Rails - Jun 2006 - Dynamic file paths in FileColumn

I have a file uploader application in ROR using the very nice FileColumn 
plugin.  In looking at the source code I can see that there is a 
DEFAULT_OPTION hash with some root path options and such which can be 
merged from an options paramater.  These static path changes are not a 
problem.

My question is dynamic path options.  My upload form, when you boil it 
down, has two fields.  The first is the ''file_column_field''
form helper
which grabs the file off the harddrive and adds its filename to a :path 
attribute of the Model.  The second is a drop down which selects from a 
list of publications that the file belongs to.  This gets written to the 
:publication attribute in the Model.  Id like to pass the :publication 
value to FileColumn so that is can use it in the path.  Being a rather 
poor hobby coder, I am sure that I am missing something very basic.

Here is what I have.  When I run it I get the error ''Cannot convert 
Symbol to String''

new.rhtml
 <%= form_tag ( { :action => "post" }, { :multipart => true
})%>
 Publication:
 <%= collection_select(:xml, :publication_id, @publications, :id, 
:name)%>
 XML File:
 <%= file_column_field "xml", "path" %>
 <%= submit_tag(value = "Create new article") %>
 <%= end_form_tag %>

class UploadController < ApplicationController
    @xml = Xml.new(@params[:xml])
    @xml.save
end

class Xml < ActiveRecord::Base
    file_column :path, {:pub => :publication_id}
end

#small change to FileColumn (appologies to Mr. Kanthak)
module FileColumn # :nodoc:
...
  def self.init_options(defaults, attr)
    options = defaults.dup
    options[:store_dir] ||= File.join(options[:root_path], 
options[:pub])
    options[:tmp_base_dir] ||= File.join(options[:store_dir], "tmp")
    options[:base_url] ||= options[:web_root] + File.join(attr)
    FileUtils.mkpath([ options[:store_dir], options[:tmp_base_dir] ])
    options
  end
...

  def file_column(attr, options={})
    options = DEFAULT_OPTIONS.merge(options) if options
    my_options = FileColumn::init_options(options,
                                          attr.to_s)
  end
...
end

Thanks in advance

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