carrierwave mongo issues

# Here's my CarrierWave Config
require 'carrierwave/orm/mongomapper'
CarrierWave.configure do |config|
  config.storage = :grid_fs
  config.grid_fs_access_url = "/attachments/show"
  config.grid_fs_database = "files"
  config.grid_fs_host = "localhost"
end

# Here's my uploader
class LogoUploader < CarrierWave::Uploader::Base
end

# Here's what I added to my MongoMapper Model
mount_uploader :logo, LogoUploader

# Here's my controller action:
# GET /attachments/logos/:id
def logo
  @model = MyModel.find_by_id(params[:id])
  @logo = @model.logo
  send_data @logo.read, :type => @logo.file.content_type
end

# my model logo.url seems fairly useless. the same url shows up for every single one, so I cant use it in my controller action
@model.logo.url => "/attachments/show/uploads/logo.gif"

I have to use: "/attachments/logo/#{@model.id}" in my image href