Question

This is my code to obtain an UUID:

  def manage_id
    self.id = UUIDTools::UUID.random_create().to_s.upcase if self.id.blank?
  end

This works perfectly for the primary key of my object.

My problem is I want to name an uploaded file with an UUID… and I obtain the same UUID for different uploads. For example I will have an UUID and 2 minutes later with another object I will have the same UUID !

This is the class code to name my image:

:filename => "#{UUIDTools::UUID.random_create().to_s.upcase}.jpg" }

I don’t understand what can be the problem when generating the UUID…

I have not the problem in development !!!

EDIT 1: the problem is not with UUID itself, it’s the same with a timestamp… (and only in production)

EDIT 2: I found the problem. The setting:

config.cache_classes = true

is the problem in production mode. It is certainly keeping the UUID somewhere in memory.

I think I can’t switch to false in production mode (for performance), so what is the best way to deactivate the cache for this plugin name feature ?

EDIT 3: I add the full code of my model

class Product < ActiveRecord::Base

 file_column :image, {:magick => { :versions => { "tiny" => "70x70", "small" => "160x240", "high" => "640x960" }}, :store_dir => "public/upload/wine/image", :web_root => "upload/", :filename => "#{UUIDTools::UUID.timestamp_create().to_s.upcase}.jpg" }

end

So, as I said the UUID generated is cached in production. I don’t know how to force this model or maybe the plugin file_column to not be cached ?

Answer 1

The reason that it doesn’t work for you because you always use pre-initialized option.
But you can try to change something to improve it. For example you can use lambda expression for calcaulationg filename … Try something like next

file_column :image, {:magick => 
                            { :versions => 
                                { "tiny" => "70x70", "small" => "160x240", "high" => "640x960" }
                             },
                             :store_dir => "public/upload/wine/image", 
                             :web_root => "upload/", 
                             :filename => lambda { "#{UUIDTools::UUID.timestamp_create().to_s.upcase}.jpg"} }

and change this

Assign filename to temp image path. Update code @class TempUploadedFile store_upload method line number 219

@filename = options[:filename] || FileColumn::sanitize_filename(file.original_filename)

to

options_file_name = options[:filename].respond_to?(:call) ? options[:filename].call : options[:filename]


   @filename = options_file_name || FileColumn::sanitize_filename(file.original_filename)