# models.py
class ItemAttribute(models.Model):
	category = models.ForeignKey(Category)
	name = models.CharField(max_length=80)

class ItemAttributeValue(models.Model):
	product = models.ForeignKey(Item)
	attribute = models.ForeignKey(ItemAttribute, related_name='attribute')
	value = models.CharField(max_length=80)

# views.py
def macbook_view_by_id(request, macbook_id):
	characteristics = ItemAttribute.objects.filter(category=3)
	# values = ItemAttributeValue.objects.filter(product=macbook_id)
	return render(request, 'macbook_page.html', \
		{'characteristics': characteristics, 'nbar': 'macbook'})

#template.html
{% for characteristic in characteristics %}
{{characteristic.name}}:{{characteristic.attribute.value}}
{% endfor %}