--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/core/serializers/python.py	Fri Jul 18 18:22:23 2008 +0000
@@ -0,0 +1,107 @@
+"""
+A Python "serializer". Doesn't do much serializing per se -- just converts to
+and from basic Python data types (lists, dicts, strings, etc.). Useful as a basis for
+other serializers.
+"""
+
+from django.conf import settings
+from django.core.serializers import base
+from django.db import models
+from django.utils.encoding import smart_unicode
+
+class Serializer(base.Serializer):
+    """
+    Serializes a QuerySet to basic Python objects.
+    """
+    
+    internal_use_only = True
+    
+    def start_serialization(self):
+        self._current = None
+        self.objects = []
+
+    def end_serialization(self):
+        pass
+
+    def start_object(self, obj):
+        self._current = {}
+
+    def end_object(self, obj):
+        self.objects.append({
+            "model"  : smart_unicode(obj._meta),
+            "pk"     : smart_unicode(obj._get_pk_val(), strings_only=True),
+            "fields" : self._current
+        })
+        self._current = None
+
+    def handle_field(self, obj, field):
+        self._current[field.name] = smart_unicode(getattr(obj, field.name), strings_only=True)
+
+    def handle_fk_field(self, obj, field):
+        related = getattr(obj, field.name)
+        if related is not None:
+            if field.rel.field_name == related._meta.pk.name:
+                # Related to remote object via primary key
+                related = related._get_pk_val()
+            else:
+                # Related to remote object via other field
+                related = getattr(related, field.rel.field_name)
+        self._current[field.name] = smart_unicode(related, strings_only=True)
+
+    def handle_m2m_field(self, obj, field):
+        self._current[field.name] = [smart_unicode(related._get_pk_val(), strings_only=True)
+                           for related in getattr(obj, field.name).iterator()]
+
+    def getvalue(self):
+        return self.objects
+
+def Deserializer(object_list, **options):
+    """
+    Deserialize simple Python objects back into Django ORM instances.
+
+    It's expected that you pass the Python objects themselves (instead of a
+    stream or a string) to the constructor
+    """
+    models.get_apps()
+    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 : Model._meta.pk.to_python(d["pk"])}
+        m2m_data = {}
+
+        # Handle each field
+        for (field_name, field_value) in d["fields"].iteritems():
+            if isinstance(field_value, str):
+                field_value = smart_unicode(field_value, options.get("encoding", settings.DEFAULT_CHARSET), strings_only=True)
+
+            field = Model._meta.get_field(field_name)
+
+            # Handle M2M relations
+            if field.rel and isinstance(field.rel, models.ManyToManyRel):
+                m2m_convert = field.rel.to._meta.pk.to_python
+                m2m_data[field.name] = [m2m_convert(smart_unicode(pk)) for pk in field_value]
+
+            # Handle FK fields
+            elif field.rel and isinstance(field.rel, models.ManyToOneRel):
+                if field_value:
+                    data[field.attname] = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)
+                else:
+                    data[field.attname] = None
+
+            # Handle all other fields
+            else:
+                data[field.name] = field.to_python(field_value)
+
+        yield base.DeserializedObject(Model(**data), m2m_data)
+
+def _get_model(model_identifier):
+    """
+    Helper to look up a model from an "app_label.module_name" string.
+    """
+    try:
+        Model = models.get_model(*model_identifier.split("."))
+    except TypeError:
+        Model = None
+    if Model is None:
+        raise base.DeserializationError(u"Invalid model identifier: '%s'" % model_identifier)
+    return Model