Added various fixes to serializer implementations. Fixes mostly deal with handling nulls, non-integer primary key values (e.g., OneToOne fields or strings), and reconstruction of primary key references in related fields.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4718 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/serializers/base.py

@@ -54,11 +54,7 @@ class Serializer(object):
         Convert a field's value to a string.
         """
         if isinstance(field, models.DateTimeField):
-            value = getattr(obj, field.name)
-            if value is None:
-                value = ''
-            else:
-                value = value.strftime("%Y-%m-%d %H:%M:%S")
+            value = getattr(obj, field.name).strftime("%Y-%m-%d %H:%M:%S")
         elif isinstance(field, models.FileField):
             value = getattr(obj, "get_%s_url" % field.name, lambda: None)()
         else:

django/core/serializers/python.py

@@ -57,7 +57,7 @@ def Deserializer(object_list, **options):
     for d in object_list:
         # Look up the model and starting build a dict of data for it.
         Model = _get_model(d["model"])
-        data = {Model._meta.pk.attname : d["pk"]}
+        data = {Model._meta.pk.attname : Model._meta.pk.to_python(d["pk"])}
         m2m_data = {}
         
         # Handle each field
@@ -70,16 +70,17 @@ def Deserializer(object_list, **options):
             # Handle M2M relations
             if field.rel and isinstance(field.rel, models.ManyToManyRel):
                 pks = []
+                m2m_convert = field.rel.to._meta.pk.to_python
                 for pk in field_value:
                     if isinstance(pk, unicode):
-                        pks.append(pk.encode(options.get("encoding", settings.DEFAULT_CHARSET)))
+                        pks.append(m2m_convert(pk.encode(options.get("encoding", settings.DEFAULT_CHARSET))))
                     else:
-                        pks.append(pk)
+                        pks.append(m2m_convert(pk))
                 m2m_data[field.name] = pks
                 
             # Handle FK fields
             elif field.rel and isinstance(field.rel, models.ManyToOneRel):
-                data[field.attname] = field_value
+                data[field.attname] = field.rel.to._meta.pk.to_python(field_value)
                     
             # Handle all other fields
             else:

django/core/serializers/xml_serializer.py

@@ -57,10 +57,12 @@ class Serializer(base.Serializer):
         })
         
         # Get a "string version" of the object's data (this is handled by the
-        # serializer base class).  None is handled specially.
-        value = self.get_string_value(obj, field)
-        if value is not None:
+        # serializer base class). 
+        if getattr(obj, field.name) is not None:
+            value = self.get_string_value(obj, field)
             self.xml.characters(str(value))
+        else:
+            self.xml.addQuickElement("None")
 
         self.xml.endElement("field")
         
@@ -127,7 +129,8 @@ class Deserializer(base.Deserializer):
         pk = node.getAttribute("pk")
         if not pk:
             raise base.DeserializationError("<object> node is missing the 'pk' attribute")
-        data = {Model._meta.pk.name : pk}
+
+        data = {Model._meta.pk.attname : Model._meta.pk.to_python(pk)}
         
         # Also start building a dict of m2m data (this is saved as
         # {m2m_accessor_attribute : [list_of_related_objects]})
@@ -148,17 +151,20 @@ class Deserializer(base.Deserializer):
             
             # As is usually the case, relation fields get the special treatment.
             if field.rel and isinstance(field.rel, models.ManyToManyRel):
-                m2m_data[field.name] = self._handle_m2m_field_node(field_node)
+                m2m_data[field.name] = self._handle_m2m_field_node(field_node, field)
             elif field.rel and isinstance(field.rel, models.ManyToOneRel):
-                data[field.attname] = self._handle_fk_field_node(field_node)
+                data[field.attname] = self._handle_fk_field_node(field_node, field)
             else:
-                value = field.to_python(getInnerText(field_node).strip().encode(self.encoding))
+                if len(field_node.childNodes) == 1 and field_node.childNodes[0].nodeName == 'None':
+                    value = None
+                else:
+                    value = field.to_python(getInnerText(field_node).strip().encode(self.encoding))
                 data[field.name] = value
         
         # Return a DeserializedObject so that the m2m data has a place to live.
         return base.DeserializedObject(Model(**data), m2m_data)
         
-    def _handle_fk_field_node(self, node):
+    def _handle_fk_field_node(self, node, field):
         """
         Handle a <field> node for a ForeignKey
         """
@@ -166,13 +172,16 @@ class Deserializer(base.Deserializer):
         if len(node.childNodes) == 1 and node.childNodes[0].nodeName == 'None':
             return None
         else:
-            return getInnerText(node).strip().encode(self.encoding)
+            return field.rel.to._meta.pk.to_python(
+                       getInnerText(node).strip().encode(self.encoding))
         
-    def _handle_m2m_field_node(self, node):
+    def _handle_m2m_field_node(self, node, field):
         """
         Handle a <field> node for a ManyToManyField
         """
-        return [c.getAttribute("pk").encode(self.encoding) for c in node.getElementsByTagName("object")]
+        return [field.rel.to._meta.pk.to_python(
+                    c.getAttribute("pk").encode(self.encoding)) 
+                    for c in node.getElementsByTagName("object")]
     
     def _get_model_from_node(self, node, attr):
         """