Carrierwave如何获得文件扩展名

问题描述

我正在开发一个需要文件上传/下载的Ruby on Rails应用程序。对于上传部分，我使用了宝石载波，因为它非常易于使用和灵活。问题是：一旦我上传文件，我需要知道一些事情：即如果它是一个PDF而不是下载文件我显示它内联，同样的图像。如何获取文件扩展名，以及如何将发送文件发送给用户？确定文件的扩展名（我想挂载上传者的名字是'file'）：

/ p>

  file = my_model.file.url 
扩展名= my_model.file.file.extension.downcase 
  

然后准备mime和处置变量：

  disposition ='attachment'
 mime = MIME :: Types.type_for（file）.first.content_type 
 
 if％w {jpg png jpg gif bmp} .include？ （extension）or extension ==pdf
 disposition ='inline'
 end 
  

然后发送文件：

  send_file档案，：type => mime，：处置=>处置
  

I'm developing a Ruby on Rails application that requires file uploading/downloading. For the upload part i used the gem carrierwave since it's very easy to use and flexible. The problem is: once i uploaded the file, i need to know a few things: i.e. if it's a pdf instead of downloading the file i show it inline,and the same goes for an image. How do i get the file extension and how can i do it to send the file to a user?? Any feedback is appreciated Thanks!!

解决方案

Determine file extension (I suppose a name for mounted uploader is 'file'):

file = my_model.file.url
extension = my_model.file.file.extension.downcase

Then prepare mime and disposition vars:

disposition = 'attachment'
mime = MIME::Types.type_for(file).first.content_type

if %w{jpg png jpg gif bmp}.include?(extension) or extension == "pdf"
  disposition = 'inline'
end

(add other extensions if you want).

And then send the file:

send_file file, :type => mime, :disposition => disposition

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