# Django 2.2.9.dev20191202104323 文档

# 模型

Model API reference. For introductory material, see 模型.

- 模型字段参考
- Field attribute reference
- Model index reference
- Constraints reference
- Model `_meta` API
- 关系对象参考
- Model class reference
- Model `Meta` options
- Model instance reference
- `QuerySet` API reference
- Lookup API reference
- Query Expressions
- Conditional Expressions
- Database Functions