Rails:如何获得基于MIME类型的文件扩展名/后缀 [英] Rails: how to get a file extension/postfix based on the mime type

问题描述

我的问题是，Ruby on Rails是否具有类似于以下功能:

Question I have is, does Ruby on Rails have a function similar to:

file_content_type = MIME::Types.type_for(file).first.content_type

将为特定的mime类型返回文件扩展名或后缀吗?因此，如果我输入"image/jpeg"，该函数将返回"jpg"

that will return the file extension or postfix for a specific mime type? So if I pass in 'image/jpeg' the function will return 'jpg'

寻找一种更简洁的编码方式，而不必编写执行相同工作的case语句.

Looking for a cleaner way to code than having to write a case statement that does the same job.

推荐答案

Rack::Mime 具有此功能能力(机架是Rails的依赖项):

Rack::Mime has this ability (and Rack is a dependency of Rails):

require 'rack/mime'
Rack::Mime::MIME_TYPES.invert['image/jpeg']  #=> ".jpg"

如果您要经常进行查找，您可能希望记住倒置的哈希，因为这不是一项便宜的操作.

You may wish to memoize the inverted hash if you’re going to do the lookup often, as it’s not an inexpensive operation.

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