SortFilterModel can't filter on subproperty like content.title

[Didier Roche-Tolomelli]

SortFilterModel doesn't enable to filter on subproperty.

Here is a simple non working example:

SortFilterModel {
    id: currentmodel
    model: billsResults
    filter.property: 'contents.title'
    filter.pattern: /BAR/
}

Knowing that most of the u1db models are exporting into a "contents" property handling the rest, it seems that to chain it to a SortFilterModel, it would be interesting to have it able to filter through subproperties

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: qtdeclarative5-ubuntu-ui-toolkit-plugin 1.3.1603+15.10.20150812-0ubuntu1
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu7
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Aug 26 10:10:49 2015
InstallationDate: Installed on 2012-05-28 (1184 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: ubuntu-ui-toolkit
UpgradeStatus: Upgraded to wily on 2014-10-31 (298 days ago)

[Cris Dywan (kalikiana)]

I don't think this conceptually works since even though these are called properties, they are technically role names and can't be nested - what you perceive as sub properties in this context are Variant children.

That said, bug 1266529 addresses this in U1Db.

[Didier Roche-Tolomelli (didrocks)]

I don't think the bug as being invalid (reopening it).
From a developer experience point of view, how would you so direct such children so that they can be filtered in a SortFilterModel, especially when coming from u1db or other where they are are Variant children?

I think there is something to do. The invalid state is bogus, it can be "won't fix", but there is a clearly something we can't filter on. Maybe the least would be a note in the documentation and examples on how to do this directly in, for instance, u1db (once the bug is fixed there).

[Cris Dywan (kalikiana)]

I agree in hindsight this bug can at the least be resolved with better documentation.