[pylucene-dev] ConstantScoreQuery

[Marc Weeber]

hi,

The following code works for me:

hope this helps?!

best,

Marc


----------------


class AssociationFilter(object):
     """
     create a PyLucene Query filter to compute an association score  
between two items

     """

     def __init__(self, source, target):
         self._source = source
         self._target = target

     def bits(self, reader):
         bits = PyLucene.BitSet(reader.maxDoc())
         for id in [self._source, self._target]:
         	termDocs = reader.termDocs(PyLucene.Term('uid', id))
         	docs, freqs = termDocs.read(1)
         	if len(docs) == 1:
         		bits.set(docs[0])
         return bits


filter = AssociationFilter(queryID, answerID)
hits = searcher.search(query, filter)



On 23-aug-2007, at 17:19, tsuraan at tsuraan.net wrote:

> Is it possible to create a ConstantScoreQuery using a python- 
> defined filter?  I'm trying the following, and I get the pasted error:
>
> >>> class MyFilter(object):
> ...  def bits(self, reader):
> ...   return BitSet()
> ...
> >>> f=MyFilter()
> >>> q=ConstantScoreQuery(f)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> pybackend.thirdparty.PyLucene.lnxpyd.PyLucene.InvalidArgsError:  
> (<type 'PyLucene.ConstantScoreQuery'>, '__init__',  
> (<__main__.MyFilter object at 0xb7cda14c>,))
>
>
> So, my other thought was maybe I need to inherit from the PyLucene  
> Filter object, but that doesn't work either:
>
> >>> class MyFilter(Filter):
> ...  def bits(self, reader):
> ...   return BitSet()
> ...
> >>> f=MyFilter()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> pybackend.thirdparty.PyLucene.lnxpyd.PyLucene.InvalidArgsError:  
> (<class '__main__.MyFilter'>, '__init__', ())
>
>
> So, am I missing something, or is ConstantScoreQuery currently only  
> capable of using built-in filters?
>
> I'm using PyLucene 2.1.0-1 on Gentoo Linux with gcc 4.1.2; all  
> tests and sample code works for me.
>
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