Hi, i'm trying to use jsonify to make sure that my custom Null objects
are encoded as 'null'. The following seems to work:
>>> import turbojson
>>> from turbojson.jsonify import jsonify
>>> class Test2: pass
...
>>> @jsonify.when("isinstance(obj, Test2)")
... def jsonify_test2(obj):
... return None
...
>>> turbojson.jsonify.encode(Test2())
'null'
>>>
Yet when I try to write a jsonify function for a Null object
implementation:
>>> class Null(object): # based on cookbook recipie 6.17
... """ Null objects alwasy and reliable 'do nothing'."""
... def __init__(self, *args, **kwars): pass
... def __call__(self, *args, **kwars): return self
... def __repr__(self): return 'Null()'
... def __nonzero__(self): return False
... def __getattr__(self, name): return self
... def __setattr__(self, name, value): return self
... def __delattr__(self, name): return self
... def __getitem__(self, name): return self
... def __setitem__(self, name, value): return self
... def __delitem__(self, name): return self
...
>>> @jsonify.when("isinstance(obj, Null)")
... def jsonify_null(obj):
... return None
...
>>> turbojson.jsonify.encode(Null())
Traceback (most recent call last):
File "<console>", line 1, in ?
File
"c:\python24\lib\site-packages\TurboJson-0.9.2-py2.4.egg\turbojson\jsonify.py",
line 63, in encode
return _instance.encode(obj)
File
"C:\Python24\lib\site-packages\simplejson-1.3-py2.4.egg\simplejson\encoder.py",
line 270, in encode
File
"C:\Python24\lib\site-packages\simplejson-1.3-py2.4.egg\simplejson\encoder.py",
line 231, in _iterencode
File
"C:\Python24\lib\site-packages\simplejson-1.3-py2.4.egg\simplejson\encoder.py",
line 237, in _iterencode_default
File
"c:\python24\lib\site-packages\TurboJson-0.9.2-py2.4.egg\turbojson\jsonify.py",
line 58, in default
return jsonify(obj)
File "<string>", line 5, in jsonify
File "_speedups.pyx", line 376, in
_speedups.BaseDispatcher.__getitem__
File
"C:\Python24\lib\site-packages\ruledispatch-0.5a0dev_r2097-py2.4-win32.egg\dispatch\interfaces.py",
line 15, in __call__
AmbiguousMethod: ([(Signature((2, <class
'dispatch.strategy.Node'>)=TruthCriterion(True)), <function
jsonify_explicit at 0x0118A0F0>), (Signature((0, <class
'dispatch.strategy.Node'>)=Null), <function jsonify_null at
0x018B19F0>)], (None,), {})
The traceback doesn't help much :S... Anythoughts on this?
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