[Xapian-discuss] having trouble with prefixes

[Christopher Harvey]

I've got a small test database setup with one record.
$ delve -r 1 -V /tmp/1/
Values for record #1: 0:DD4F2162FFFF0E43741A4A1C2B8EC0E7 1:./Text_page_scan_2.jpg 2:jpg 3:.jpg
Term List for record #1: E:.jpg P:./Text_page_scan_2.jpg Q:DD4F2162FFFF0E43741A4A1C2B8EC0E7 T:jpg

The terms were added with lines like this:
	doc.add_term(string("P:") + path);

Problem is, I can't seem to run a query that returns the document using
any of the terms. Here is the outline of the code that runs the queries
I'm trying to run:

	Database db(db_path.string());
	QueryParser queryparser;
	Stem stemmer("english");
	//queryparser.set_stemmer(stemmer);
	queryparser.set_database(db);
	queryparser.add_prefix("type", "T");
	queryparser.add_prefix("md5sum", "Q");
	queryparser.add_prefix("path", "P");
	queryparser.add_prefix("extension", "E");
	//maybe set stemming strategy here (in query parser)?
	queryparser.set_stemming_strategy(QueryParser::STEM_NONE);
	Query query(queryparser.parse_query(full_string));
	cout<<"Query is '"<<full_string<<"'"<<endl;
	Enquire enquire(db);
	enquire.set_query(query);
	MSet match_set(enquire.get_mset(0, 10));
	for_each(match_set.begin(), match_set.end(),
	         [&db](docid id) {
		         print_doc_info(db.get_document(id));
	         });

I expected the following query to work,
md5sum:DD4F2162FFFF0E43741A4A1C2B8EC0E7
but it returns nothing. Same for all the other terms and prefixes. Terms
without prefixes seem to be working normally. I set stemming to NONE on
everything.

All I want is a way to ask xapian to return a list of all documents with
specific paths and/or md5sums.

thanks for any tips,
Chris