, :attachment_content_type => { :content_type => ['image/png', 'image/jpg', 'application/pdf', 'application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document']}

此外，指定用于pdf上载的pdf_thumbnail将生成缩略图，尽管我认为此功能需要GhostScript:以下是剪贴画github页面的摘录：

如果您正在处理pdf上载或运行测试套件，您还需要安装GhostScript。

其他内容类型缩略图的另一个有用链接：

用剪纸夹定制文件类型的缩略图