from rest_framework.generics import GenericAPIView
from .models import Student,TeacherClass,Teacher,Class
from .serializers import SerializerStudent
from rest_framework.response import Response
from rest_framework.status import HTTP_200_OK
class StudentGenericView(GenericAPIView):
queryset = Student.objects.filter(is_delete=False).all()
serializer_class = SerializerStudent
def get(self,request,pk):
if pk :
student=self.get_object() # one row
serializer=SerializerStudent(instance=student)
return Response(data=serializer.data,status=HTTP_200_OK)
else:
students=self.get_queryset() # all rows
serializer=SerializerStudent(instance=students,many=True)
return Response(data=serializer.data,status=HTTP_200_OK)
def post(self,request,*args,**kwargs):
serializer=SerializerStudent(data=request.data)
if serializer.is_valid():
serializer.save()
data,status=serializer.data,200
else:
data,status=serializer.errors,400
return Response(data=data,status=status)
def put(self,request,pk):
student=self.get_object()
serializer=SerializerStudent(instance=student,data=request.data)
if serializer.is_valid():
serializer.save()
data=serializer.data
else:
data=serializer.errors
return Response(data=data, status=HTTP_200_OK)
def delete(self,request,pk):
if pk :
instance=self.get_object()
instance.is_delete=True
instance.save()
serializer=SerializerStudent(instance=instance)
return Response(data=serializer.data)
以上是基于GenericView实现增删改查，实现是单个查询借助self.get_object()以及路由pk进行查询，批量所有数据集合借助queryset,序列化器借助serializer_class
源码解析：
class GenericAPIView(views.APIView):
"""
Base class for all other generic views.它是其他所有generic的视图的基类视图，提供了self.get_serializer_class 方法，self.get_object方法
其次继承了Apiview,dispatch inital 方法
"""
# You'll need to either set these attributes,
# or override `get_queryset()`/`get_serializer_class()`.
# If you are overriding a view method, it is important that you call
# `get_queryset()` instead of accessing the `queryset` property directly,
# as `queryset` will get evaluated only once, and those results are cached
# for all subsequent requests.
queryset = None
serializer_class = None
# If you want to use object lookups other than pk, set 'lookup_field'.
# For more complex lookup requirements override `get_object()`.
lookup_field = 'pk'
lookup_url_kwarg = None
# The filter backend classes to use for queryset filtering
filter_backends = api_settings.DEFAULT_FILTER_BACKENDS
# The style to use for queryset pagination.
pagination_class = api_settings.DEFAULT_PAGINATION_CLASS
generic 视图方法包括以下几个
mixmin里面实现了几个重要mixmin类基于list,update,destroy,create 方法：
在五个基本的generic 视图类身上又进一步多继承实现了更加简单丰富的类方法：
modelviewset:
from rest_framework.viewsets import ViewSet,GenericViewSet,ModelViewSet
源码解读：
url.py
urlpatterns = [
url(r'^student/$',model_view.StudentModelView.as_view({"get":"list","post":"create"})),
url(r'^student/(?P<pk>.*)$', model_view.StudentModelView.as_view({"get": "retrieve",
"put": "update","delete":"destroy"})),
]
Response 代码解读：
第一步调用get_objectc查询对象：
第二步：没找到就报Http404
