Stock model has a OneToMany relationship with Data model. I am using the to_field to link them via model_number field.

class Stock(models.Model):
    model_number = models.CharField(max_length=100, unique=True, null=True)
    model = models.CharField(max_length=100)
    brand = models.CharField(max_length=100)
    msrp = models.IntegerField(default=0)

    def __str__(self):
        return f"{self.brand} - {self.model} - {self.model_number}"


class Data(models.Model):
    model_number = models.ForeignKey(Stock, to_field='model_number', on_delete=models.CASCADE)
    price = models.FloatField()
    date = models.DateField()

    def __str__(self):
        return self.model_number

I have my serializers to show each model number and then the nested relationship of data.

class DataSerializer(serializers.ModelSerializer):
    class Meta:
        model = Data
        fields = '__all__'


class StockSerializer(serializers.ModelSerializer):
    data = DataSerializer(many=True, read_only=True)

    class Meta:
        model = Stock
        fields = ['brand', 'model', 'model_number', 'msrp', 'data']

However the price does not return at all in my API view. Not sure where I am going wrong on this.