django-models

Business logic belongs in models and managers, not views. Views orchestrate workflows; models implement domain behavior. This principle creates testable, reusable code that stays maintainable as complexity grows.

Good: Model methods handle business rules, state transitions, validation Bad: Views contain if/else logic for domain rules, calculate derived values

Custom QuerySet classes are your secret weapon. They make queries reusable, chainable, and testable.

Django 模型设计模式强调胖模型/瘦视图、QuerySet 优化和领域逻辑封装。在设计模型、优化查询、实现业务逻辑或使用 ORM 时使用。 来源：kjnez/claude-code-django。