Nested tuples serialisation test

djangorestframework/tests/resources.py

@@ -2,6 +2,8 @@
 from django.test import TestCase
 from djangorestframework.resources import _object_to_data
 
+from django.db import models
+
 import datetime
 import decimal
 
@@ -29,3 +31,30 @@ class TestObjectToData(TestCase):
         """datetime objects are left as-is."""
         now = datetime.datetime.now()
         self.assertEquals(_object_to_data(now), now)
+    
+    def test_tuples(self):
+        """ Test tuple serialisation """
+        class M1(models.Model):
+            field1 = models.CharField()
+            field2 = models.CharField()
+        
+        class M2(models.Model):
+            field = models.OneToOneField(M1)
+        
+        class M3(models.Model):
+            field = models.ForeignKey(M1)
+        
+        m1 = M1(field1='foo', field2='bar')
+        m2 = M2(field=m1)
+        m3 = M3(field=m1)
+        
+        Resource = type('Resource', (object,), {'fields':(), 'include':(), 'exclude':()})
+        
+        r = Resource()
+        r.fields = (('field', ('field1')),)
+
+        self.assertEqual(_object_to_data(m2, r), dict(field=dict(field1=u'foo')))
+        
+        r.fields = (('field', ('field2')),)
+        self.assertEqual(_object_to_data(m3, r), dict(field=dict(field2=u'bar')))
+