gistfile1.txt

 U1db.Document {
        id: aDocument
        database: aDatabase
        docId: 'helloworld'
        create: true
        defaults: { "hello": "Hello", "worlds": ["one","two","three"] }
 }

U1db.Index {
        database: db
        id: by_type
        /* You have to specify in the index all fields you want to retrieve
           The query should return the whole document, not just indexed fields
           https://bugs.launchpad.net/u1db-qt/+bug/1271973 */
        expression: ["worlds"] //what  whoud be indexed?
    }