app/django/core/serializers/pyyaml.py
author Sverre Rabbelier <srabbelier@gmail.com>
Tue, 02 Dec 2008 20:10:23 +0000
changeset 649 95a41542e693
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Finish Program Added some fields, and made TinyMCE the editor for the description field. Also updated the public page to show these new fields. We really need generic public views... Patch by: Sverre Rabbelier
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"""
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YAML serializer.
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Requires PyYaml (http://pyyaml.org/), but that's checked for in __init__.
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"""
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from StringIO import StringIO
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import yaml
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from django.db import models
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from django.core.serializers.python import Serializer as PythonSerializer
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from django.core.serializers.python import Deserializer as PythonDeserializer
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class Serializer(PythonSerializer):
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    """
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    Convert a queryset to YAML.
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    """
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    internal_use_only = False
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    def handle_field(self, obj, field):
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        # A nasty special case: base YAML doesn't support serialization of time
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        # types (as opposed to dates or datetimes, which it does support). Since
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        # we want to use the "safe" serializer for better interoperability, we
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        # need to do something with those pesky times. Converting 'em to strings
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        # isn't perfect, but it's better than a "!!python/time" type which would
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        # halt deserialization under any other language.
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        if isinstance(field, models.TimeField) and getattr(obj, field.name) is not None:
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            self._current[field.name] = str(getattr(obj, field.name))
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        else:
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            super(Serializer, self).handle_field(obj, field)
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    def end_serialization(self):
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        self.options.pop('stream', None)
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        self.options.pop('fields', None)
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        yaml.safe_dump(self.objects, self.stream, **self.options)
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    def getvalue(self):
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        return self.stream.getvalue()
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def Deserializer(stream_or_string, **options):
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    """
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    Deserialize a stream or string of YAML data.
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    """
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    if isinstance(stream_or_string, basestring):
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        stream = StringIO(stream_or_string)
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    else:
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        stream = stream_or_string
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    for obj in PythonDeserializer(yaml.load(stream)):
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        yield obj
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