Instruction: Describe how to extend or customize the validation logic of a Django model.
Context: The candidate should demonstrate an understanding of Django's model validation system and how to customize it for specific business logic.
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First and foremost, Django provides a powerful ORM that includes a comprehensive system for validating model data. This system works out of the box for many common use cases. However, when the business logic requires more nuanced data validation, Django offers several extension points to customize this behavior.
To customize model validation in Django, I typically follow a structured approach:...