How to use the timesketch.apps.sketch.models.Sketch function in timesketch

def setUp(self):
        self.user1 = User.objects.create(username="testuser1")
        self.user2 = User.objects.create(username="testuser2")
        self.sketch1 = Sketch.objects.create(
            user=self.user1, title="testsketch1")
        self.sketch2 = Sketch.objects.create(
            user=self.user1, title="testsketch2")
        SavedView.objects.create(
            user=self.user1, sketch=self.sketch2, query="", filter="")
        self.sketch1.make_public(self.user1)
        self.sketch2.make_private(self.user1)

def obj_create(self, bundle, **kwargs):
        """Create new timeline for a sketch."""
        req_data = json.loads(bundle.request.body)['data']
        sketch = Sketch.objects.get(id=req_data['sketch'])
        timeline = Timeline.objects.get(id=req_data['timeline'])
        try:
            sketch_timeline = SketchTimeline.objects.get(timeline=timeline, 
                sketch=sketch)
        except SketchTimeline.DoesNotExist:
            sketch_timeline = SketchTimeline.objects.create(timeline=timeline)
            sketch_timeline.color = sketch_timeline.generate_color()
            sketch_timeline.save()
        sketch.timelines.add(sketch_timeline)
        sketch.save()
        return bundle

def home(request):
    """Renders the available sketches for the user."""
    my_sketches = Sketch.objects.filter(user=request.user).order_by("-created")
    public_sketches = set()
    for sketch in Sketch.objects.all().exclude(user=request.user):
        if sketch.is_public():
            public_sketches.add(sketch)
    context = {"my_sketches": my_sketches, "public_sketches": public_sketches}
    return render(request, 'home.html', context)

def alter_list_data_to_serialize(self, request, data):
        timeline_colors = {}
        timeline_names = {}
        sketch = Sketch.objects.get(id=request.GET['sketch'])
        for t in sketch.timelines.all():
            timeline_colors[t.timeline.datastore_index] = t.color
            timeline_names[t.timeline.datastore_index] = t.timeline.title
        try:
            data['meta']['es_time'] = self.query_result['took']
            data['meta']['es_total_count'] = self.query_result['hits']['total']
        except KeyError:
            data['meta']['es_time'] = 0
            data['meta']['es_total_count'] = 0
        data['meta']['timeline_colors'] = timeline_colors
        data['meta']['timeline_names'] = timeline_names
        return data

def home(request):
    """Renders the available sketches for the user."""
    my_sketches = Sketch.objects.filter(user=request.user).order_by("-created")
    public_sketches = set()
    for sketch in Sketch.objects.all().exclude(user=request.user):
        if sketch.is_public():
            public_sketches.add(sketch)
    context = {"my_sketches": my_sketches, "public_sketches": public_sketches}
    return render(request, 'home.html', context)

def alter_list_data_to_serialize(self, request, data):
        timeline_colors = {}
        timeline_names = {}
        sketch = Sketch.objects.get(id=request.GET['sketch'])
        for t in sketch.timelines.all():
            timeline_colors[t.timeline.datastore_index] = t.color
            timeline_names[t.timeline.datastore_index] = t.timeline.title
        try:
            data['meta']['es_time'] = self.query_result['took']
            data['meta']['es_total_count'] = self.query_result['hits']['total']
        except KeyError:
            data['meta']['es_time'] = 0
            data['meta']['es_total_count'] = 0
        data['meta']['timeline_colors'] = timeline_colors
        data['meta']['timeline_names'] = timeline_names
        return data

def obj_create(self, bundle, **kwargs):
        req_data = json.loads(bundle.request.body)['data']
        sketch = Sketch.objects.get(id=req_data['sketch'])
        if req_data['sketch_acl'] == "public":
            sketch.make_public(bundle.request.user)
        else:
            sketch.make_private(bundle.request.user)
        return bundle