Remplace set sale_device context from _preferences_fields to _get_preferences

Check rule only if _check_access is set and enforce companies rule
issue4080
#163126

user.py

@@ -7,23 +7,18 @@ from trytond.pool import PoolMeta
 from trytond.pyson import Eval
 
 
-__all__ = ['User']
-
-
 class User(metaclass=PoolMeta):
     __name__ = "res.user"
     sale_device = fields.Many2One('sale.device', 'Sale Device',
             domain=[('shop', '=', Eval('shop'))],
             depends=['shop']
-    )
+            )
 
     @classmethod
     def __setup__(cls):
         super(User, cls).__setup__()
-        if 'sale_device' not in cls._preferences_fields:
-            cls._preferences_fields.extend([
-                    'sale_device',
-                    ])
+        if 'sale_device' not in cls._context_fields:
+            cls._context_fields.insert(0, 'sale_device')
 
     @classmethod
     def __register__(cls, module_name):
@@ -41,3 +36,11 @@ class User(metaclass=PoolMeta):
     def on_change_company(self):
         super().on_change_company()
         self.sale_device = None
+
+    @classmethod
+    def _get_preferences(cls, user, context_only=False):
+        res = super(User, cls)._get_preferences(user,
+            context_only=context_only)
+        if not context_only:
+            res['sale_device'] = user.sale_device and user.sale_device.id or None
+        return res