Comments on: Ruby On Rails Polymorphic Paperclip Plugin Tutorial

By: Mihai

Mihai — Fri, 14 May 2010 17:16:28 +0000

adam, found the solution to your problem?

By: rtacconi

rtacconi — Sun, 24 Jan 2010 00:53:32 +0000

I am not able to save any file. I always get object.assets.size = 0

By: Jayme

Jayme — Fri, 20 Nov 2009 01:14:01 +0000

Where can I change the accepted content file type?

By: adam

adam — Fri, 13 Nov 2009 06:08:07 +0000

sorry…that should’ve been:

<% @project.assets.each do |asset| %>

<%= image_tag asset.url(:thumb) %>

<%= link_to “delete”, asset.detach(asset) %>

<% end %>

By: adam

adam — Fri, 13 Nov 2009 06:06:22 +0000

I cannot get

to work. I get “ActiveRecord::RecordNotFound” when i try to view the page with that code in it.

By: Antoine

Antoine — Thu, 05 Nov 2009 02:55:01 +0000

I’m using polymorphic paperclip to have more than one type of attachment per model object. For instance a user can have an image and a pdf. I can upload both but i want to have to separate form fields for it and put different types of attachments in different folders. what is the best way to make implement that functionality with polymorphic paperclip?

By: Kristian Mandrup

Kristian Mandrup — Tue, 25 Aug 2009 12:59:22 +0000

I thought the controller logic was missing, but it turns out it works by pure magic!

You have to be careful, that if you add the polymorphic association to user, then :data must be added to attr_accessible in order to allow mass assignment (or add :data manually after mass assignment in the controller method – update/create!)

Something similar to this… not sure how exactly I must confess (anyone?)

def update
@user.update_attributes(params[:user])
@user.data = params[:user[:data]])
…
end

By: Kristian Mandrup

Kristian Mandrup — Tue, 25 Aug 2009 10:19:49 +0000

How can I create a named scope to get the first asset referenced by a model? fx:

class User

acts_as_polymorphic_paperclip
has_one :main_pic,
:class_name => ‘Asset’

>> User.first.main_pic

Mysql::Error: Unknown column ‘assets.user_id’ in ‘where clause’: SELECT * FROM `assets` WHERE (`assets`.user_id = 1) LIMIT 1

I guess I could create a method, but not as elegant or flexible (can’t be nested with other scoped etc.)

def first_pic
assets[0]
end

Any ideas?

By: Andreas Ludewig

Andreas Ludewig — Thu, 28 May 2009 16:02:06 +0000

Oh, sorry I diddnt get the hole message submitted: I thought about @asset instead @document.

By: Andreas Ludewig

Andreas Ludewig — Thu, 28 May 2009 15:58:18 +0000

Many thanks for this tutorial.
Some questions:
1)What is the structure of the join table and the join model? That could be interesting, too.

2)Shouldn´t it be
{ :multipart => true }) do |f| %>
in the form (instead @ document)??

3) I think there is the “install” command missing in the installing call.

Many Thanks so far.
Andreas