How to transform geometry in django rest framework gis

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Python

REST

PostgreSQL

Django

i am newbie to django and developing rest api using Django rest framework gis. Previously i was using sql query for transform geometry

select id,name,round(value::numeric,2) as value, st_transform(geometry, 3857) as geometry from my_model

class MyModel(models.Model):
    name = models.CharField(max_length=50, blank=True)
    value = models.FloatField()
    geometry = models.GeometryField(null=True, blank=True)


    class Meta:
        db_table = u'my_model'

    def __unicode__(self):
        return '%s' % self.name

Here selrializer class

class MyModelSerializer(serializers.GeoModelSerializer):
    class Meta:
        model = MyModel
        fields = ('id', 'name', 'value', 'geometry')

I have also tried to do this way but cannot transform output

class MyModelViewSet(viewsets.ModelViewSet):

    queryset = MyModel.objects.all().transform(3857)
    serializer_class = MyModelSerializer

How can i do this in django rest framework gis?

Where can i get queries sample or comprehensive tutorial for rest framework gis?