Test project

models.py

from django.db import models

class ClassB(models.Model):
    name = models.CharField(max_length=255)

class ClassA(models.Model):
    name = models.CharField(max_length=255)
    childs = models.ManyToManyField(ClassB, blank=True, null=True)

serializers.py

from rest_framework import serializers

from models import ClassA

class ClassASerializer(serializers.ModelSerializer):
    childs = serializers.ManyPrimaryKeyRelatedField()

    class Meta:
        model = ClassA

urls.py

from django.conf.urls import patterns, include, url

from demoapp.views import ObjectList

urlpatterns = patterns('demoapp.views',
    url(r'^$', 'api_root'),
    url(r'^objects/$', ObjectList.as_view(), name='object-list'),
)

views.py

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

from models import ClassA
from serializers import ClassASerializer

@api_view(['GET'])
def api_root(request, format=None):
    return Response({
        'objects': reverse('object-list', request=request)
    })

class ObjectList(generics.ListCreateAPIView):
    """
    List of objects
    """
    model = ClassA
    serializer_class = ClassASerializer