urls.py
url(r‘^(?P<version>[v1|v2]+)/roles/$‘, views.RolesView.as_view()),
views.py
from  rest_framework import serializers
class RolesSerializers(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField()
class RolesView(APIView):
    def get(self, request, *args, **kwargs):
        roles = models.Role.objects.all().first()
        ser = RolesSerializers(instance=roles, many=False)
        # ser.data 已经是转换完成的结果
        ret = json.dumps(ser.data, ensure_ascii=False)
        # {"id": 1, "title": "医生"}
        return HttpResponse(ret)

url(r‘^(?P<version>[v1|v2]+)/group(?P<pk>\d+)/$‘, views.GroupView.as_view(),name=‘gp‘),
from  rest_framework import serializers
# class UserInfoSerializers(serializers.Serializer):
class UserInfoSerializers(serializers.ModelSerializer):
    # 根据分组id反向生产url
    group = serializers.HyperlinkedIdentityField(view_name=‘gp‘,lookup_field=‘group_id‘,lookup_url_kwarg=‘pk‘)
    class Meta:
        model = models.UserInfo
        fields = [‘id‘,‘username‘,‘password‘,‘group‘]
        depth = 1  # 1取中文 0取id  0 ~ 10
 
class UserinfoView(APIView):
    def get(self, request, *args, **kwargs):
        users = models.UserInfo.objects.all()
        # 1.实例化，一般是将数据封装到对象:__new__,__init__
        # 一个对象， Serializer类处理； self.to_representation
        # QuerySet集合，ListSerializer类处理； self.to_representation
        set = UserInfoSerializers(instance=users, many=True,context={‘request‘: request})
        set.data
        ret = json.dumps(set.data, ensure_ascii=False)
        return HttpResponse(ret)
# 序列化数据分组
class GroupSerializers(serializers.ModelSerializer):
    class Meta:
        model = models.UserGroup
        fields = "__all__"
 
# 把id换成路由。
class GroupView(APIView):
    def get(self, request, *args, **kwargs):
        pk = kwargs.get(‘pk‘)
        obj = models.UserGroup.objects.filter(pk=pk).first()
        ser = GroupSerializers(instance=obj,many=False)  # 单个对象
        ret = json.dumps(ser.data,ensure_ascii=False)  # 中文
        return HttpResponse(ret)

from  rest_framework import serializers
# class UserInfoSerializers(serializers.Serializer):
class UserInfoSerializers(serializers.ModelSerializer):
    # 根据分组id反向生产url
    group = serializers.HyperlinkedIdentityField(view_name=‘gp‘,lookup_field=‘group_id‘,lookup_url_kwarg=‘pk‘)
    class Meta:
        model = models.UserInfo
        fields = [‘id‘,‘username‘,‘password‘,‘group‘]
        depth = 1  # 1取中文 0取id  0 ~ 10
 
class UserinfoView(APIView):
    def get(self, request, *args, **kwargs):
        users = models.UserInfo.objects.all()
        # 1.实例化，一般是将数据封装到对象:__new__,__init__
        set = UserInfoSerializers(instance=users, many=True,context={‘request‘: request})
        ret = json.dumps(set.data, ensure_ascii=False)
        return HttpResponse(ret)

############################ 验证##########################
# 自定义验证规则
class xxxValidator(object):
    def __init__(self, base):
        self.base = base
    def __call__(self, value): # 数据一提交 就会执行__call__方法。
        if not value.startswith(self.base):
            message = ‘标题必须以 %s开头！‘ % self.base
            raise serializers.ValidationError(message)
    def set_context(self, serializer_field):
        # 执行验证之前调用,serializer_fields是当前字段对象
        pass
 
