rest_framework五大模块

面向对象封装

面向对象封装导入

# 1.将子类共有的方法抽离形成父类方法
# 2.子类使用共有方法，使用的是父类方法
# 3.共有方法中的资源，在子类使用方法时，获取的是子类资源
class MyClass:
      name = None
      @classmethod
      def test(cls):
            print(cls.name)
class AClass(MyClass):
      name = "AClass"
class BClass(MyClass):
      name = "BClass"
AClass.test()
BClass.test()

面向对象的封装

drf视图层面向对象封装应用

# drf已经做了 CBV的面向对象封装，且还做了一步精髓之笔，重写了as_view()
class GetListClass: pass # get_list
class PostOneClass: pass # post_one
class GetOneCLass: pass # get_one
class PutOneClass: pass # put_one
class DeleteOneClass: pass # delete_one 

# get_list | post_one | get_one | put_one | delete_one
class MyClass(GetListClass,PostOneClass,GetOneCLass,PutOneClass,DeleteOneClass): pass

# get_list | post_one
class Books(GetListClass,PostOneClass): pass
# get_list | post_one | get_one | put_one | delete_one
class BookView(MyClass): pass
# get_list | post_one | get_one | put_one | delete_one
class AuthorView(MyClass): pass

drf视图层面向对象封装

基础的五大接口：基础

数据准备

# settings.py
INSTALLED_APPS=[
  #.....
  'rest_framework',
]

# models.py 手动形成数据
class Book(models.Model):
    name = models.CharField(max_length=32)
    price = models.DecimalField(max_digits=5, decimal_places=2)
    author = models.ManyToManyField(to='Author', db_constraint=False)

class Author(models.Model):
    name = models.CharField(max_length=32)
    author_detail = models.OneToOneField(to='AuthorDetail', on_delete=models.SET_NULL, null=True, db_constraint=False)

class AuthorDetail(models.Model):
    age = models.IntegerField()
    telephone = models.CharField(max_length=32)

# objectjson.py
from rest_framework import serializers
from app import models

class AuthorDetailJson(serializers.ModelSerializer):
    class Meta:
        model = models.AuthorDetail
        fields = '__all__'

class AuthorJson(serializers.ModelSerializer):
    class Meta:
        model = models.Author
        fields = '__all__'

class BookJson(serializers.ModelSerializer):
    class Meta:
        model = models.Book
        fields = '__all__'
# urls.py
from app import views
urlpatterns = [
    url(r'^books/', views.Books.as_view()),
    url(r'^book/(?P<pk>\d+)/', views.Book.as_view()),
]

数据准备

五大接口

from rest_framework.views import APIView
from rest_framework.response import Response
from app import models, objectjson

class Books(APIView):
    # 请求地址：/books/
    def get(self, request, *args, **kwargs):
        book_list = models.Book.objects.all()
        book_data = objectjson.BookJson(book_list, many=True).data
        return Response({
            'status': 0,
            'message': 'ok',
            'results': book_data
        })

    # 请求地址：/books/ 参数：：{"name": "红楼梦","price": "66.66","author": [1]}
    def post(self, request, *args, **kwargs):
        book_json = objectjson.BookJson(data=request.data)
        if book_json.is_valid():
            book_json.save()
            return Response({
                'status': 0,
                'message': 'ok',
                'results': book_json.data
            })

class Book(APIView):
    # 请求地址:/book/1/
    def get(self, request, pk, *args, **kwargs):
        book = models.Book.objects.filter(pk=pk).first()
        book_data = objectjson.BookJson(book).data
        return Response({
            'status': 0,
            'message': 'ok',
            'results': book_data
        })

    # 请求地址：/book/2/ 参数：{"name": "红楼梦","price": "88.88","author": [1]}
    def put(self, request, pk, *args, **kwargs):
        book = models.Book.objects.filter(pk=pk).first()
        book_json = objectjson.BookJson(data=request.data, instance=book)
        if book_json.is_valid():
            book_json.save()
            return Response({
                'status': 0,
                'message': 'ok',
                'results': book_json.data
            })
        return Response({
            'status': 0,
            'message': book_json.errors,
        })

    # 请求地址：/book/2/
    def delete(self, request, pk, *args, **kwargs):
        deleted, _ = models.Book.objects.filter(pk=pk).delete()
        if deleted != 0:
            return Response({
                'status': 2,
                'message': 'delete success'
            })
        return Response({
            'status': 1,
            'message': 'delete failed'
        })

五大接口

五大接口的基础整合：过渡

# views.py
from rest_framework.viewsets import ModelViewSet
from app import models, objectjson

class Books(ModelViewSet):
    queryset = models.Book.objects
    serializer_class = objectjson.BookJson

class Book(ModelViewSet):
    queryset = models.Book.objects
    serializer_class = objectjson.BookJson
    lookup_field = 'pk'
# urls.py
from app import views

urlpatterns = [
    url(r'^books', views.Books.as_view({'get': 'list', 'post': 'create'})),
    url(r'^book/(?P<pk>\d+)/', views.Book.as_view({'get': 'retrieve', 'put': 'update', 'delete': 'destroy'})),
]
# 解读
'''
ModelViewSet继承：五大接口的Mixin,GenericViewSet
         --五大接口的Mixin：
                 -- 分别提供 get_list(list) | post_one(create) | get_one(retrieve) | put_one(update) | delete_one(destroy)
         -- GenericViewSet：
                 -- 继承：ViewSetMixin, generics.GenericAPIView
                         -- ViewSetMixin：重写as_view():解析路由 as_view({'get':'list','post':'create'})
                         -- GenericAPIView:提供基础的 APIView，拥有请求方式
'''

