如何在Django REST框架中实现资源层次结构(例如/parents/<id>/子)

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在Django REST Framework网站上,我在教程中找不到关于如何实现这一目标的任何信息,而且我也没有在文档中找到它,尽管我确信它就在某个地方。

我想issues作为父资源pages做孩子们/issues/1/pages返回所有页面issue_id其中1人。

是否有一种使用基于泛型类的视图来实现这一目标的好方法?

到目前为止我的情况是这样的。

RESTAPI/urls.py:

from django.conf.urls import patterns, url
from rest_framework.urlpatterns import format_suffix_patterns
from restAPI import views

urlpatterns = patterns('',
    url(r'^issues/$', views.IssueList.as_view()),
    url(r'^issues/(?P<pk>[0-9]+)/$', views.IssueDetail.as_view()),


    url(r'^issues/(?P<issue_id>[0-9]+)/pages/$', views.PageList.as_view()),    
    url(r'^pages/(?P<pk>[0-9]+)/$', views.PageDetail.as_view()),
)

urlpatterns = format_suffix_patterns(urlpatterns)

RESTAPI/Models.py:

from django.db import models

class Issue(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    revision = models.IntegerField(default = 1)
    issue_date = models.DateTimeField(auto_now_add=True)
    issue_image_url = models.CharField(max_length=100)

class Page(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    page_number = models.IntegerField()
    standard_page_url = models.CharField(max_length=100, default='')
    large_page_url = models.CharField(max_length=100, default='')
    thumbnail_url = models.CharField(max_length=100, default='')

    issue = models.ForeignKey(Issue, related_name="pages")

    class Meta:
        ordering = ('page_number',)

RESTAPI/erializers.py:

from rest_framework import serializers
from restAPI.models import Page, Issue

class IssueSerializer(serializers.ModelSerializer):
    class Meta:
        model = Issue
        fields = ('id', 'created', 'revision', 'issue_date', 'issue_image_url')

class PageSerializer(serializers.ModelSerializer):       
    class Meta:
        model = Page
        fields = ('id', 'created', 'page_number', 'standard_page_url', 'large_page_url', 'thumbnail_url')

RESTAPI/views.py:

from restAPI.models import Page, Issue
from restAPI.serializers import PageSerializer, IssueSerializer
from rest_framework import mixins
from rest_framework import generics

class IssueList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Issue.objects.all()
    serializer_class = IssueSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

class IssueDetail(mixins.RetrieveModelMixin,
                    mixins.UpdateModelMixin,
                    mixins.DestroyModelMixin,
                    generics.GenericAPIView):
    queryset = Issue.objects.all()
    serializer_class = IssueSerializer

    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)  

class PageList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Page.objects.all()
    serializer_class = PageSerializer

    def get(self, request, *args, **kwargs):
        print kwargs
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

class PageDetail(mixins.RetrieveModelMixin,
                   mixins.UpdateModelMixin,
                   mixins.DestroyModelMixin,
                   generics.GenericAPIView):
    queryset = Page.objects.all()
    serializer_class = PageSerializer

    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

我如何实现这种关系issuespages?

提问于
用户回答回答于

这是我做过的另一种方法:

views.py

from models import Customer, Order
from serializers import CustomerSerializer, OrderSerializer

from rest_framework import generics

class CustomerList(generics.ListCreateAPIView):
    queryset = Customer.objects.all()
    serializer_class = CustomerSerializer

class CustomerDetail(generics.RetrieveUpdateDestroyAPIView)
    queryset = Customer.objects.all()
    serializer_class = CustomerSerializer

class OrdersByCustomer(generics.ListCreateAPIView):
    queryset = Order.objects.all()
    serializer_class = OrderSerializer

    def get_queryset(self):
        customer_pk = self.kwargs['customer_pk']
        return self.queryset.filter(customer__pk=customer_pk)

    def pre_save(self, obj):
        obj.customer_id = self.kwargs['customer_pk'] 

class OrderDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Order.objects.all()
    serializer_class = OrderSerializer

串行化

from models import Customer, Order

from rest_framework import serializers
from rest_framework.reverse import reverse

class OrderSerializer(serializers.HyperlinkedModelSerializer)

    class Meta:
        model = Order

class CustomerSerializer(serializers.HyperlinkedModelSerializer)

    orders = serializers.SerializerMethodField('get_customer_orders')

    def get_customer_orders(self, obj):
        return reverse('ordersbycustomer-list', 
               args=[obj.pk], request=self.context['request'])

    class Meta:
        model = Customer

urls.py

from django.conf.urls import patterns, include, url
from views import OrdersByCustomer, CustomerDetail, CustomerList

urlpatterns = patterns("",
    url(r'^customers/(?P<customer_pk>.+)/orders/$', OrdersByCustomer.as_view(), name='ordersbycustomer-list'),
    url(r'^customers/(?P<pk>.+)/$', CustomerDetail.as_view(), name='customer-detail'),
    url(r'^customers/$', CustomerList.as_view(), name='customer-list'),
    )

涉及的代码比Viewset/路由器所涉及的代码多,但这能够更好地控制正在发生的事情。

用户回答回答于

来自REST-框架版本2.3:

views.py:

from rest_framework import viewsets
from rest_framework.response import Response
from models import Order, OrderLine
from serializers import OrderSerializer, OrderLineSerializer

class OrderViewSet(viewsets.ModelViewSet):
    queryset = Order.objects.all()
    serializer_class = OrderSerializer

    @link()
    def lines(self, request, pk=None):
        queryset = OrderLine.objects.filter(order__pk=pk)
        serializer = OrderLineSerializer(queryset,
                           context={'request':request},
                           many=True)
        return Response(serializer.data)

class OrderLineViewSet(viewsets.ModelViewSet):
    queryset = OrderLine.objects.all()
    serializer_class = OrderLineSerializer

串行化

from rest_framework import serializers
from models import Order, OrderLine

class OrderSerializer(serializers.HyperlinkedModelSerializer):
    lines = serializers.HyperlinkedIdentityField(view_name='order-lines')

    class Meta:
        model = Order


class OrderLineSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:
        model = OrderLine

urls.py

from views import OrderViewSet, OrderLineViewSet
from rest_framework.routers import DefaultRouter

router = DefaultRouter()
router.register(r'order', OrderViewSet)
router.register(r'orderline', OrderLineViewSet)
urlpatterns = router.urls

现在,‘order/id/lines’将返回与该id标识的顺序有关系的序列化命令行列表。

在使用@link或@action修饰的ViewSet上的任何方法在向路由器注册视图时都将获得URL。

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