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:

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   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):

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   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")