How can i serialize manytomany django models using DRF - django

Question

How can i get products name and id instead of pro_id and ord_id in output ? but not in string type. for example : "name : somebook" is not a valid option for me.
I just working on this for 2 days without break and i think im missing a little detail but i cant find what is it.
Output i want
[
{
"order_id": 1,
"totalquantity": 12,
"totalprice": 56,
"userid": 1,
"customerAddress": "evka1",
"customerPhone": "539",
"trackNo": 12034,
"products": [
{
"name": "somebook",
"id": 1,
"quantity": 6
},
{
"name": "someotherbook",
"id": 2,
"quantity": 6
}
]
}
]
Output i get
[
{
"order_id": 1,
"totalquantity": 12,
"totalprice": 56,
"userid": 1,
"customerAddress": "evka1",
"customerPhone": "539",
"trackNo": 12034,
"products": [
{
"pro_id": 2,
"ord_id": 1,
"quantity": 6
},
{
"pro_id": 3,
"ord_id": 1,
"quantity": 6
}
]
}
]
Order model
class Order(models.Model):
order_id = models.AutoField(primary_key=True)
totalquantity = models.IntegerField(default=0, null=True)
totalprice = models.IntegerField(default=0, null=True)
userid = models.IntegerField(default=0, null=True)
trackNo = models.IntegerField(default=0, null=True)
billNo = models.IntegerField(default=0, null=True)
customerAddress = models.CharField(max_length=30,default="nil", null=True)
customerPhone = models.CharField(max_length=30,default="nil", null=True)
Order Serializer
class OrderSerializer(serializers.ModelSerializer):
products = ProductOrderSerializer(many=True, read_only=True)
class Meta:
model = Order
fields = ('order_id', 'totalquantity', 'totalprice', 'userid', 'customerAddress', 'customerPhone', 'trackNo', 'products')
Product Model
class Product(models.Model):
name = models.CharField(max_length=30,default="nil", null=True)
author = models.CharField(max_length=30,default="nil", null=True)
date = models.DateField(null=True)
price = models.FloatField(default=0, null=True)
quantity = models.IntegerField(default=0, null=True)
soldcount = models.IntegerField(default=0, null=True)
category = models.CharField(max_length=30,default="nil", null=True)
Product Serializer
class ProductSerializer(serializers.ModelSerializer):
class Meta:
model = Product
fields = ('id', 'name', 'author', 'date', 'price', 'quantity', 'soldcount', 'category')
ProductOrder Model
class ProductOrder(models.Model):
pro_id = models.IntegerField(default=0,null=True)
ord_id = models.ForeignKey(Order, related_name='products')
quantity = models.IntegerField(default=0, null=True)
ProductOrder Serializer
class ProductOrderSerializer(serializers.ModelSerializer):
class Meta:
model = ProductOrder
fields = ('pro_id', 'ord_id', 'quantity')

Answer 1

The output you desired can be achieved with nested serializers in django-rest-framework,
But, it needs some refactoring in your models,
You need to add a ForeignKey to the model ProductOrder towards the Product model, inorder to attain a ManyToMany relation,
class ProductOrder(models.Model):
pro_id = models.ForeinKey(Product, related_name='orders', default=0,null=True)
ord_id = models.ForeignKey(Order, related_name='products')
quantity = models.IntegerField(default=0, null=True)
Also, in your serializers,
class ProductSerializer(serializers.ModelSerializer):
class Meta:
model = Product
fields = ('name', 'id', 'quantity')
class ProductOrderSerializer(serializers.ModelSerializer):
details = ProductSerializer(source='pro_id', read_only=True)
class Meta:
model = ProductOrder
fields = ('details', )
class OrderSerializer(serializers.ModelSerializer):
products = ProductOrderSerializer(many=True, read_only=True)
class Meta:
model = Order
fields = ('totalquantity', 'totalprice', 'userid',
'trackNo', 'billNo', 'customerAddress', 'customerPhone',
'products')
You could call OrderSerializer and get the output as you desired,
def get(self, request, *args, **kwargs):
orders = Order.objects.all()
serializer = OrderSerializer(orders, many=True)
return Response(serializer.data)
The output will be like this,
[
{
"totalquantity": 0,
"totalprice": 0,
"userid": 0,
"trackNo": 0,
"billNo": 0,
"customerAddress": "nil",
"customerPhone": "nil",
"products": [
{
"details": {
"name": "nil",
"id": 1,
"quantity": 0
}
},
{
"details": {
"name": "nil",
"id": 1,
"quantity": 0
}
}
]
}
]

Answer 2

I solved the problem when i changed ProductOrderSerializer to :
class ProductListingSerializer(serializers.RelatedField):
def to_representation(self, value):
dict={}
dict['name'] = value.pro_id.name
dict['id'] = value.pro_id.pk
dict['quantity'] = value.quantity
return dict
but im in "my code works i don't know why" situation now :D