10.APIView视图

from rest_framework import status
from rest_framework.response import Response
from snippets.models import Snippet
from snippets.serializers import SnippetSerizlizer
from rest_framework.decorators import APIView  # 导入APIView
from django.http.response import Http404


# 定义 类视图 继承APIView
# 内部定义对应的请求方法，会根据前端的请求类型做不同的操作
class SnippetList(APIView):
    # 定义get方法
    def get(self, request, format=None):
        snippets = Snippet.objects.all()
        serializer = SnippetSerizlizer(snippets, many=True)
        return Response(serializer.data)

    # 定义post方法
    def post(self, request, format=None):
        serializer = SnippetSerizlizer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


class SnippetDEtail(APIView):
    def get_object(self, pk):
        try:
            snippet = Snippet.objects.get(pk=pk)
            return snippet
        except Snippet.DoesNotExist:  # 如果查询不到传入的pk字段，则执行以下代码

            return Http404

    def get(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerizlizer(snippet)
        return Response(serializer.data)

    # 定义put方法
    def put(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerizlizer(snippet, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    # 定义删除方法
    def delete(self, request, pk, format=None):
        snippet = self.get_object(pk)
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

urlpatterns = [
    path('snippets/',views.SnippetList.as_view()),
    path('snippets/<int:pk>/',views.SnippetDEtail.as_view())
]