django-rest-framework(DRF)阅读笔记2

1.Wrapping API views
    1.1 @api_view 用于处理基于函数的视图.
    1.2    APIView 用于处理基于类的视图.
2.简化上一章中的views.py，这里我们不在使用JSONParser
"""
为了利用响应不再硬连接到单一内容类型这一事实，
让我们向API端点添加对格式后缀的支持。使用格式后缀可以提供显式引用给定格式的url，
这意味着我们的API将能够处理url，比如http://example.com/api/items/4.json。
首先向这两个视图添加一个format关键字参数，就像这样
"""
from rest_framework import status
from rest_framework.decorators import api_view
from rest_framework.response import Response
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer


@api_view(['GET', 'POST'])
def snippet_list(request, format=None):
    """
    List all code snippets, or create a new snippet.
    """
    if request.method == 'GET':
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    elif request.method == 'POST':
        serializer = SnippetSerializer(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)

        

@api_view(['GET', 'PUT', 'DELETE'])
def snippet_detail(request, pk, request=None):
    """
    Retrieve, update or delete a code snippet.
    """
    try:
        snippet = Snippet.objects.get(pk=pk)
    except Snippet.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)

    if request.method == 'GET':
        serializer = SnippetSerializer(snippet)
        return Response(serializer.data)

    elif request.method == 'PUT':
        serializer = SnippetSerializer(snippet, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    elif request.method == 'DELETE':
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)    

3.更新urls
from django.urls import path
from rest_framework.urlpatterns import format_suffix_patterns
from snippets import views

urlpatterns = [
    path('snippets/', views.snippet_list),
    path('snippets/<int:pk>', views.snippet_detail),
]

urlpatterns = format_suffix_patterns(urlpatterns)