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[英]Django Rest Framework: Serializing a model and grouping by a foreign key for other data
[英]Using Django REST Framework API for data model with composite key
當數據模型具有包含兩個字段的組合鍵時,如何使用Django Rest Framework創建API? 背景:我正在嘗試為數據模型制作REST api(下面的示例數據行-前兩個條目構成復合鍵)。 我可以使用date字段調用數據,但是在嘗試使用第二個字符串字段返回單個記錄時遇到錯誤。
'2015年5月6日', 'INTC', '31.93', '32.79', '32.50', '32.22', '31737537'
我正在嘗試使api網址結構如下:
本地主機/ API / V1 / YYYY-MM-DD / '字符'
本地主機/ API / V1 / 2015-05-07 / AAPL
serializers.py
from rest_framework import serializers
from .models import Stocksusa, Optionsusa
from rest_framework.reverse import reverse
class StocksUsaSerializer(serializers.HyperlinkedModelSerializer):
url = serializers.SerializerMethodField('get_stock_usa_url')
def get_stock_usa_url(self, obj):
values = [obj.Trade_Date, obj.Ticker]
composite_key_url = "http://0.0.0.0:9978/api/v1/stocksusa/{}/{}".format(*values)
return composite_key_url
class Meta:
model = Stocksusa
fields = ('Trade_Date', 'Ticker', 'PxMin', 'PxMax', 'PxOpen', 'PxClose', 'Volume', 'url')
views.py
from django.shortcuts import render
from rest_framework import authentication, permissions, viewsets, filters
from .models import Stocksusa
from .serializers import StocksUsaSerializer
from django.contrib.auth import get_user_model
User = get_user_model()
class DefaultsMixin(object):
authentication_classes = (
authentication.BasicAuthentication,
authentication.TokenAuthentication,
)
permission_classes = (
permissions.IsAuthenticated,
)
paginate_by = 25
paginate_by_param = 'page_size'
max_paginate_by = 100
filter_backends = (
filters.DjangoFilterBackend,
filters.SearchFilter,
filters.OrderingFilter,
)
class StocksUsaViewSet(DefaultsMixin, viewsets.ReadOnlyModelViewSet):
queryset = Stocksusa.objects.all()
serializer_class = StocksUsaSerializer
應用程序/ urls.py
from rest_framework.routers import DefaultRouter
from . import views
router = DefaultRouter(trailing_slash=False)
router = DefaultRouter()
router.register(r'stocksusa', views.StocksUsaViewSet)
urls.py
from django.conf.urls import patterns, include, url
from django.contrib import admin
from django.conf.urls import include, url
from rest_framework.authtoken.views import obtain_auth_token
from FinDataUsa.urls import router
from FinDataUsa.views import StocksUsaViewSet as stockview
urlpatterns = patterns('',
url(r'^api/token/', obtain_auth_token, name='api-token'),
url(r'^api/v1/', include(router.urls)),
url(r'^api/v2/', include(router.urls)),
url(r'^admin/', include(admin.site.urls)),
url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
url(r'^docs/', include('rest_framework_swagger.urls')),
)
問題在於,DefaultRouter使用模型的id lookup_field獲取所需的對象:例如,這有效:
GET localhost/api/v1/stocksusa/1
為了提供額外的參數,您需要手工制作以下網址:
url(r'(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})/(?P<code>\w+)$',
StocksUsaViewSet.as_view(),
name='stocks_detail'
),
年月日 代碼參數通過kwargs字典傳遞到您的視圖中:
self.kwargs['year']
self.kwargs['month']
self.kwargs['day']
self.kwargs['code']
在get_object方法上,您需要執行以下操作:
def get_object(self, queryset=None):
try:
date= datetime.date(
year=int(self.kwargs['year']),
month=int(self.kwargs['month']),
day=int(self.kwargs['day']),
)
except ValueError:
raise Http404
stock= get_object_or_404(Stocksusa, Ticker=self.kwargs['code'], Trade_Date=date)
return stock
然后,您將可以訪問您的對象:
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