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51 lines
1.7 KiB
51 lines
1.7 KiB
""" |
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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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