让我们看看通过 Serializer 类怎样来编写 API 的视图函数，现在我们不会使用 REST 框架中的特性，仅仅写原生的Django视图函数。
一.我们创建一个 HttpResponse 的子类，用来将任何数据转换成 JSON格式.
编辑snippets/views.py，如下：
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from django.http import HttpResponse
from django.views.decorators.csrf import csrf_exempt
from rest_framework.renderers import JSONRenderer
from rest_framework.parsers import JSONParser
from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
class JSONResponse(HttpResponse):
"""
An HttpResponse that renders its content into JSON.
"""
def __init__(self, data,**kwargs):
content =JSONRenderer().render(data)
kwargs['content_type']='application/json'
super(JSONResponse, self).__init__(content,**kwargs)
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二.我们API的目的是，可以通过view来列举全部的Snippet的内容，或者创建一个新的snippet
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@csrf_exemptdef snippet_list(request):
"""
List all code snippets, or create a new snippet.
"""
if request.method =='GET':
snippets =Snippet.objects.all()
serializer =SnippetSerializer(snippets,many=True)
return JSONResponse(serializer.data)
elif request.method =='POST':
data =JSONParser().parse(request)
serializer =SnippetSerializer(data=data)
if serializer.is_valid():
serializer.save()
return JSONResponse(serializer.data, status=201)
return JSONResponse(serializer.errors, status=400)
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注意，因为我们要通过client向该view post一个请求，所以我们要将该view 标注为csrf_exempt, 以说明不是一个CSRF事件。它不同于以往的正常的视图函数，REST框架的视图函数事实上使用更加敏感的行为，它现在只是为了达到我们的目的。
三.我们还要一个视图函数来为单独的 snipet 实例服务，用来恢复，更新和删除 snippet
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@csrf_exemptdef snippet_detail(request, pk):
"""
Retrieve, update or delete a code snippet.
"""
try:
snippet =Snippet.objects.get(pk=pk)
except Snippet.DoesNotExist:
return HttpResponse(status=404)
if request.method =='GET':
serializer = SnippetSerializer(snippet)
return JSONResponse(serializer.data)
elif request.method =='PUT':
data =JSONParser().parse(request)
serializer =SnippetSerializer(snippet, data=data)
if serializer.is_valid():
serializer.save()
return JSONResponse(serializer.data)
return JSONResponse(serializer.errors, status=400)
elif request.method =='DELETE':
snippet.delete()
return HttpResponse(status=204)
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四.将views.py保存，在Snippets目录下面创建urls.py，添加以下内容：
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from django.conf.urls import patterns, url
urlpatterns = patterns('snippets.views',
url(r'^snippets/$','snippet_list'),
url(r'^snippets/(?P<pk>[0-9]+)/$','snippet_detail'),
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四.测试
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python manage.py runserver |
在另外的终端中:
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curl http://127.0.0.1:8000/snippets/[{"id": 1, "title": "", "code": "foo = \"bar\"\n", "linenos": false, "language": "python", "style":
"friendly"}, {"id": 2, "title": "", "code": "print \"hello, world\"\n", "linenos": false, "language":
"python", "style": "friendly"}]
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本文转自 luoguo 51CTO博客，原文链接:http://blog.51cto.com/luoguoling/1688166