Rails - Sep 2007 - Using foreign key in store_dir

I am new to Ruby/Rails, and I''m writing an app that allows the user
to
upload mulitple images to attach to a user. The user data is stored
in
the Entity model, and the picture data (including file_column) is
stored
in the Picture model, which has a foreign key to the entity.id. I
want
to store the pictures in a directory that has the Entity''s id as the
last directory name, not the picture''s id. Base upon what I''ve
read,
I
have to use a callback procedure in Picture to create the appropriate
directory. This is what I came up with:

_*entity.rb*_
class Entity < ActiveRecord::Base
    validates_presence_of :lastname, :address1, :zip, :phone

    belongs_to :entitytype
    has_and_belongs_to_many :entitysubtypes
    belongs_to :state
    belongs_to :city
    belongs_to :agency
    belongs_to :agent
    belongs_to :screentemplate
    has_many :comments
    has_many :pictures
end

*_picture.rb_*
class Picture < ActiveRecord::Base
    belongs_to :entity
    file_column :image,
        :web_root => "/picture/entity/",
        :store_dir => :new_store_dir

    def new_stor_dir
        return "/picture/entity/" + :entity.id + "/"
    end

_*entity_controller.rb*_
   def upload
        @entity = Entity.find(params["id"])
        @pictures = @entity.pictures.build(params[:pictures])
        @entity.pictures.each { |pic| pic.attributes
params[:picture][pic.id.to_s] }
        if @entity.update_attributes(params[:entity])
            flash[:notice] = "Pictures uploaded."
        else
            flash[:notice] = "Problem uploading pictures."
        end
        render :action => ''show'', :id => @entity
    end


I must be doing something wrong because I get no file name in the
database. I suspect that, since it worked fine without the callback
label in store_dir, it must be something I''m doing. Any ideas? Any
help
would be greatly appreciated!

Thanks.


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