Fix issues with custom pagination serializers

rest_framework/pagination.py

@@ -34,6 +34,17 @@ class PreviousPageField(serializers.Field):
         return replace_query_param(url, self.page_field, page)
 
 
+class DefaultObjectSerializer(serializers.Field):
+    """
+    If no object serializer is specified, then this serializer will be applied
+    as the default.
+    """
+
+    def __init__(self, source=None, context=None):
+        # Note: Swallow context kwarg - only required for eg. ModelSerializer.
+        super(DefaultObjectSerializer, self).__init__(source=source)
+
+
 class PaginationSerializerOptions(serializers.SerializerOptions):
     """
     An object that stores the options that may be provided to a
@@ -44,7 +55,7 @@ class PaginationSerializerOptions(serializers.SerializerOptions):
     def __init__(self, meta):
         super(PaginationSerializerOptions, self).__init__(meta)
         self.object_serializer_class = getattr(meta, 'object_serializer_class',
-                                               serializers.Field)
+                                               DefaultObjectSerializer)
 
 
 class BasePaginationSerializer(serializers.Serializer):
@@ -70,13 +81,6 @@ class BasePaginationSerializer(serializers.Serializer):
 
         self.fields[results_field] = object_serializer(source='object_list', **context_kwarg)
 
-    def to_native(self, obj):
-        """
-        Prevent default behaviour of iterating over elements, and serializing
-        each in turn.
-        """
-        return self.convert_object(obj)
-
 
 class PaginationSerializer(BasePaginationSerializer):
     """

rest_framework/serializers.py

@@ -2,6 +2,7 @@ import copy
 import datetime
 import types
 from decimal import Decimal
+from django.core.paginator import Page
 from django.db import models
 from django.forms import widgets
 from django.utils.datastructures import SortedDict
@@ -273,7 +274,11 @@ class BaseSerializer(Field):
         """
         Serialize objects -> primitives.
         """
-        if hasattr(obj, '__iter__'):
+        # Note: At the moment we have an ugly hack to determine if we should
+        # walk over iterables.  At some point, serializers will require an
+        # explicit `many=True` in order to iterate over a set, and this hack
+        # will disappear.
+        if hasattr(obj, '__iter__') and not isinstance(obj, Page):
             return [self.convert_object(item) for item in obj]
         return self.convert_object(obj)