python
34 lines · 1 tab
Priya Sharma
Jan 2026
1 tab
from django.db import models
from django.utils import timezone
from datetime import date
class Person(models.Model):
first_name = models.CharField(max_length=50)
last_name = models.CharField(max_length=50)
date_of_birth = models.DateField()
email = models.EmailField()
@property
def full_name(self):
"""Computed full name from first and last."""
return f'{self.first_name} {self.last_name}'
@property
def age(self):
"""Calculate current age from date of birth."""
today = date.today()
age = today.year - self.date_of_birth.year
if today.month < self.date_of_birth.month or \
(today.month == self.date_of_birth.month and
today.day < self.date_of_birth.day):
age -= 1
return age
@property
def email_domain(self):
"""Extract domain from email address."""
return self.email.split('@')[1] if '@' in self.email else ''
def __str__(self):
return self.full_name
1 file · python
Explain with highlit
Properties let me add computed attributes to models without storing them in the database. I use @property for simple calculations like full name or age. For expensive computations, I consider caching the result in a field and updating it via signals or save override. Properties can't be used in QuerySet filters—use annotate() for that. I keep property logic simple and stateless. For display-only values, properties are cleaner than adding methods. They work seamlessly in templates and serializers, appearing just like regular fields.
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