renderAll() not working in fabric.js

Question

I have six floors of a building drawn on a canvas with fabric.js. In order to show only one floor, I do this:

building.selectFloor = function(floorId){

    for (var i = 0; i < floors.length; i++){
        if (floorId == floors[i].name){
            floors[i].visible = true;
        }else{
            floors[i].visible = false;          
        }
    }
    canvas.renderAll();
};

But nothing changes - all floors are still visible. The floors set to visible = false don't disappear until renderAll() is called later on a window resize:

$(window).resize(setSize);
setSize();


function setSize(){
    viewportWidth = $(window).width();
    viewportHeight = $(window).height();
    $appContainer.css({ "width": viewportWidth, "height": viewportHeight}); 
    canvas.setDimensions({ width: viewportWidth, height: viewportHeight });
    if (canvas.building){
        canvas.building.center();
        canvas.building.scaleX = canvas.building.scaleY = (viewportWidth + viewportHeight) / (1920 + 1080);
        canvas.renderAll();
    }
}

but then they do disappear. Why is one renderAll() working, and the other not? I've tried wrapping the non-functioning renderAll() in a window.timeOut to see if a delay helps, but no luck.

Answer 1

Ok - so I figured it out in the end: building is a group which appears to be getting cached by some internal fabric magic, and the cached version is being rendered instead of the updated version. To render the updated version you have to do this

canvas.building.set('dirty', true);
canvas.renderAll();

Hope that helps someone on down the line.

EDIT

Turns out there's an easier solution still:

canvas.building.objectCaching = false

Answer 2

There is a new version that changed the format to:

canvas.requestRenderAll();