Strange behaviour with multiple elements on first level in contents

[Joshua Gleitze]

I recognized some very strange behaviours concerning multiple elements on the first level in "contents" of a document. Here is what I managed to reproduce:

The example http://bazaar.launchpad.net/~uonedb-qt/u1db-qt/trunk/view/head:/examples/u1db-qt-example-5/u1db-qt-example-5.qml normally produces a ListView like this:

(0) 'Hello World 1'
(1) 'Hello World 2'
(2) 'Hello World 2.5'
(3) 'Hello World 3'
(4) 'Hello World 3.33'
(5) 'Hello World 3.66'

If I now change the structure to have both "message" and "id" as a first level element, like this:

U1db.Document {
            database: aDatabase
            docId: 'helloworld1'
            create: true
            defaults: { "message":"Hello World", "id": 1 }

        }

       U1db.Document {
            database: aDatabase
            docId: 'helloworld2'
            create: true
            defaults: { "message":"Hello World", "id": 2 }
        }

       U1db.Document {
            database: aDatabase
            docId: 'helloworld3'
            create: true
            contents: { "message":"Hello World", "id": 3 }
        }

       U1db.Index{
           database: aDatabase
           id: by_helloworld
           expression: ["id","message"]
       }

       U1db.Query{
           id: aQuery
           index: by_helloworld
       }

I get this output:

(0) 'undefined 1'
(1) 'undefined 2'
(2) 'undefined 3'

JSON.stringify(aQuery) shows that this is not a bug related to ListView, but that the Documents don’t show up properly:
{"index":{"database":{"error":"","objectName":"","path":"aDatabase5"},"name":"","objectName":"","expression":{"0":"id","1":"message"}},"objectName":"","results":[{"id":1},{"id":2},{"id":3}],"documents":{"0":"helloworld1","1":"helloworld2","2":"helloworld3"}}

Making "message" an Integer or "id" a String doesn’t change anything: "message" is undefined while "id" works. Swapping "message" and "id" in contents ({ "id": 3, "message":"Hello World" } instead of { "message": "Hello World", "id":3 }) doesn’t change anything, either.

But now, things are getting very strange, if i don’t call "message" "message" anymore, but "dj", like this:

import QtQuick 2.0
import U1db 1.0 as U1db
import Ubuntu.Components 0.1

MainView {
    width: units.gu(45)
    height: units.gu(80)

        U1db.Database {
            id: aDatabase
            path: "aDatabase5"
        }

       U1db.Document {
            database: aDatabase
            docId: 'helloworld1'
            create: true
            defaults: { "id": 1 ,"dj":"Hello World",}

        }

       U1db.Document {
            database: aDatabase
            docId: 'helloworld2'
            create: true
            defaults: { "id": 2 , "dj":"Hello World",}
        }

       U1db.Document {
            database: aDatabase
            docId: 'helloworld3'
            create: true
            contents: { "id": 3, "dj":"Hello World", }
        }

       U1db.Index{
           database: aDatabase
           id: by_helloworld
           expression: ["id","dj"]
       }

       U1db.Query{
           id: aQuery
           index: by_helloworld
       }

        Tabs {
            id: tabs

            Component.onCompleted: console.log(JSON.stringify(aQuery))

            Tab {
                title: i18n.tr("Hello U1Db!")

                page: Page {
                    id: helloPage

                    ListView {
                        width: units.gu(45)
                        height: units.gu(80)
                        model: aQuery
                        delegate: Text {
                            text: "(" + index + ") '" + contents.dj + " " + contents.id + "'"
                    }
                }
            }
        }
    }
}

In that case, all of a sudden, you can see "dj", while "id" is undefined:

(0) 'Hello World undefined'
(1) 'Hello World undefined'
(2) 'Hello World undefined'

JSON.stringify(aQuery) gives accordingly:
 {"index":{"database":{"error":"","objectName":"","path":"aDatabase5"},"name":"","objectName":"","expression":{"0":"id","1":"dj"}},"objectName":"","results":[{"dj":"Hello World"},{"dj":"Hello World"},{"dj":"Hello World"}],"documents":{"0":"helloworld1","1":"helloworld2","2":"helloworld3"}}

As above, changing the type of the variables or swapping their order doesn’t change a thing.

[Joshua Gleitze (joshua-gleitze)]

All of the above works as expected if you have one element on the first level an the other elements are children of the one element.

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:u1db-qt at revision 114, scheduled for release in u1db-qt, milestone 1.0

[Launchpad Janitor (janitor)]

This bug was fixed in the package u1db-qt - 0.1.5+14.04.20140313-0ubuntu1

---------------
u1db-qt (0.1.5+14.04.20140313-0ubuntu1) trusty; urgency=low

  [ CI bot ]
  * No change rebuild against Qt 5.2.1.

  [ Christian Dywan ]
  * Adopt xvfb.sh script from ui toolkit to run tests
  * Sort out build warnings and make them always fatal.
  * Implement Database.removeDoc method and use it in unit test
    Functionally this is equivalent to replacing the doc with an empty
    one. (LP: #1243395)
  * Use new-style qmlrunner log option to enable stdout.
  * Query improvements and more advanced example. (LP: #1271977,
    #1271972, #1266478)
  * Store whole document contents in the results and unit test that.
    (LP: #1271973)
  * Reverse query logic to check non-matching and internally convert
    between query syntaxes. (LP: #1284194, #1214538, #1215898)
  * Revert r113 and update unit test to verify previous behavior
 -- Ubuntu daily release <email address hidden> Thu, 13 Mar 2014 23:12:40 +0000