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Let's implement (1-M) relation on Django (ForeignKey)

from django.db import models

class Address(models.Model):
    .....
    .....
    ..... 

class User(models.Model):
    .....
    .....
    ..... 
    address = models.OneToOneField(Address, on_delete=models.CASCADE)

I think you need to change that line address To be ForeignKey instead of OneToOne