DTCloud arch 的解析与属性增加变更

[Amos]

arch_tree = etree.fromstring(form_view.arch)
                if arch_tree.tag == 'form':
                    arch_tree.insert(0, etree.Element('field', attrib={
                        'name': 'available_partner_bank_ids',
                        'invisible': '1',
                    }))
                    form_view.sudo().write({'arch': etree.tostring(arch_tree, encoding='unicode')})