Rails - Oct 2013 - Is it possible to include the username in an attachment file_name? Using Paperclip, Rails 3., Devise

Hello, I''m new to Ruby, Rails, Devise and Paperclip and I''m
trying to
change a filename when I upload it to include the user''s nickname after
a _
however, I keep getting filename.extension_(*missing user name*) and this 
error

    undefined method `current_user='' for #<UploadFiles:0x467ea88>
app/controllers/upload_files_controller.rb:31:in `create''

My code:

Model:

class UploadFiles < ActiveRecord::Base
  before_create :change_file_name_inventory
  before_create :change_file_name_material_list
  attr_accessible :inventory, :material_list, :current_user
  has_one :inventory
  has_one :material_list
  has_attached_file :inventory, :url=>"/tmp/inventoriy",
:path=>":rails_root/tmp/inventories/:basename_.:extension"
  has_attached_file :material_list, :url=>"/tmp/material_list",
:path=>":rails_root/tmp/material_lists/:basename_.:extension"
  accepts_nested_attributes_for :material_list, :allow_destroy => true  
  accepts_nested_attributes_for :inventory, :allow_destroy => true  


private

  def change_file_name_inventory
    extension = File.extname(inventory_file_name).downcase
    self.inventory.instance_write(:inventory_file_name,
"#{:current_user}#{extension}")
  end

  def change_file_name_material_list
    extension = File.extname(material_list_file_name).downcase
    self.material_list.instance_write(:material_list_file_name,
"#{:current_user}#{extension}")
  endend

Controller:

class UploadFilesController < ApplicationController

  before_filter :authenticate_user!
  # GET /uploads/new
  # GET /uploads/new.json
  def new
    @upload_files = UploadFiles.new
    @upload_files.current_user = current_user.email
    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @upload_files }
    end
  end

  def create
    @upload_files = UploadFiles.create(params[:upload_files])
    @upload_files.current_user = current_user.email
    respond_to do |format|
      if @upload_files.save
      else
        format.html { render action: "new" }
        format.json { render json: @upload_files.errors, status:
:unprocessable_entity }
      end
    end
  endend

the question is, how can I do to upload the filenames as*
**inventory_name_file_username.extension
*and* material_list_file_name_username.extension*

and if there''s any way of avoid two methods (one for each attachment),
by
making just one that appends the username at the end of the file_name... 
I''m new to Ruby, Rails, Devise and Paperclip and I have no idea how to
do
this. I''ve read about it (changing file_name to random, include a date
and
such) and tried to fix it according to it, but no luck so far.

Why i''m doing this:

A user can upload one inventory and one material list, when it does, a new 
file is generated after processing the uploaded files, then, the user 
downloads the generated file and if the user uploads a new inventory and/or 
a new material list, it''s overwritten, because I don''t want
the server to
be full of unnecesary files (the inventory changes everyday and the 
material list is rarely the same). So, this way, if a user ''X''
uploads an
inventory file today and it uploads several material lists, only the 
material lists are overwritten each time, however another user
''Y'' may be
using the system and the same time, and if user ''Y'' uploads a
different
inventory, I don''t want the inventory user ''x'' uses
to be overwritten.

EDIT:

I think besides the obvious issue, it has to do bit 
:path=>":rails_root/tmp/uploaded_files/inventories/:basename_.:extension"

because I tried to just append a random number and it still takes the 
name_.extension although the random number seems to be right and
"should"
work ...

self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}")

took it from here: 
http://trevorturk.com/2009/03/22/randomize-filename-in-paperclip/


I''d appreciate any help you''re able to offer me. Thank you in
advance.

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On Oct 1, 2013, at 3:40 PM, Monserrat Foster
<monsefoster-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I think besides the obvious issue, it has to do bit
Well, no, it more likely has to do with the line of code pointed out in the
error message ;-)

-- 
Scott Ribe
scott_ribe-ZCQMRMivIIdUL8GK/JU1Wg@public.gmane.org
http://www.elevated-dev.com/
(303) 722-0567 voice




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lol. I meant, If i replace self.inventory.instance_write(:
inventory_file_name, "#{:current_user}#{extension}") for 

self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}")

the error disappears but, the file_name doesn''t change. it seems to be
saving as :rails_root/tmp/uploaded_files/inventories/:basename_.:extension
ignoring the self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}") line


On Tuesday, October 1, 2013 5:21:03 PM UTC-4:30, Scott Ribe
wrote:
>
> On Oct 1, 2013, at 3:40 PM, Monserrat Foster
<monse...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org<javascript:>>
> wrote: 
>
> > I think besides the obvious issue, it has to do bit 
>
> Well, no, it more likely has to do with the line of code pointed out in 
> the error message ;-) 
>
> -- 
> Scott Ribe 
> scott...-ZCQMRMivIIdUL8GK/JU1Wg@public.gmane.org <javascript:> 
> http://www.elevated-dev.com/ 
> (303) 722-0567 voice 
>
>
>
>
>
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I read this:

http://stackoverflow.com/questions/1146848/generating-a-unique-file-path-with-polymorphic-paperclip

and it could work, but I have no idea how to do have a reference in your 
model to user table (say user_id), you can do sth like that 
attachment.instance.user_id

Could someone please give me an example? 

On Tuesday, October 1, 2013 5:32:00 PM UTC-4:30, Monserrat Foster
wrote:
>
> lol. I meant, If i replace self.inventory.instance_write(:
> inventory_file_name, "#{:current_user}#{extension}") for 
>
> self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}")
>
> the error disappears but, the file_name doesn''t change. it seems
to be saving as :rails_root/tmp/uploaded_files/inventories/:basename_.:extension
ignoring the self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}") line
>
>
> On Tuesday, October 1, 2013 5:21:03 PM UTC-4:30, Scott Ribe wrote:
>>
>> On Oct 1, 2013, at 3:40 PM, Monserrat Foster
<monse...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>> > I think besides the obvious issue, it has to do bit 
>>
>> Well, no, it more likely has to do with the line of code pointed out in
>> the error message ;-) 
>>
>> -- 
>> Scott Ribe 
>> scott...-ZCQMRMivIIdUL8GK/JU1Wg@public.gmane.org 
>> http://www.elevated-dev.com/ 
>> (303) 722-0567 voice 
>>
>>
>>
>>
>>
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On Oct 1, 2013, at 4:27 PM, Monserrat Foster
<monsefoster-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I read this:
> 
>
http://stackoverflow.com/questions/1146848/generating-a-unique-file-path-with-polymorphic-paperclip
> 
> and it could work, but I have no idea how to do have a reference in your
model to user table (say user_id), you can do sth like that
attachment.instance.user_id
> 
> Could someone please give me an example? 
> 
> On Tuesday, October 1, 2013 5:32:00 PM UTC-4:30, Monserrat Foster wrote:
> lol. I meant, If i replace
self.inventory.instance_write(:inventory_file_name,
"#{:current_user}#{extension}") for
> self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}")
> the error disappears but, the file_name doesn''t change. it seems
to be saving as :rails_root/tmp/uploaded_files/inventories/:basename_.:extension
ignoring the self.inventory.instance_write(:inventory_file_name,
"#{SecureRandom.hex(16)}#{extension}") line
Are you also removing the assignment to current_user when you do that? Because
that''s where the error comes from.

What is inventory_file_name? Why do you expect that setting it will actually set
the file name?


-- 
Scott Ribe
scott_ribe-ZCQMRMivIIdUL8GK/JU1Wg@public.gmane.org
http://www.elevated-dev.com/
(303) 722-0567 voice




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