How to filter the child object from Parent model in Django Rest API?

Question

class Tyre(models.Model):
    name = models.CharField(max_length=128)
    description = models.CharField(max_length=256)
    product_type = models.CharField(max_length=128)


class TyrePrices(models.Model):
    tyre = models.ForeignKey(Tyre, on_delete=models.CASCADE)
    price = models.IntegerField()
    discount = models.IntegerField()
    description = models.TextField(max_length=256)
    discount_price = models.IntegerField()
    stock = models.BooleanField(default=True)

This is model, and the requirement is want to filter the tyre according to tyre price range(which is at the second model).

How can I do this?

Answer 1

Tyre.objects.filter(tyreprices__price__gte=x,tyreprices__price__lte=y)

If you want a range. Otherwise drop one or the other. Or adjust for exclusions.

Answer 2

When you have a relation, Django create automaticaly a reverse relation ( doc here :

tyre = models.ForeignKey(Tyre, on_delete=models.CASCADE)

can be noted this way :

tyre = models.ForeignKey(Tyre, on_delete=models.CASCADE, related_name="tyreprices")

For your query just do :

Tyre.objects.filter(tyreprices__price__range=(x,y))