def get_variants(self, obj):
        data = {}
        if (obj.item_id):
            variants = Product.objects.filter(Q(item_id=obj.item_id), Q(num_in_stock__gt=0),
                                              Q(num_in_stock__gt=F('num_allocated')))
            for variant in variants:
                img = variant.primary_image()
                if isinstance(img, dict):
                    original_img = str(img['original'])
                else:
                    original_img = img.original.url
                data[variant.pk] = [variant.pk, variant.title, original_img]
        return data