53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
"""
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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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import datetime
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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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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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import yaml
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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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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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