Set root path

def set_root_path(self, root_path):
        """Set root path"""
        self.root_path = root_path
        self.install_model()
        index = self.fsmodel.setRootPath(root_path)
        self.proxymodel.setup_filter(self.root_path, [])
        self.setRootIndex(self.proxymodel.mapFromSource(index))