How can I implement the address form in django? This is what I have

Question

Hello guys I'm trying to figure out how to add multiple addresses to a user. So the user can have shipping addresses and home addresses. I kind of guessed reading around but it's not working.

I also created a simple schema (I forgot to include the zipcode):

models.py

class Address(models.Model):
    name = models.CharField(max_length=30)
    address = models.CharField(max_length=50)
    city = models.CharField(max_length=60, default="Miami")
    state = models.CharField(max_length=30, default="Florida")
    zipcode = models.CharField(max_length=5, default="33165")
    country = models.CharField(max_length=50)

    class Meta:
        verbose_name = 'Address'
        verbose_name_plural = 'Address'

    def __str__(self):
        return self.name

# All user data is/should be linked to this profile, so when user gets deleted, all data deletes as well
class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    nick_name = models.CharField('Nick name', max_length=30, blank=True, default='')
    bio = models.TextField(max_length=500, blank=True)
    image = models.ImageField(default='default.jpg', upload_to='profile_pics')
    addresses = models.ManyToManyField(
        Address,
        through='AddressType',
        through_fields=('address', 'profile'),
    )

    # If we don't have this, it's going to say profile object only
    def __str__(self):
         return f'{self.user.username} Profile'  # it's going to print username Profile

    def save(self, *args, **kwargs):
            super().save(*args, **kwargs)

            img = Image.open(self.image.path)

            if img.height > 300 or img.width > 300:
                output_size = (300, 300)
                img.thumbnail(output_size)
                img.save(self.image.path)


class AddressType(models.Model):

    HOME_ADDRESS = 1
    SHIPPING_ADDRESS = 2

    TYPE_ADDRESS_CHOICES = (
        (HOME_ADDRESS, "Home address"),
        (SHIPPING_ADDRESS, "Shipping address"),
    )

    address = models.ForeignKey('Address', on_delete=models.CASCADE)
    profile = models.ForeignKey('Profile', on_delete=models.CASCADE)

    # This is the field you would use for know the type of address.
    address_type = models.PositiveIntegerField(choices=TYPE_ADDRESS_CHOICES)

When I do makemigrations it says:

ERRORS:
users.Profile.addresses: (fields.E339) 'AddressType.address' is not a foreign key to 'Profile'.
        HINT: Did you mean one of the following foreign keys to 'Profile': profile?
users.Profile.addresses: (fields.E339) 'AddressType.profile' is not a foreign key to 'Address'.
        HINT: Did you mean one of the following foreign keys to 'Address': address?

Can someone give me a hand please?

Thank you so much

Answer 1

First a comment about your design ...

So a user can have many addresses, the difference is that can be a home or address or shipping address.

You could use a ManyToManyField and "describe" the relationship through a third model that will have the info whether is shipping or a home address.

First I would rename your 'HomeAddress' to 'Address' so is more semantic, then establish the relationship using through to a third table.

Read ManyToManyFiled docs for more detail.

Example:

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

class Profile(models.Model):
    addresses = models.ManyToManyField(
         'Address', 
         through='AddressInfo'
         through_fields=('address', 'profile')
    )
    # ...

class AddressInfo(models.Model):

    HOME_ADDRESS = 1
    SHIPPING_ADDRESS = 2

    TYPE_ADDRESS_CHOICES = (
        (HOME_ADDRESS, "Home address"),
        (SHIPPIN_ADDRESS, "Shipping address"),
    )

    address = models.ForeignKey('Address', on_delete=models.CASCADE)
    profile = models.ForeignKey('Profile', on_delete=models.CASCADE)

    # This is the field you would use for know the type of address.
    address_type = models.PositiveIntegerField(choices=TYPE_ADDRESS_CHOICES)

About creating the forms ...

You could then write the form for adding an address to some profile having into account the address type.

If you want to add several addresses at the same time, the recommendation is to use a FormSet or a ModelFormSet.