课程介绍
异常处理 Exceptions
- REST framework定义的异常

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                    课程介绍
                ](_index_)

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                    引入DjangoRESTframework
                ](c01-introducetodrf_index)
        - 
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                    Web应用模式
                ](c01-introducetodrf_separatedfrontendandbackend)

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                    认识RESTful
                ](c01-introducetodrf_introducetorest)

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                    RESTful设计方法
                ](c01-introducetodrf_howtodesignrest)

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                    使用Django开发REST接口
                ](c01-introducetodrf_developrestapiwithdjango)

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                    明确REST接口开发的核心任务
                ](c01-introducetodrf_coretasktodeveloprestapi)

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                    DjangoRESTframework简介
                ](c01-introducetodrf_aboutdrf)

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                    DRF工程搭建
                ](c02-drfproject_index)
        - 
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                    环境安装与配置
                ](c02-drfproject_installandconfig)

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                    见识DRF的魅力
                ](c02-drfproject_thefirstdrfprogram)

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                    Serializer序列化器
                ](c03-serializer_index)
        - 
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                    定义Serializer
                ](c03-serializer_declaring)

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                    序列化使用
                ](c03-serializer_serializing)

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                    反序列化使用
                ](c03-serializer_deserializing)

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                    模型类序列化器ModelSerializer
                ](c03-serializer_modelserializer)

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                    视图
                ](c04-view_index)
        - 
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                    Request与Response
                ](c04-view_requestandresponse)

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                    视图概览
                ](c04-view_view)

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                    视图说明
                ](c04-view_viewintroduction)

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                    视图集ViewSet
                ](c04-view_viewset)

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                    路由Router
                ](c04-view_routers)

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                    其他功能
                ](c05-components_index)
        - 
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                    认证
                ](c05-components_authentication)

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                    权限
                ](c05-components_permissions)

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                    限流
                ](c05-components_throttling)

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                    过滤
                ](c05-components_filtering)

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                    排序
                ](c05-components_ordering)

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                    分页
                ](c05-components_pagination)

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                    版本
                ](c05-components_versioning)

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                    异常处理
                ](c05-components_exceptions)

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                    自动生成接口文档
                ](c05-components_documents)

          [
              Published with GitBook
          ](https://www.gitbook.com)

课程介绍

异常处理 Exceptions

REST framework提供了异常处理，我们可以自定义异常处理函数。

from rest_framework.views import exception_handler
def custom_exception_handler(exc, context):
    # 先调用REST framework默认的异常处理方法获得标准错误响应对象
    response = exception_handler(exc, context)
    # 在此处补充自定义的异常处理
    if response is not None:
        response.data['status_code'] = response.status_code
    return response

在配置文件中声明自定义的异常处理

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'my_project.my_app.utils.custom_exception_handler'
}

如果未声明，会采用默认的方式，如下

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler'
}

例如：
补充上处理关于数据库的异常

from rest_framework.views import exception_handler as drf_exception_handler
from rest_framework import status
from django.db import DatabaseError
def exception_handler(exc, context):
    response = drf_exception_handler(exc, context)
    if response is None:
        view = context['view']
        if isinstance(exc, DatabaseError):
            print('[%s]: %s' % (view, exc))
            response = Response({'detail': '服务器内部错误'}, status=status.HTTP_507_INSUFFICIENT_STORAGE)
    return response

REST framework定义的异常

APIException 所有异常的父类
ParseError 解析错误
AuthenticationFailed 认证失败
NotAuthenticated 尚未认证
PermissionDenied 权限决绝
NotFound 未找到
MethodNotAllowed 请求方式不支持
NotAcceptable 要获取的数据格式不支持
Throttled 超过限流次数
ValidationError 校验失败