过渡

项目开发基于drf的cbv设计：重点

视图模块

# views.py
from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from app import models, objectjson

# 可以将于Book有关的所有操作函数都放在该CBV中，任何在路由层完成as_view("请求方式":"处理方法")分发
class BookView(ModelViewSet):
    # 如果需要使用基础(没有任何业务逻辑)的五大接口
    queryset = models.Book.objects
    serializer_class = objectjson.BookJson
    lookup_field = 'pk'  # 有名分组key

    # 世纪开发的业务逻辑远远超出五大接口的基础逻辑范围
    # 自定义n个处理数据的函数
    def get_book_by_id(self, request, id, *args, **kwargs):
        book = models.Book.objects.filter(pk=id).first()
        book_data = objectjson.BookJson(book).data
        return Response({
            'status': 0,
            'message': 'ok',
            'results': book_data
        })
# urls.py
urlpatterns = [
    url(r'^book/(?P<id>\d+)/', views.BookView.as_view({'get': 'get_book_by_id'})),
] 

路由模块

from app import views
urlpatterns = [
  # 传统CBV
  url(r'^books/',views.Books.as_view()),
]
urlpatterns = [
  # CBV路由的函数分发
  url(r'^books/',views.BookView.as_view({"get":"get_list"})),
]

解析模块

# views.py
# 解析模块：form-data(MultiPartParser) from-urlencoded(FormParser) json(JSONParser)
from rest_framework.viewsets import ModelViewSet
from rest_framework.parsers import MultiPartParser, FormParser, JSONParser
from rest_framework.response import Response
class TestParser(ModelViewSet):
    # 插拔式：选择性定制解析
    # 配置用户不同方式提交数据，服务器能否提供解析
    parser_classes = [MultiPartParser, FormParser, JSONParser]  # 局部配置即parser_classes=[]在列表中填哪个这个类就解析什么
    def post(self, request, *args, **kwargs):
        return Response({
            'status': 0,
            'message': 'TestParser',
            'results': request.data
        })
 REST_FRAMEWORK = {
    'DEFAULT_PARSER_CLASSES': (
        'rest_framework.parsers.JSONParser',
        'rest_framework.parsers.FormParser',
        'rest_framework.parsers.MultiPartParser'
    )
}
# 注释哪个就在全局不使用哪个上传数据的格式
# urls.py
urlpatterns = [
    url(r'^parsers/', views.TestParser.as_view({'post': 'post'})),
]

响应模块

# views.py
# 相应模块
from rest_framework.viewsets import ModelViewSet
from rest_framework.renderers import JSONRenderer, BrowsableAPIRenderer
from rest_framework.response import Response
class TestParser(ModelViewSet):
    # 插拔式：选择性定制相应模块
    # 配置服务器提供的不同相应数据的方式
    # renderer_classes = [JSONRenderer]# 局部配置需要哪个写哪个
    def get(self, request, *args, **kwargs):
        return Response({
            'status': 0,
            'message': 'TestParser'
        })
# settings.py
# 全局配置
REST_FRAMEWORK = {
            'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
        # 'rest_framework.renderers.BrowsableAPIRenderer',
    )
}
# 当别人在浏览器中访问你的路由，会知道你用了drf模块，在实际开发中一般禁用BrowsableAPIRenderer。
# urls.py
urlpatterns = [
    url(r'^parsers/', views.TestParser.as_view({'get': 'get'})),
]

版本控制模块

基本配置

REST_FRAMEWORK = {
    # 默认版本
    'DEFAULT_VERSION': 'v1',
    # 现存版本
    'ALLOWED_VERSIONS': ['v1', 'v2'],
    # url的参数key
    'VERSION_PARAM': 'version',
}

通过请求参数完成版本配置

# api.site.com/versioning/?version=v1 | api.site.com/versioning/?version=v2
# -- QueryParameterVersioning
# -- url(r'^versioning/',views.TestVersioning.as_view({'get':'get'}))
# -- 请求：/versioning/?version=v1 | /versioning/?version=v1
from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from rest_framework.versioning import QueryParameterVersioning
class TestVersioning(ModelViewSet):
    versioning_class = QueryParameterVersioning

    def get(self, request, *args, **kwargs):
        print(request.version)
        print(request.versioning_scheme)
        if request.version == 'v1':
            print('v1版本的业务逻辑')
        elif request.version == 'v2':
            print('v2版本的业务逻辑')
        return Response({
            'status': 0,
            'message': 'TestVersioning',
            'version': request.version
        })

通过请求url完成版本配置：常用

# api.site.com/v1/versioning/ | api.site.com/v2/versioning/
# -- URLPathVersioning
# -- url(r'^(?P<version>(v1|v2))/versioning/', views.TestVersioning.as_view({'get': 'get'})),
from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from rest_framework.versioning import URLPathVersioning

class TestVersioning(ModelViewSet):
    versioning_class = URLPathVersioning

    def get(self, request, *args, **kwargs):
        print(request.version)
        print(request.versioning_scheme)
        if request.version == 'v1':
            print('v1版本的业务逻辑')
        elif request.version == 'v2':
            print('v2版本的业务逻辑')
        return Response({
            'status': 0,
            'message': 'TestVersioning',
            'version': request.version
        })