drf_关系和超链接API

1、创建根节点，在snippets/views.py中添加：reverse可以反射url地址

from rest_framework.decorators import api_view
from rest_framework.response import Response
from rest_framework.reverse import reverse


@api_view(['GET'])
def api_root(request, format=None):
    return Response({
        'users': reverse('user-list', request=request, format=format),
        'snippets': reverse('snippet-list', request=request, format=format)
    })

2、为突出显示的代码创建连接

from rest_framework import renderers
from rest_framework.response import Response

class SnippetHighlight(generics.GenericAPIView):
    queryset = Snippet.objects.all()
    renderer_classes = (renderers.StaticHTMLRenderer,)

    def get(self, request, *args, **kwargs):
        snippet = self.get_object()
        return Response(snippet.highlighted)

3、在url中添加对应的view

url(r'^$', views.api_root),
url(r'^snippets/(?P<pk>[0-9]+)/highlight/$', views.SnippetHighlight.as_view()),

4、使用超链接API,使用HyperlinkedModelSerializer而不是现有的ModelSerializer，修改serializers.py

class SnippetSerializer(serializers.HyperlinkedModelSerializer):
    owner = serializers.ReadOnlyField(source='owner.username')
    highlight = serializers.HyperlinkedIdentityField(view_name='snippet-highlight', format='html')

    class Meta:
        model = Snippet
        fields = ('url', 'id', 'highlight', 'owner',
                  'title', 'code', 'linenos', 'language', 'style')


class UserSerializer(serializers.HyperlinkedModelSerializer):
    snippets = serializers.HyperlinkedRelatedField(many=True, view_name='snippet-detail', read_only=True)

    class Meta:
        model = User
        fields = ('url', 'id', 'username', 'snippets')

highlight 和url字段都是使用超链接形式。

5、命名url

from django.conf.urls import url, include
from rest_framework.urlpatterns import format_suffix_patterns
from snippets import views

# API endpoints
urlpatterns = format_suffix_patterns([
    url(r'^$', views.api_root),
    url(r'^snippets/$',
        views.SnippetList.as_view(),
        name='snippet-list'),
    url(r'^snippets/(?P<pk>[0-9]+)/$',
        views.SnippetDetail.as_view(),
        name='snippet-detail'),
    url(r'^snippets/(?P<pk>[0-9]+)/highlight/$',
        views.SnippetHighlight.as_view(),
        name='snippet-highlight'),
    url(r'^users/$',
        views.UserList.as_view(),
        name='user-list'),
    url(r'^users/(?P<pk>[0-9]+)/$',
        views.UserDetail.as_view(),
        name='user-detail')
])

6、分页

在setting.py中：确定每页显示的条数。

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 10
}