How to make carrierwave delete the file when destroying a record?

问题

I'm using the carrierwave gem to upload files.

I have built a system for users to flag images as inappropriate and for admins to remove the images. From what I can tell, calling destroy on the image will only remove the path name from the table.

Is there a way to have carrierwave actually remove the file itself? Or should rails automatically remove the file when I destroy the image path?

回答1:

Not sure what CarrierWave offers for this, but you could use FileUtils in the Ruby standard library with an ActiveRecord callback.

For instance,

require 'FileUtils'
before_destroy :remove_hard_image

def remove_hard_image
  FileUtils.rm(path_to_image)
end

Sidenote: This code is from memory.

回答2:

Like @mu_is_too_short said, you can use File#delete.

Here's a code snippet you could use as a helper with a little tweaking in your rails app.

def remove_file(file)
  File.delete(file)
end

or if you just have the filename stored in file

def remove_file(file)
  File.delete("./path/to/#{file}")
end

回答3:

If one wants to delete a file but does not want to specify the full filename you can use the below.

Can also be used to delete many files or all files in a directory with a specific extension...

file = Rails.root.join("tmp", "foo*") 

or

file = Rails.root.join("tmp", ".pdf")  

---

files = Dir.glob(file) #will build an array of the full filepath & filename(s)
files.each do |f|
  File.delete(f)
end

来源：https://stackoverflow.com/questions/6553392/how-to-make-carrierwave-delete-the-file-when-destroying-a-record