Fix issue where required fields were not being properly validated. Also make model fields with a default value be not required

docs/topics/rest-hypermedia-hateoas.md

@@ -32,7 +32,7 @@ REST framework also includes [serialization] and [parser]/[renderer] components
 
 ### What REST framework *doesn't* provide.
 
-What REST framework doesn't do is give you is machine readable hypermedia formats such as [Collection+JSON][collection] by default, or the ability to auto-magically create HATEOAS style APIs.  Doing so would involve making opinionated choices about API design that should really remain outside of the framework's scope.
+What REST framework doesn't do is give you is machine readable hypermedia formats such as [Collection+JSON][collection] or HTML [microformats] by default, or the ability to auto-magically create HATEOAS style APIs.  Doing so would involve making opinionated choices about API design that should really remain outside of the framework's scope.
 
 [cite]: http://vimeo.com/channels/restfest/page:2
 [dissertation]: http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm
@@ -45,6 +45,7 @@ What REST framework doesn't do is give you is machine readable hypermedia format
 [maturitymodel]: http://martinfowler.com/articles/richardsonMaturityModel.html
 
 [collection]: http://www.amundsen.com/media-types/collection/
+[microformats]: http://microformats.org/wiki/Main_Page
 [serialization]: ../api-guide/serializers.md
 [parser]: ../api-guide/parsers.md
 [renderer]: ../api-guide/renderers.md

rest_framework/fields.py

@@ -161,7 +161,9 @@ class WritableField(Field):
         try:
             native = data[field_name]
         except KeyError:
-            return  # TODO Consider validation behaviour, 'required' opt etc...
+            if self.required:
+                raise ValidationError(self.error_messages['required'])
+            return
 
         value = self.from_native(native)
         if self.source == '*':

rest_framework/request.py

@@ -225,7 +225,6 @@ class Request(object):
         if (self._METHOD_PARAM and
             self._METHOD_PARAM in self._data):
             self._method = self._data[self._METHOD_PARAM].upper()
-            self._data.pop(self._METHOD_PARAM)
 
         # Content overloading - modify the content type, and force re-parse.
         if (self._CONTENT_PARAM and

rest_framework/serializers.py

@@ -371,9 +371,14 @@ class ModelSerializer(Serializer):
             models.BooleanField: BooleanField,
         }
         try:
-            return field_mapping[model_field.__class__]()
+            ret = field_mapping[model_field.__class__]()
         except KeyError:
-            return ModelField(model_field=model_field)
+            ret = ModelField(model_field=model_field)
+
+        if model_field.default:
+            ret.required = False
+
+        return ret
 
     def restore_object(self, attrs, instance=None):
         """

rest_framework/tests/serializer.py

@@ -1,3 +1,4 @@
+import copy
 import datetime
 from django.test import TestCase
 from rest_framework import serializers
@@ -93,6 +94,15 @@ class ValidationTests(TestCase):
         self.assertEquals(serializer.is_valid(), False)
         self.assertEquals(serializer.errors, {'content': [u'Ensure this value has at most 1000 characters (it has 1001).']})
 
+    def test_update_missing_field(self):
+        data = {
+            'content': 'xxx',
+            'created': datetime.datetime(2012, 1, 1)
+        }
+        serializer = CommentSerializer(data, instance=self.comment)
+        self.assertEquals(serializer.is_valid(), False)
+        self.assertEquals(serializer.errors, {'email': [u'This field is required.']})
+
 
 class MetadataTests(TestCase):
     def test_empty(self):

rest_framework/tests/views.py

@@ -17,12 +17,14 @@ class BasicView(APIView):
         return Response({'method': 'POST', 'data': request.DATA})
 
 
-@api_view(['GET', 'POST'])
+@api_view(['GET', 'POST', 'PUT'])
 def basic_view(request):
     if request.method == 'GET':
         return {'method': 'GET'}
     elif request.method == 'POST':
         return {'method': 'POST', 'data': request.DATA}
+    elif request.method == 'PUT':
+        return {'method': 'PUT', 'data': request.DATA}
 
 
 class ClassBasedViewIntegrationTests(TestCase):