Foreign Key Django Model

Question

I m trying to create 3 models   Person  Address and Anniversy  The plan is to have one address and one anniversy for each person  But each address and anniversy can have multiple persons   So far I have the following  but I think the OneToMany foreign key  relationships maybe the wrong way round  i e each address can have one person but each person can have multiple addresses   from django db import models  class Person models Model       name   models CharField max length 50      birthday   models DateField        def   unicode   self           return u  s     self name   class Address models Model       person   models ForeignKey Person      address   models CharField max length 150       def   unicode   self           return u  s     self address   class Anniversy models Model       person   models ForeignKey Person      anniversy   models DateField        def   unicode   self           return u  s     self anniversy

User · Accepted Answer

You create the relationships the other way around; add foreign keys to the Person type to create a Many-to-One relationship:

class Person(models.Model):
    name = models.CharField(max_length=50)
    birthday = models.DateField()
    anniversary = models.ForeignKey(
        Anniversary, on_delete=models.CASCADE)
    address = models.ForeignKey(
        Address, on_delete=models.CASCADE)

class Address(models.Model):
    line1 = models.CharField(max_length=150)
    line2 = models.CharField(max_length=150)
    postalcode = models.CharField(max_length=10)
    city = models.CharField(max_length=150)
    country = models.CharField(max_length=150)

class Anniversary(models.Model):
    date = models.DateField()

Any one person can only be connected to one address and one anniversary, but addresses and anniversaries can be referenced from multiple Person entries.

Anniversary and Address objects will be given a reverse, backwards relationship too; by default it'll be called person_set but you can configure a different name if you need to. See Following relationships "backward" in the queries documentation.

User · Answer

I would advise  it is slightly better practise to use string model references for ForeignKey relationships if utilising an app based approach to seperation of logical concerns     So  expanding on Martijn Pieters  answer   class Person models Model       name   models CharField max length 50      birthday   models DateField       anniversary   models ForeignKey           app label Anniversary   on delete models CASCADE      address   models ForeignKey           app label Address   on delete models CASCADE   class Address models Model       line1   models CharField max length 150      line2   models CharField max length 150      postalcode   models CharField max length 10      city   models CharField max length 150      country   models CharField max length 150   class Anniversary models Model       date   models DateField

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