[Xapian-discuss] Using a subclass of MatchSpy in Python bindings

Doctor Munchkin doctormunchkin at gmail.com
Wed Dec 1 13:18:40 GMT 2010

Hi everyone,

I've searched the mail archives and I haven't been able to find a
solution to this. I want to subclass a MatchSpy in the Python bindings
and have Enquire use it. However, when I try to do so, I get a
TypeError raised. The following example illustrates this:

>>> import xapian
>>> database = xapian.Database(dbpath)
>>> class MyMatchSpy(xapian.MatchSpy):
...     def __init__(self):
...             pass
...     def __call__(self, *args, **kw):
...             print "called with", args, kw
>>> ms = MyMatchSpy()
>>> enquire = xapian.Enquire(database)
>>> enquire.add_matchspy(ms)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/dist-packages/xapian/__init__.py", line
6920, in _enquire_match_spy_add
    _enquire_add_matchspy_orig(self, decider)
TypeError: in method 'Enquire_add_matchspy', argument 2 of type
'Xapian::MatchSpy *'

Am I missing something obvious here, or is swig misbehaving? The above
works if ms is an instance of xapian.ValueCountMatchSpy, but I need to
implement something different to this.

I'm running the latest Xapian from Debian sid:

>>> xapian.version_string()



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