'Migrate from [{"name":"path1"},{"name":"path2"},...] to ["path1", "path2", ...]'

def backwards(self, orm):

    for fs in orm.Fs.objects.all():
        new_mkdirs = []
        for mkdir in json.loads(fs.mkdirs):
            if (isinstance(mkdir, dict) and ('name' in mkdir)):
                new_mkdirs.append(mkdir['name'])
        new_touchzs = []
        for touchzs in json.loads(fs.touchzs):
            if (isinstance(touchzs, dict) and ('name' in touchzs)):
                new_touchzs.append(touchzs['name'])
        if new_mkdirs:
            fs.mkdirs = json.dumps(new_mkdirs)
        if new_touchzs:
            fs.touchzs = json.dumps(new_touchzs)
        fs.save()
