Make user_id and role_id required in base_user_role_line

base_user_role/models/role.py

@@ -66,9 +66,10 @@ class ResUsersRoleLine(models.Model):
     _description = 'Users associated to a role'
 
     role_id = fields.Many2one(
-        'res.users.role', string=u"Role", ondelete='cascade')
+        'res.users.role', required=True, string=u"Role", ondelete='cascade')
     user_id = fields.Many2one(
-        'res.users', string=u"User", domain=[('id', '!=', SUPERUSER_ID)])
+        'res.users', required=True, string=u"User",
+        domain=[('id', '!=', SUPERUSER_ID)], ondelete='cascade')
     date_from = fields.Date(u"From")
     date_to = fields.Date(u"To")
     is_enabled = fields.Boolean(u"Enabled", compute='_compute_is_enabled')