title: Django Rest Framework object is not iterable?
body: <p>I have serialised one of my models that has a foreign key in. I get <code>'Parent' object is not iterable</code></p>
  
  <p>models.py</p>
  
  <pre><code>class Parent(models.Model):
      # Parent data
  
  class Child(models.Model):
      parent = ForeignKey(Parent)
  </code></pre>
  
  <p>serializer.py</p>
  
  <pre><code>class ChildSerializers(serializers.ModelSerializer):
      parent = serializers.RelatedField(many=True)
      class Meta:
          model = ReportField
          fields = (
              'id',
              'parent'
          )
  </code></pre>
  
  <p>api.py</p>
  
  <pre><code>class ChildList(APIView):
      def get(self, request, format=None):
          child = Child.objects.all()
          serialized_child = ChildSerializers(child, many=True)
          return Response(serialized_child.data)
  </code></pre>
  
  <p>Im guessing i have to pass the parent list to the child list but not sure of the best way to do it</p>
  
  <p>attempt api.py</p>
  
  <pre><code>class ChildList(APIView):
      def get(self, request, format=None):
          child = Child.objects.all()
          parent = Parent.objects.all()
          serialized_child = ChildSerializers(child, many=True)
          serialized_parent = ChildSerializers(parent, many=True)
          return Response(serialized_child.data, serialized_parent.data)
  </code></pre>