Filtering on datetime raises TypeError

[sloria]

The following code is meant to filter the Items that are checked out and updated in the past hour. However, the updated__gt query causes a TypeError to be raised.

from datetime import datetime, timedelta
from stdnet import odm

class Item(odm.StdModel):
    name = odm.CharField(required=True)
    checked_out = odm.BooleanField(default=False)
    updated = odm.DateTimeField(default=datetime.utcnow)

models = odm.Router("redis://")
models.register(Item)

item = models.item.new(name="foo", checked_out=True)
item.save()
hour_ago  = datetime.utcnow() - timedelta(hours=1)
recent = models.item.filter(checked_out=True,
                            updated__gt=hour_ago).sort_by("-updated").all()

Stack trace:

Traceback (most recent call last):
  File "tmp.py", line 16, in <module>
    updated__gt=hour_ago).sort_by("-updated").all()
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/odm/query.py", line 256, in all
    return self.items()
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/odm/query.py", line 581, in items
    return self.backend_query().items(callback=callback)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/odm/query.py", line 615, in backend_query
    return q if isinstance(q, EmptyQuery) else q.backend_query(**kwargs)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/odm/query.py", line 198, in backend_query
    self.__backend_query = self.backend.Query(self, **kwargs)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/utils/async.py", line 116, in __init__
    self._build(**kwargs)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/backends/redisb/__init__.py", line 149, in _build
    be = value.backend_query(pipe=pipe)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/odm/query.py", line 198, in backend_query
    self.__backend_query = self.backend.Query(self, **kwargs)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/utils/async.py", line 116, in __init__
    self._build(**kwargs)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/backends/redisb/__init__.py", line 154, in _build
    value = self.dump_nested(*value)
  File "/Users/sloria1/Envs/tmp/lib/python2.7/site-packages/stdnet/backends/redisb/__init__.py", line 255, in dump_nested
    return json.dumps((value, nested_args))
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 243, in dumps
    return _default_encoder.encode(obj)
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 207, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 270, in iterencode
    return _iterencode(o, 0)
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/encoder.py", line 184, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: datetime.datetime(2013, 12, 1, 1, 6, 4, 110880) is not JSON serializable

[lsbardel]

Looks like a bug,
Could you write a test using your example?
You could put the test into a new file dates.py within the tests.all.fields module.

Something like this

class TestItem(test.TestCase):
     model = Item
     def test_filter(self):
          models = self.mapper
          ...

Once done that I can take a look.
Thanks