ActiveStorage::FileNotFoundError (ActiveStorage::FileNotFoundError) in server log, but not reproducable in console

Question

I have the following model:

class Section < ApplicationRecord
  has_many_attached :files
  def to_dir
    [client.to_dir, operation.to_dir, self.name.parameterize].join('/')
  end
  after_save :transload_files

  def transload_files
    TransloadService.sync( self.to_dir, self.files )
  end
end

The transload_files method is the issue. Here is the transload service:

class TransloadService

    class << self

        def sync(check_dir, files)
            # First we have to check the transload dir for files that have been deleted on the app
            transloaded_files = Request.list(check_dir)
            cull_list = transloaded_files.reject{ |e| files.map{|t| t.filename }.include? Request.filename(e)}
            if cull_list.count > 0
                Request.trim(cull_list)
                p "#{cull_list.count} files trimed from #{check_dir}."
            end

            # Next we have to upload files which arent present in the transload dir

            send_list = files.reject{ |e| transloaded_files.map{|t| Request.filename(t) }.include? e.filename.to_s }
            if send_list.count > 0
                Request.upload_to(check_dir, send_list)
                p "#{send_list.map{|r| r.filename.to_s}.join(', ')} uploaded to #{check_dir}"
            end
        end

    end

end

and here is the relevant code in request.rb

class Request
    class << self
        def upload_to(destination, files)
            files.each do |file|
                send_to = connection.object("#{destination}/#{file.filename}")
                file.open{ |tmp| send_to.upload_file(tmp) }
            end
        end
    end
end

The issue I'm facing is this: When the after_save callback runs the transload_files method it returns ActiveStorage::FileNotFoundError (ActiveStorage::FileNotFoundError)

When I run the Section.last.transload_files in the console, it performs exactly as intended. What am I missing here?

Answer 1

In my case, what I noticed is that attaching attachments with ActiveStorage is not working properly when doing it inside a transaction. This applies to migrations or callbacks.