i am working with djangorestFramework and in the serializers i have an image which when i fetch it tells me that 'utf-8' error:

it is a model:

from django.db import models
from .categoria import Categoria


class Productos(models.Model):
    
    
    def productos_directory_path(instance,filename):
        return 'productos/{0}'.format(filename)
    
    id_productos = models.AutoField(primary_key=True)
    id_categoria = models.ForeignKey(Categoria, on_delete=models.CASCADE)
    codigo = models.IntegerField(default=0)
    producto = models.CharField('producto', max_length = 100)
    imagen = models.ImageField(upload_to=productos_directory_path, null=True,blank=True)
    stock = models.IntegerField(default=0)
    precio_compra = models.FloatField(default=0.0)
    precio_venta = models.FloatField(default=0.0)
    venta = models.IntegerField(default=0.0)
    fecha = models.DateTimeField(auto_now_add=True)

    
    def __str__(self):
        return self.producto

it is a serializer

from rest_framework import serializers

from backend.models.productos import Productos

from backend.models.categoria import Categoria
from backend.serializers.CategoriaSerializers import Categoriaserializers

class ProductosSerializers(serializers.ModelSerializer):
    #Categorias = Categoriaserializers()
    class Meta:
        model = Productos
        fields = "__all__"

this on localhost:8000/products returns this:

    [
    {
        "id_productos": 8,
        "codigo": 12,
        "producto": "Carro",
        "imagen": "http://localhost:8000/media/productos/bulgakov-mijail-el-maestro-y-margarita.jpg",
        "stock": 0,
        "precio_compra": 0.0,
        "precio_venta": 0.0,
        "venta": 0,
        "fecha": "2021-10-12T16:02:06.167755Z",
        "id_categoria": 2
    }
]

but in addition to that, I need to bring in the product category and I do it this way:

from rest_framework import serializers

from backend.models.productos import Productos

from backend.models.categoria import Categoria
from backend.serializers.CategoriaSerializers import Categoriaserializers

class ProductosSerializers(serializers.ModelSerializer):
    Categorias = Categoriaserializers()
    class Meta:
        model = Productos
        fields = "__all__"
        #fields =  ["id_productos","codigo","producto","imagen","stock","precio_compra","precio_venta","venta","fecha","Categorias"]
        
    def to_representation(self, obj):
        productos = Productos.objects.get(id_productos=obj.id_productos)
        categorias = Categoria.objects.get(productos=obj.id_productos)
            
        return{
            'id_producto': productos.id_productos,
            "codigo": productos.codigo,
            "producto" : productos.producto ,
            "imagen": str(productos.imagen),
            "stock": productos.stock,
            "precio_compra" : productos.precio_compra,
            "precio_venta": productos.precio_venta,
            "venta": productos.venta,
            "fecha": productos.fecha,
            "Categorias":{
                "id_categoria": categorias.id_categoria,
                "categoria": categorias.categoria,
                "fecha": categorias.fecha
            }
        }

and I get this back

[
    {
        "id_producto": 8,
        "codigo": 12,
        "producto": "Carro",
        "imagen": "productos/bulgakov-mijail-el-maestro-y-margarita.jpg",
        "stock": 0,
        "precio_compra": 0.0,
        "precio_venta": 0.0,
        "venta": 0,
        "fecha": "2021-10-12T16:02:06.167755Z",
        "Categorias": {
            "id_categoria": 2,
            "categoria": "Componentes",
            "fecha": "2021-10-11T15:50:24.101968Z"
        }
    }
]

as you can see I get the image as ("products/bulgakov-mijail-the-teacher-and-margarita.jpg ) by the

"imagen": str(products.imagen)

because if I remove it, I get the following error message

how can I get the ulr of the image as in the first code snippet, and remove the str()

thanks in advance

CodePudding user response：

you didnt say what type imagen is but if its ImageField there is a property for named url you can wrote "imagen": products.imagen.url instead of "imagen": str(products.imagen)