66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
"""
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Serialize data to/from JSON
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"""
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import datetime
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from django.utils import simplejson
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from django.utils.simplejson import decoder
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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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try:
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import decimal
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except ImportError:
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from django.utils import _decimal as decimal # Python 2.3 fallback
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class Serializer(PythonSerializer):
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"""
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Convert a queryset to JSON.
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"""
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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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simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options)
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def getvalue(self):
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if callable(getattr(self.stream, 'getvalue', None)):
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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 JSON 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(simplejson.load(stream)):
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yield obj
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class DjangoJSONEncoder(simplejson.JSONEncoder):
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"""
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JSONEncoder subclass that knows how to encode date/time and decimal types.
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"""
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DATE_FORMAT = "%Y-%m-%d"
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TIME_FORMAT = "%H:%M:%S"
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def default(self, o):
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if isinstance(o, datetime.datetime):
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return o.strftime("%s %s" % (self.DATE_FORMAT, self.TIME_FORMAT))
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elif isinstance(o, datetime.date):
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return o.strftime(self.DATE_FORMAT)
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elif isinstance(o, datetime.time):
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return o.strftime(self.TIME_FORMAT)
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elif isinstance(o, decimal.Decimal):
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return str(o)
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else:
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return super(DjangoJSONEncoder, self).default(o)
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# Older, deprecated class name (for backwards compatibility purposes).
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DateTimeAwareJSONEncoder = DjangoJSONEncoder
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