How to update/rename a carrierwave uploaded file?

问题:

I cant figure out how to update/rename a file uploaded/managed with Carrierwave-mongoid in rails 3.2.6. I want to rename the file in the db as well as on the filesystem.

Something like this maybe...

def rename( id , new_name )
  f = UploadedFile.find(id)

  if f.update_attributes({ f.file.original_filename: new_name })  # this is WRONG, what is right???
    new_path = File.join( File.dirname( f.file.current_path ) , new_name ))
    FileUtils.mv( f.file.current_path , new_path )
  end

  return f
end

Let me add this is after it has been uploaded already.

回答1:

I was able to get the following working, although I'm sure there is a more elegant way. I'd appreciate any comments on the following

*add this to app/uploaders/file_uploader.rb

def rename(new_name)
  sf = model.file.file
  new_path = File.join( File.dirname( sf.file ) , "#{new_name}#{File.extname( sf.file )}")
  new_sf = CarrierWave::SanitizedFile.new sf.move_to(new_path)
  model.file.cache!(new_sf)
  model.save!
  return model
end

Thanks!

回答2:

I used this rake task for reprocessing uploaded images after modifying version settings (filename and image size) in my uploader file:

# Usage: rake carrierwave:reprocess class=Model
namespace :carrierwave do
  task :reprocess => :environment do

    CLASS = ENV['class'].capitalize
    MODEL = Kernel.const_get(CLASS)
    records = MODEL.all

    records.each do |record|
      record.photo.recreate_versions! if record.photo?
    end

  end
end

Notes:

• Replace "photo" with whatever you named your uploader.
• Rake tasks go in the lib/tasks folder.
• This is using Active Record, not sure if Mongoid needs something different.

回答3:

Based on @user892583, I worked on it and came up with a simpler solution:

def rename!(new_name)
  new_path = File.join(File.dirname(file.file), new_name)
  file.move_to(new_path)
end

回答4:

I did this with this way:

  def filename
    if !cached? && file.present?
      new_filename = 'foobar'
      new_path = File.join(File.dirname(file.path), new_filename)
      file.move_to(new_path)
      recreate_versions!
      new_filename
    else
      super
    end
  end

I think this is only right way to rename file.

回答5:

The most efficient way to do this is to just move the existing S3 object (assuming your storage layer is S3):

def rename(new_name)
  bucket_name = "yourapp-#{Rails.env}"
  resource = Aws::S3::Resource.new
  bucket = resource.bucket(bucket_name)
  object = bucket.object(path)
  new_filename = "#{new_name}#{File.extname(path)}"
  new_path = File.join(File.dirname(path), new_filename)
  object.move_to(bucket: bucket_name, key: new_path)

  model.update_column(mounted_as, new_filename)
  model.reload

  # Now call `recreate_versions!(*versions.keys)`
  # if you want versions updated. Explicitly passing
  # versions will prevent the base version getting
  # reuploaded.

  model
end

This is using the aws-sdk-s3 gem.