 
# 序列化数据
class UsergroupSerializers(serializers.Serializer):
    # title = serializers.CharField(error_messages={‘required‘:‘标题不能为空！‘})
    # 写的标题必须也什么开头。
    title = serializers.CharField(error_messages={‘required‘:‘标题不能为空！‘},validators=[xxxValidator(‘老男人‘),])
# 验证用户请求数据
class UsergroupView(APIView):
    def post(self, request, *args, **kwargs):
        ser = UsergroupSerializers(data=request.data)
        if ser.is_valid():
            print(ser.validated_data[‘title‘])
        else:
            print(ser.errors)
        return HttpResponse(‘提交数据‘)

 序列化：
            部分总结：
                1. 写类
                    class RolesSerializer(serializers.Serializer):
                        id = serializers.IntegerField()
                        title = serializers.CharField()
            
                    class UserInfoSerializer(serializers.ModelSerializer):
                        class Meta:
                            model = models.UserInfo
                            # fields = "__all__"
                            fields = [‘id‘,‘username‘,‘password‘,]
            
                2. 字段 
                    a. title = serializers.CharField(source="xxx.xxx.xx.xx")
                    b. title = serializers.SerializerMethodField()
                       class UserInfoSerializer(serializers.ModelSerializer):
                            rls = serializers.SerializerMethodField()  # 自定义显示
 
                            class Meta:
                                model = models.UserInfo
                                fields = [‘id‘,‘username‘,‘password‘,‘rls‘,]
                            
                            # 自定义方法
                            def get_rls(self, row):
                                role_obj_list = row.roles.all()
                                ret = []
                                for item in role_obj_list:
                                    ret.append({‘id‘:item.id,‘title‘:item.title})
                                return ret
                    c. 自定义类
                        fields = [‘id‘,‘username‘,‘password‘,‘group‘]
                        depth = 1  # 1取中文 0取id  0 ~ 10
 
                        
                3. 自动序列化连表
                    class UserInfoSerializer(serializers.ModelSerializer):
                    class Meta:
                        model = models.UserInfo
                        # fields = "__all__"
                        fields = [‘id‘,‘username‘,‘password‘,‘group‘,‘roles‘]
                        depth = 1 # 0 ~ 10
            
                4. 生成链接
                    class UserInfoSerializer(serializers.ModelSerializer):
                        group = serializers.HyperlinkedIdentityField(view_name=‘gp‘,lookup_field=‘group_id‘,lookup_url_kwarg=‘xxx‘)
                        class Meta:
                            model = models.UserInfo
                            # fields = "__all__"
                            fields = [‘id‘,‘username‘,‘password‘,‘group‘,‘roles‘]
                            depth = 0 # 0 ~ 10
 
                    class UserInfoView(APIView):
                        def get(self,request,*args,**kwargs):
                            users = models.UserInfo.objects.all()
                            ser = UserInfoSerializer(instance=users,many=True,context={‘request‘: request})
                            ret = json.dumps(ser.data, ensure_ascii=False)
                            return HttpResponse(ret)
            源码：
                一个对象， Serializer类处理；
                QuerySet集合，ListSerializer类处理；
                # ser.data
                
        请求数据校验：
                            
                class XXValidator(object):
                    def __init__(self, base):
                        self.base = base
                    def __call__(self, value):
                        if not value.startswith(self.base):
                            message = ‘标题必须以 %s 为开头。‘ % self.base
                            raise serializers.ValidationError(message)
                    def set_context(self, serializer_field):
                        """
                        This hook is called by the serializer instance,
                        prior to the validation call being made.
                        """
                        # 执行验证之前调用,serializer_fields是当前字段对象
                        pass
 
                class UserGroupSerializer(serializers.Serializer):
                    title = serializers.CharField(error_messages={‘required‘:‘标题不能为空‘},validators=[XXValidator(‘老男人‘),])
                class UserGroupView(APIView):
                    def post(self,request,*args,**kwargs):
                        ser = UserGroupSerializer(data=request.data)
                        if ser.is_valid():
                            print(ser.validated_data[‘title‘])
                        else:
                            print(ser.errors)
                        return HttpResponse(‘提交数据‘)