+
−"""
+
−YAML serializer.
+
−
+
−Requires PyYaml (http://pyyaml.org/), but that's checked for in __init__.
+
−"""
+
−
+
−from StringIO import StringIO
+
−import yaml
+
−
+
−from django.db import models
+
−from django.core.serializers.python import Serializer as PythonSerializer
+
−from django.core.serializers.python import Deserializer as PythonDeserializer
+
−
+
−class Serializer(PythonSerializer):
+
−    """
+
−    Convert a queryset to YAML.
+
−    """
+
−    
+
−    internal_use_only = False
+
−    
+
−    def handle_field(self, obj, field):
+
−        # A nasty special case: base YAML doesn't support serialization of time
+
−        # types (as opposed to dates or datetimes, which it does support). Since
+
−        # we want to use the "safe" serializer for better interoperability, we
+
−        # need to do something with those pesky times. Converting 'em to strings
+
−        # isn't perfect, but it's better than a "!!python/time" type which would
+
−        # halt deserialization under any other language.
+
−        if isinstance(field, models.TimeField) and getattr(obj, field.name) is not None:
+
−            self._current[field.name] = str(getattr(obj, field.name))
+
−        else:
+
−            super(Serializer, self).handle_field(obj, field)
+
−    
+
−    def end_serialization(self):
+
−        self.options.pop('stream', None)
+
−        self.options.pop('fields', None)
+
−        yaml.safe_dump(self.objects, self.stream, **self.options)
+
−
+
−    def getvalue(self):
+
−        return self.stream.getvalue()
+
−
+
−def Deserializer(stream_or_string, **options):
+
−    """
+
−    Deserialize a stream or string of YAML data.
+
−    """
+
−    if isinstance(stream_or_string, basestring):
+
−        stream = StringIO(stream_or_string)
+
−    else:
+
−        stream = stream_or_string
+
−    for obj in PythonDeserializer(yaml.load(stream)):
+
−        yield obj
+
−