Errno :: ENOENT(无此类文件或目录@ rb_sysopen [英] Errno::ENOENT (No such file or directory @ rb_sysopen

问题描述

我想在文件中写一些东西.

I want to write something to a file.

# where userid is any intger [sic]
path = Rails.root + "public/system/users/#{user.id}/style/img.jpg" 
File.open(path, 'wb') do |file|
  file.puts f.read
end 

执行此代码时，出现此错误.我知道此文件夹不存在，但是如果File.open模式为w模式，则File.open会创建一个新文件(如果不存在).

When this code is executed, I'm getting this error. I know this folder doesn't exist, but File.open with w mode creates a new file if it doesn't exist.

为什么这不起作用?

推荐答案

File.open(..., 'w')如果文件不存在，则会创建一个文件.没有人保证会为其创建目录树.

File.open(..., 'w') creates a file if it does not exist. Nobody promised it will create a directory tree for it.

另一件事，应该使用 File#join 构建目录路径，而不是哑字符串连接.

Another thing, one should use File#join to build directory path, rather than dumb string concatenation.

path = File.join Rails.root, 'public', 'system', 'users', user.id.to_s, 'style'

FileUtils.mkdir_p(path) unless File.exist?(path) 
File.open(File.join(path, 'img.jpg'), 'wb') do |file|
  file.puts f.read
end

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