How to list all objects from particular model in django rest framework?

Question

I have two models:

class Product(models.Model):
    name = models.CharField(max_length=200)
    price = models.DecimalField(default=0, decimal_places=2, max_digits=10)

    def __str__(self):
        return self.name

class Receipt(models.Model):
    purchase_date = models.DateTimeField(auto_now=True, null=False)
    shop = models.ForeignKey(Shop, on_delete=models.SET_NULL, null=True)
    products = models.ForeignKey(Product, on_delete=models.SET_NULL, null=True)

    def __str__(self):
        return super().__str__()

My receipt url looks like this:

And i would like it to show list of all products, instead of a number of them. How to do this?

My viewsets:

class ReceiptViewSet(viewsets.ModelViewSet):
    queryset = Receipt.objects.all()
    serializer_class = ReceiptSerializer
    permission_classes = [AllowAny]

class ProductViewSet(viewsets.ModelViewSet):
    queryset = Product.objects.all()
    serializer_class = ProductSerializer
    permission_classes = [AllowAny]
    enter code here

serializers:

class ProductSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Product
        fields = ['id', 'name', 'price']

class ReceiptSerializer(serializers.HyperlinkedModelSerializer):
    products = serializers.PrimaryKeyRelatedField(read_only=True)

    class Meta:
        model = Receipt
        fields = ['id', 'purchase_date', 'shop', 'products']

Sorry for that, i updated my question and added serializers there — santana011
– santana011, Commented Dec 20, 2021 at 9:31

Sumithran · Accepted Answer · 2021-12-20 09:39:06Z

1

You can simply specify nested representations using the depth option

Give this a try

class ReceiptSerializer(serializers.HyperlinkedModelSerializer):
    ... 

    class Meta:
        model = Receipt
        fields = ['id', 'purchase_date', 'shop', 'products']
        depth = 1

Otherwise

class ReceiptSerializer(serializers.HyperlinkedModelSerializer):
    products = ProductSerializer(many=True, read_only=True)
    ... 

    class Meta:
        model = Receipt
        fields = ['id', 'purchase_date', 'shop', 'products']

edited Dec 20, 2021 at 9:39

answered Dec 20, 2021 at 9:33

Sumithran

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5 Comments

santana011 Over a year ago

I tried it and it shows me that: TypeError at /receipts/ 'Product' object is not iterable

Ersain Over a year ago

@santana011 remove the many=True and try again, by the way I don't really understand why you named the related connection in plural

Sumithran Over a year ago

@santana011 how about the first method?

santana011 Over a year ago

It works, but i cant figure out why receipt can have only one product. Whenever i try to add another product to receipt it just switches them

Sumithran Over a year ago

Foreiginkey can have only one relation, in your scenario you can either implement a reverse foreignkey of a manytomany relation.

Eyad · Accepted Answer · 2021-12-20 10:43:23Z

0

I have tried Sumithran 's solution but i made a small adjustment, rather than using serializers.HyperlinkedModelSerializer i used serializers.ModelSerializer and it displayed the products as follows View

Hope it answers what you are looking for :)

from rest_framework import serializers

class ReciptSerializer(serializers.ModelSerializer):
    class Meta:
        model = Receipt
        fields = ['id', 'purchase_date', 'shop', 'products']
        depth = 1

class ProductSerializer(serializers.ModelSerializer):
    class Meta:
        model = Product
        fields = '__all__'

edited Dec 20, 2021 at 10:43

answered Dec 20, 2021 at 10:17

Eyad

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1 Comment

mstgnz Over a year ago

The change should be included in the answer.

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