# models
class Item(models.Model):
    name = models.CharField(max_length=120)
    category = models.ForeignKey(Category, on_delete=models.PROTECT)
    images = models.ManyToManyField('Image', related_name='item_images')

class Image(models.Model):
    img = models.ImageField(upload_to='images/%Y/%m/%d')
    upload_date_time = models.DateTimeField(auto_now_add=True)


# view
class ItemListAPIView(ListAPIView):
    queryset = Item.objects.all()
    serializer_class = ItemSerializer
    permission_classes = [IsMerchantOrReadOnly]

# serializers
class ImageSerializer(serializers.ModelSerializer):
    class Meta:
        model = Image
        fields = ("img", "upload_date_time")

class ItemSerializer(serializers.ModelSerializer):
    category = CategorySerializer(read_only=True)
    images = ImageSerializer(many=True)

    class Meta:
        model = Item
        fields = "__all__"