Odoo : How to display the "Force Availability" by dynamically? - xpath

Question

I'm trying to display the "Force Availability" dynamically when SO Transfering. I did as following, but not working. How do I do?
def fields_view_get(self, cr, uid, view_id=None, view_type='form', context=True, toolbar=False, submenu=False):
result = super(StockPicking, self).fields_view_get(cr, uid, view_id, view_type, context, toolbar, submenu)
if view_type == 'form':
obj_so_settings = self.pool.get('sale.config.settings')
so_config_ids = obj_so_settings.search(cr, uid, [], limit=1, order='id DESC', context=context)
if so_config_ids:
so_settings = obj_so_settings.browse(cr, uid, so_config_ids[0], context=context)
if so_settings.remove_force_availability:
result.update({'arch': result['arch']
+ '<xpath expr="//button[#name=\'force_assign\']" position="attributes">'
'<attribute name="invisible">1</attribute></xpath>'})
else:
pass
return result
result['arch'] is holding the whole stock_picking form data.

Answer 1

finally I got it
from lxml import etree
def fields_view_get(self, cr, uid, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):
if not context:
context = {}
res = super(custom_stock_pick, self).fields_view_get(cr, uid, view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
if view_type == 'form':
remove_force_availability = False
so_settings_obj = self.pool.get('sale.config.settings')
so_config_ids = so_settings_obj.search(cr, uid, [], limit=1, order='id DESC', context=context)
if so_config_ids:
so_settings = so_settings_obj.browse(cr, uid, so_config_ids[0], context=context)
remove_force_availability = so_settings.group_remove_force_availability
if remove_force_availability:
if res['name'] == 'stock.picking.form':
doc = etree.fromstring(res['arch'])
nodes = doc.findall(".//*[#name='force_assign']")
for node in nodes:
parent = node.getparent()
parent.remove(node)
res['arch'] = etree.tostring(doc)
return res