在restful规范中要去，后端的API中需要体现版本。
drf框架中支持5种版本的设置。这里只介绍常用的2种。

URL的GET参数传递

[http://127.0.0.1:8000/users/?version=v1](http://127.0.0.1:8000/users/?version=v1)
QueryParameterVersioning

# app01/views.py
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.versioning import QueryParameterVersioning
# Create your views here.
class UserView(APIView):
    versioning_class = QueryParameterVersioning
    def get(self, request, *args, **kwargs):
        print(request.version)
        return Response({"code": 1000, "data": "xxx"})
    def post(self, request, *args, **kwargs):
        return Response({"code": 1000, "data": "xxx"})

全局设置

# settings.py
REST_FRAMEWORK = {
    "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.QueryParameterVersioning"
}

# app01/views.py
from rest_framework.views import APIView
from rest_framework.response import Response
# Create your views here.
class UserView(APIView):
    def get(self, request, *args, **kwargs):
        print(request.version)
        return Response({"code": 1000, "data": "xxx"})
    def post(self, request, *args, **kwargs):
        return Response({"code": 1000, "data": "xxx"})

其它设置

http://127.0.0.1:8000/users/?v=v1

# settings.py
REST_FRAMEWORK = {
    "VERSION_PARAM": "v",   # 参数名：默认为version(这里改为v)
    "DEFAULT_VERSION": "v1", # 参数值：默认为v1
    "ALLOWED_VERSIONS": ["v1", "v2", "v3"],  # # 参数限制
    "DEFAULT_VERSIONING_CLASS":"rest_framework.versioning.QueryParameterVersioning"
}

# app01/views.py
print(request.v)

源码执行流程

URL路径传递

URLPathVersioning

# drf/urls.py
urlpatterns = [
    path('admin/', admin.site.urls),
    path('api/<version>/users/', views.UserView.as_view()),
]

# app01/views.py
from rest_framework.response import Response
from rest_framework.versioning import URLPathVersioning
# Create your views here.
class UserView(APIView):
    versioning_class = URLPathVersioning
    def get(self, request, *args, **kwargs):
        print(request.version)
        return Response({"code": 1000, "data": "xxx"})
    def post(self, request, *args, **kwargs):
        return Response({"code": 1000, "data": "xxx"})

全局设置

# settings.py
REST_FRAMEWORK = {
    "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.QueryParameterVersioning"
}

其它设置

http://127.0.0.1:8000/api/v1/users/

REST_FRAMEWORK = {
    "VERSION_PARAM": "v",   # 这里要和路径中的名字一致， path('api/<v>/users/', views.UserView.as_view()),
    "DEFAULT_VERSION": "1",
    "ALLOWED_VERSIONS": ["v1", "v2", "v3"],
    "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.URLPathVersioning"
}

# app01/views.py
print(request.version)  # 必须是request.version

反向生成URL

使用的较少，作为了解

# app01/views.py
from rest_framework.views import APIView
from rest_framework.response import Response
# Create your views here.
class UserView(APIView):
    def get(self, request, *args, **kwargs):
        print(request.version)
        url1 = request.versioning_scheme.reverse('u1', args=args, request=request)
        print(url1)  # http://127.0.0.1:8000/api/v1/users/
        url2 = request.versioning_scheme.reverse('u2', kwargs=kwargs, request=request)
        print(url2)  # http://127.0.0.1:8000/api/v1/users/2
        return Response({"code": 1000, "data": "xxx"})
    def post(self, request, *args, **kwargs):
        return Response({"code": 1000, "data": "xxx"})