Indexes: Indexing Counters

Counter names can be indexed using CounterNamesFor.

Creating Indexes

The CounterNamesFor method returns all of the counter names for a document passed as the first argument.

List<String> CounterNamesFor(Object doc);

public static class Companies_ByCounterNames extends AbstractIndexCreationTask {
    public Companies_ByCounterNames() {
        map = "from e in docs.Employees\n" +
            "let counterNames = CounterNamesFor(e)\n" +
            "select new\n" +
            "{\n" +
            "   counterNames = counterNames.ToArray()\n" +
            "}";
    }
}

Example

// return all companies that have 'Likes' counter
List<Company> companies = session
    .query(Company.class, Companies_ByCounterNames.class)
    .containsAny("counterNames", Lists.newArrayList("Likes"))
    .toList();