gistfile1.py

total = self.document_storage.count()

scope = dict(total=total)

results = self.collection.map_reduce(
    map_function,
    reduce_function,
    finalize=finalize_function,
    scope=scope,
    query={'term': { '$in': list(terms)}},
    out=bson.son.SON(dict(inline=1)))
scored_results = sorted(
    results['results'],
    key=lambda x: x['value'],
    reverse=True)[offset:limit]