db.models.Model

Note

You may be tempted to customize the model by overriding the __init__ method. If you do so, however, take care not to change the calling signature as any change may prevent the model instance from being saved. Rather than overriding __init__, try using one of these approaches:

1. Add a classmethod on the model class:

   from django.db import models
   
   class Book(models.Model):
       title = models.CharField(max_length=100)
   
       @classmethod
       def create(cls, title):
           book = cls(title=title)
           # do something with the book
           return book
   
   book = Book.create("Pride and Prejudice")
   

2. Add a method on a custom manager (usually preferred):

   class BookManager(models.Manager):
       def create_book(self, title):
           book = self.create(title=title)
           # do something with the book
           return book
   
   class Book(models.Model):
       title = models.CharField(max_length=100)
   
       objects = BookManager()
   
   book = Book.objects.create_book("Pride and Prejudice")