#models.py
class ItemPicture(models.Model):
    item = models.ForeignKey(Item, on_delete=models.CASCADE, related_name='pictures')
    img = models.ImageField(upload_to=pathfinder, blank=True)

    def __str__(self):
        return f'{self.item.part_number}'

#admin.py
class PictureInline(admin.StackedInline):
    model = ItemPicture
    extra = 1


@admin.register(Item)
class AdminProductItem(admin.ModelAdmin):
    filter_horizontal = ('concepts', 'subcategories', 'accessories',)
    raw_id_fields = ('replacement', 'supplier', 'manufacturer')
    inlines = [PictureInline]

#serializers.py
class ItemPictureUrlSerializer(serializers.RelatedField):
    queryset = ItemPicture

    def to_representation(self, value):
        return self.context['request'].build_absolute_uri(value.img.url)


class ItemSerializer(serializers.ModelSerializer):
    pictures = ItemPictureUrlSerializer(many=True)

    class Meta:
        model = Item
        fields = '__all__'


class SingleItemSerializer(serializers.ModelSerializer):
    pictures = ItemPictureUrlSerializer(many=True)

    class Meta:
        model = Item
        fields = '__all__'
        depth = 1

#views.py
class ItemViewSet(viewsets.ViewSet):
    permission_classes = [HasAPIKey | permissions.IsAdminUser]

    def list(self, request):
        queryset = Item.objects.all()
        serializer = ItemSerializer(queryset, many=True, context={'request': request})
        return Response(serializer.data)

    def retrieve(self, request, pk=None):
        queryset = Item.objects.all()
        item = get_object_or_404(queryset, pk=pk)
        serializer = SingleItemSerializer(item, context={'request': request})
        return Response(serializer.data)