django import with csvimport.py fails when trying to create a reference to a foreign key

current django project is a mini shop thing.

im trying to create the concept of having products which could have a foreign key of 开发者_StackOverflow社区a Brand and a Category. however the import im using is this one http://djangosnippets.org/snippets/788/

and it fails when trying to create the object on the foreign key field. it puts the error message ValueError: Cannot assign "'Brand.dubkorps'": "Product.brand1" must be a "Brand" instance.

I get that im not putting the right value in the csv file for the foreign key i'm trying to reference, my question is, how do i work out what the value is for this particular foreign key?

love to hear from anyone who has done something similar with csvimport.

---

if in the import file you have the ID of an existing brand you have two choiches:

brand = Brand.objects.get(pk= csv_val)
product.brand = brand

or

Product.brand_id = csv_val

hope it helps