Hello Soumen, you should use a CharField with the primary_key=True 
attribute for your model. This way no no automatic primary key field is 
generated, your field will be implicitly unique and non-null though. Only 
one primary key is allowed in a model.

class Foo(models.Model)
    id = models.CharField(max_length=15, primary_key=True)

Regards,
Oleg

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