-drf版本控制

　　-在setting中配置

	'DEFAULT_VERSION': 'v1',  # 默认版本(从request对象里取不到，显示的默认值)

	'ALLOWED_VERSIONS': ['v1', 'v2'],  # 允许的版本

	'VERSION_PARAM': 'version'  # URL中获取值的key

　　-局部使用

	versioning_class = URLPathVersioning

　　-全局使用

	'DEFAULT_VERSIONING_CLASS':'rest_framework.versioning.URLPathVersioning',

#在CBV类中加入

versioning_class = URLPathVersioning

REST_FRAMEWORK = {

    'DEFAULT_VERSIONING_CLASS':'rest_framework.versioning.QueryParameterVersioning',

    'DEFAULT_VERSION': 'v1',            # 默认版本(从request对象里取不到，显示的默认值)

    'ALLOWED_VERSIONS': ['v1', 'v2'],   # 允许的版本

    'VERSION_PARAM': 'version'          # URL中获取值的key

}

from django.conf.urls import url, include

from web.views import TestView

urlpatterns = [

    url(r'^(?P<version>[v1|v2]+)/test/', TestView.as_view(), name='test'),

]

from rest_framework.views import APIView

from rest_framework.response import Response

from rest_framework.versioning import URLPathVersioning

class TestView(APIView):

    versioning_class = URLPathVersioning

    def get(self, request, *args, **kwargs):

        # 获取版本

        print(request.version)

        # 获取版本管理的类

        print(request.versioning_scheme)

        # 反向生成URL

        reverse_url = request.versioning_scheme.reverse('test', request=request)

        print(reverse_url)

        return Response('GET请求，响应内容')

# 基于django内置,反向生成url

from django.urls import reverse

url2=reverse(viewname='ttt',kwargs={'version':'v2'})

print(url2)

#执行determine_version，返回两个值，放到request对象里

version, scheme = self.determine_version(request, *args, **kwargs)

request.version, request.versioning_scheme = version, scheme

def determine_version(self, request, *args, **kwargs):

        #当配置上版本类之后，就会实例化

        if self.versioning_class is None:

            return (None, None)

        scheme = self.versioning_class()

        return (scheme.determine_version(request, *args, **kwargs), scheme)