| """ |
| Serialize data to/from JSON |
| """ |
| |
| import datetime |
| import decimal |
| from StringIO import StringIO |
| |
| from django.core.serializers.python import Serializer as PythonSerializer |
| from django.core.serializers.python import Deserializer as PythonDeserializer |
| from django.utils import datetime_safe |
| from django.utils import simplejson |
| |
| class Serializer(PythonSerializer): |
| """ |
| Convert a queryset to JSON. |
| """ |
| internal_use_only = False |
| |
| def end_serialization(self): |
| self.options.pop('stream', None) |
| self.options.pop('fields', None) |
| self.options.pop('use_natural_keys', None) |
| simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder, **self.options) |
| |
| def getvalue(self): |
| if callable(getattr(self.stream, 'getvalue', None)): |
| return self.stream.getvalue() |
| |
| def Deserializer(stream_or_string, **options): |
| """ |
| Deserialize a stream or string of JSON data. |
| """ |
| if isinstance(stream_or_string, basestring): |
| stream = StringIO(stream_or_string) |
| else: |
| stream = stream_or_string |
| for obj in PythonDeserializer(simplejson.load(stream), **options): |
| yield obj |
| |
| class DjangoJSONEncoder(simplejson.JSONEncoder): |
| """ |
| JSONEncoder subclass that knows how to encode date/time and decimal types. |
| """ |
| |
| DATE_FORMAT = "%Y-%m-%d" |
| TIME_FORMAT = "%H:%M:%S" |
| |
| def default(self, o): |
| if isinstance(o, datetime.datetime): |
| d = datetime_safe.new_datetime(o) |
| return d.strftime("%s %s" % (self.DATE_FORMAT, self.TIME_FORMAT)) |
| elif isinstance(o, datetime.date): |
| d = datetime_safe.new_date(o) |
| return d.strftime(self.DATE_FORMAT) |
| elif isinstance(o, datetime.time): |
| return o.strftime(self.TIME_FORMAT) |
| elif isinstance(o, decimal.Decimal): |
| return str(o) |
| else: |
| return super(DjangoJSONEncoder, self).default(o) |
| |
| # Older, deprecated class name (for backwards compatibility purposes). |
| DateTimeAwareJSONEncoder = DjangoJSONEncoder |
| |