장고 DRF #2 | Django REST framework Requests and Responses

Django REST framework 
Requests and Responses

Request objects

• request.POST
  • handles from data. 
• request.data
  • handles arbitrary data

Response objects

• return Response(data)
  • renders to content type

Status codes

• HTTP 상태 코드를 숫자로 표현하기보다는 HTTP_400_BAD_REQUEST 식별자를 사용하는 편이 좋다. 

Wrapping API views

REST 프레임워크에서 API뷰를 작성하는 두 개의 래퍼가 있다. 

• @api_view
  • 함수 기반 뷰로 작업하기 위한 데코레이터
• APIView
  • 클래스 기반 뷰로 작업하기 위한 클래스
• 래퍼는 입력이 잘못되었을 경우 예외 처리 등을 해준다. 

Pulling it all together

from urllib import response
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):
    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):
    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)

이제 더이상 반환 객체를 구체적으로 정의해주지 않고, 

Response만 해준다. 

 

Adding optional format suffixes to our 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)