Rails - Dec 2007 - url_for_file_column not works

I am using the file column plugin.

If i upload an image it works correctly but if i want to show an image
it not works.

in my template i insert

url_for_file_column(@core, "image", "thumb")

but return ""

i tried to print @core.image but it is set to nil.

My model is this:

class Core < ActiveRecord::Base
  has_one :forum_topic
  has_many :votes
  has_many :forum_messages ,:through => :forum_topic
  attr_accessible :site,:descriptionm,:image
  file_column :image,:magick=>{
      :geometry=>''600x600>'',:attributes => { :quality
=> 60 },
      :versions => {
        :thumb => {:crop => "1:1", :geometry
=>"30x30",:attributes => {
:quality => 50 } },
        :thumb_big=>{:crop => "1:1", :geometry
=>"62x62",:attributes =>
{ :quality => 50 } }
      }
  }
}

How i can do?
Thanks
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I have noted that if i do it:
url_for_file_column(Core.find(cores.id), "image")
it works.

but if i use url_for_file_column in a template called with:

<%=render(:partial => 
"what",:collection=>Core.find(:all,:conditions=>"id<10"))%>

and content:
url_for_file_column(what, "image")

it not works.
Why?
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