Formatting JSON in Serializer - Django REST - json

Question

I am new to Django and Django-REST and I was tasked to create a serializer.
The output of my serializer looks like this:
{
"count": 1,
"next": null,
"previous": null,
"results": [
{
"id": 1,
"name": "a",
"description": "a",
"price": "1.00",
"images": [
{
"image_addr": "http://127.0.0.1:8000/media/products/Screenshot_from_2018-05-16_15-07-34.png",
"product": 1
},
{
"image_addr": "http://127.0.0.1:8000/media/products/Screenshot_from_2018-05-16_16-42-55.png",
"product": 1
}
]
}
]
}
How can i tweak my serializer in a way that my output would look like this:
{
"count": 1,
"next": null,
"previous": null,
"results": [
{
"id": 1,
"name": "a",
"description": "a",
"price": "1.00",
"images": [
"http://127.0.0.1:8000/media/products/Screenshot_from_2018-05-16_15-07-34.png",
"http://127.0.0.1:8000/media/products/Screenshot_from_2018-05-16_16-42-55.png"
]
}
]
}
The serializers that I am using are:
class ProductImageSerializer(serializers.ModelSerializer):
class Meta:
model = ProductImage
fields = ('image_addr', 'product')
and
class ProductSerializer(serializers.ModelSerializer):
images = ProductImageSerializer(many=True, read_only=True)
class Meta:
model = Product
fields = ('id', 'name', 'description', 'price','images')
My models used are:
class ProductImage(models.Model):
image_addr = models.FileField(upload_to='products/',null=True)
product = models.ForeignKey(Product, on_delete=models.CASCADE, related_name='images')
and
class Product(models.Model):
name = models.CharField(max_length=150)
price = models.DecimalField(max_digits=9, decimal_places=2)
product_count = models.IntegerField(blank=True, default=0, validators=[MinValueValidator(0)])
description = models.TextField()
category = models.ManyToManyField(Category)
objects = ProductManager()
My view used is:
class CategoryProductList(generics.ListAPIView):
serializer_class = ProductSerializer
def get_queryset(self):
queryset = Product.objects.filter(category__id=self.kwargs['pk'])
return queryset

Answer 1

You can use SerializerMethodField for your purpose. Change your ProductSerializer as below
class ProductSerializer(serializers.ModelSerializer):
images = serializers.SerializerMethodField(read_only=True, source='images')
def get_images(self, model):
return model.images.values_list('image_addr', flat=True)
class Meta:
model = Product
fields = ('id', 'name', 'description', 'price', 'images')