Home-brewed file upload in Ruby on Rails (See related posts)

I tried your code last night and couldn't get it to work, I found that the write_attribute was not working correctly on the database. commented those two lines out in file=(uploaded_file) method and also in the def after_create methods.

I put the new lines in the def file=(uploaded_file) method, and here they are...

    self.content_type = @uploaded_file.content_type
    self.file = path_to_file

I am a newb to both Ruby and Rails, but I personally was unable to get Dir.mkdir to work in the example.

FileUtils.mkdir_p() seemed far more effective, as it can create complete paths (directory and any necessary parent directories):

Options: mode noop verbose

Creates a directory and all its parent directories. For example,
FileUtils.mkdir_p '/usr/local/lib/ruby'
causes to make following directories, if it does not exist.
* /usr
* /usr/local
* /usr/local/lib
* /usr/local/lib/ruby
You can pass several directories at a time in a list.

So basically I replaced the two appearances of Dir.mkdir() with FileUtils.mkdir_p() and it worked perfectly.

I am using this code in 1.1.2, had to make a few changes:

class SingleFile < ActiveRecord::Base
  def file=(uploaded_file)  
    @uploaded_file = uploaded_file
    @filename = sanitize_filename(@uploaded_file.original_filename)
    write_attribute(:content_type, @uploaded_file.content_type)
  end

  def after_create
    if !File.exists?(File.dirname(self.path))
      FileUtils.mkdir_p(File.dirname(self.path))
    end
    if @uploaded_file.instance_of?(Tempfile)
      FileUtils.copy(@uploaded_file.local_path, self.path)
    else
      File.open(self.path, "wb") { |f| f.write(@uploaded_file.read) }
    end
    write_attribute(:file, self.simple_path)
    self.save
  end

  def after_destroy
    if File.exists?(self.file)
      File.delete(self.file)
      Dir.rmdir(File.dirname(self.file))
    end
  end

  def simple_path
    "#{self.id}/#{@filename}"
  end

  def path
    File.expand_path("#{RAILS_ROOT}/public/files/#{self.id}/#{@filename}")
  end

private
  def sanitize_filename(file_name)
    # get only the filename, not the whole path (from IE)
    just_filename = File.basename(file_name) 
    # replace all none alphanumeric, underscore or perioids with underscore
    just_filename.gsub(/[^\w\.\_]/,'_') 
  end
end

This code is so old... better to use attachment_fu!

hello,
i am developping a web rails application and the difficuty is to upload file in a parametre path and also i must save other information in Upload_FILE table
i want to create a function
upload_file(file,path) that save file in path
can you help me