How to create this type of relationship using Django Models

Question

After seeing a modeling that I should implement in Django, I was a little confused and I will explain what I tried to do and what was sent to me. The following image is the relationship I should implement in Django

What I tried to do was:

class Contato(models.Model):
    pessoa = models.OneToOneField(Pessoa)

class Pessoa(models.Model):
    contato = models.ForeignKey(Contato)

But this does not work, both classes are in the same file. I read the documentation of Manytomanyfield, Onetoonefield and Foreignkey, but what makes me confused is the model wanting the varialvel in the two classes, in previous models that I saw existed this same relation, but the varialvel only existed in one of the classes. What is the right way to implement this?

Answer 1

I understand that a person can have one or more contacts, right?

Take a look below:

from django.db import models

class Pessoa(models.Model):
    first_name = models.CharField(max_length=20)
    last_name = models.CharField(max_length=40)

    def __str__(self):
        return "%s %s" % (self.first_name, self.last_name)

class Contato(models.Model):
    contato = models.CharField(max_length=50)
    pessoa = models.ForeignKey(Pessoa, on_delete=models.CASCADE)

    def __str__(self):
        return self.contato

    class Meta:
        ordering = ['pessoa']

I hope it helps.