django models

[Soumen Khatua]

Hi Folks,

How this underline code works?

models.py

class Address(models.Model):

    first_name = models.CharField(max_length=256, blank=True)

    last_name = models.CharField(max_length=256, blank=True)

    company_name = models.CharField(max_length=256, blank=True)

    street_address_1 = models.CharField(max_length=256, blank=True)

    street_address_2 = models.CharField(max_length=256, blank=True)

    city = models.CharField(max_length=256, blank=True)

    city_area = models.CharField(max_length=128, blank=True)

    postal_code = models.CharField(max_length=20, blank=True)

    country = CountryField()

    country_area = models.CharField(max_length=128, blank=True)

    phone = PossiblePhoneNumberField(blank=True, default='')

     def __eq__(self, other):

               return self.as_data() == other.as_data()

     __hash__ = models.Model.__hash__

Thank you.

        

   

  

[Skyisblue]

Soumen,

The function looks to compare two Address objects. The as_data() call is custom made. I saw it documented in your other post. It removes the Primary Key and User from the Address object. I presume this is so they can compare the hash of one address to the hash of another.  

Regards,

Joe

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[Soumen Khatua]

Yes,You are right as_data is custom made function inside the same class,here is the code:

def as_data(self):

        """Return the address as a dict suitable for passing as kwargs.Result does not contain the primary key or an associated user."""

        data = model_to_dict(self,exclude=['id','user'])

        if isinstance(data['country'], Country):

            data['country'] = data['country'].code

            if isinstance(data['phone'], PhoneNumber):

                #as_e164 is a phonenumber format information

                data['phone'] = data['phone'].as_e164

        return data

But here other is an argument so we need to pass it then without passing how we can compare with self.as_data varibale?

Thank you for your response.

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[Soumen Khatua]

Hi Folks,

I didn't  understand this code please help me to understand this code.

class AddressQueryset(models.QuerySet):

    def annotate_default(self, user):

        # Set default shipping/billing address pk to None

        # if default shipping/billing address doesn't exist

        default_shipping_address_pk, default_billing_address_pk = None, None

        if user.default_shipping_address:

            default_shipping_address_pk = user.default_shipping_address.pk

        if user.default_billing_address:

            default_billing_address_pk = user.default_billing_address.pk

        return user.addresses.annotate(

        user_default_shipping_address_pk=Value(

        default_shipping_address_pk, models.IntegerField()),

        user_default_billing_address_pk=Value(

                default_billing_address_pk, models.IntegerField()))

default_shipping_address & default_billing_address_pk is available in my User table it is a foreignkey of Address table  and  addresses is also avialable in my User table as ManytoManytoField refering to same Address Table and the last i'm using this inside Address table just like this :

objects = AddressQueryset.as_manager()

Thank You

[sachinbg sachin]

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