Problem prototype inheritance res partner odoo 8 - odoo-8

Question

I create new class by prototype inheritance from res partner and add fields and methods, but this has effect on res partner creation from UI I get this error:
Traceback (most recent call last):
File "/vagrant/odoo/openerp/http.py", line 546, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/vagrant/odoo/openerp/http.py", line 583, in dispatch
result = self._call_function(**self.params)
File "/vagrant/odoo/openerp/http.py", line 319, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/vagrant/odoo/openerp/service/model.py", line 118, in wrapper
return f(dbname, *args, **kwargs)
File "/vagrant/odoo/openerp/http.py", line 316, in checked_call
return self.endpoint(*a, **kw)
File "/vagrant/odoo/openerp/http.py", line 812, in __call__
return self.method(*args, **kw)
File "/vagrant/odoo/openerp/http.py", line 412, in response_wrap
response = f(*args, **kw)
File "/vagrant/odoo/addons/web/controllers/main.py", line 944, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/vagrant/odoo/addons/web/controllers/main.py", line 936, in _call_kw
return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 268, in wrapper
return old_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 372, in old_api
result = method(recs, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 266, in wrapper
return new_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/addons/base/res/res_partner.py", line 582, in create
return super(res_partner, self).create(vals)
File "/vagrant/odoo/openerp/api.py", line 266, in wrapper
return new_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 508, in new_api
result = method(self._model, cr, uid, *args, **old_kwargs)
File "/vagrant/odoo/addons/mail/mail_thread.py", line 381, in create
thread_id = super(mail_thread, self).create(cr, uid, values, context=context)
File "/vagrant/odoo/openerp/api.py", line 268, in wrapper
return old_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 372, in old_api
result = method(recs, *args, **kwargs)
File "/vagrant/odoo/openerp/models.py", line 4101, in create
record = self.browse(self._create(old_vals))
File "/vagrant/odoo/openerp/api.py", line 266, in wrapper
return new_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 508, in new_api
result = method(self._model, cr, uid, *args, **old_kwargs)
File "/vagrant/odoo/openerp/models.py", line 4313, in _create
cr, user, ids, fields2, context)
File "/vagrant/odoo/openerp/api.py", line 268, in wrapper
return old_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/models.py", line 4451, in _store_set_values
result = column.get(cr, self, ids, f, SUPERUSER_ID, context=context)
File "/vagrant/odoo/openerp/osv/fields.py", line 1462, in get
result = self._fnct(obj, cr, uid, ids, name, self._arg, context)
File "/vagrant/odoo/openerp/addons/base/res/res_partner.py", line 223, in <lambda>
_commercial_partner_id = lambda self, *args, **kwargs: self._commercial_partner_compute(*args, **kwargs)
File "/vagrant/odoo/openerp/api.py", line 268, in wrapper
return old_api(self, *args, **kwargs)
File "/vagrant/odoo/openerp/addons/base/res/res_partner.py", line 210, in _commercial_partner_compute
while not current_partner.is_company and current_partner.parent_id:
File "/vagrant/odoo/openerp/fields.py", line 841, in __get__
return record._cache[self]
File "/vagrant/odoo/openerp/models.py", line 6057, in __getitem__
return value.get() if isinstance(value, SpecialValue) else value
File "/vagrant/odoo/openerp/fields.py", line 56, in get
raise self.exception
MissingError: ('MissingError', u'One of the documents you are trying to access has been deleted, please try again after refreshing.')

Answer 1

The error happens when Odoo calls the fields.function's and try to stores the resulting values in the database directly.
When Odoo initializes fields and process store parameter it uses the key defined in store dictionary as model name (res.partner) and the class name new.partner as the model name in the trigger list.
It happens exactly when it tries to get column value from a new partner using res partner ids, If you look in the res partner class you will see that res.partner model name is hardcoded in some fields when it defines the store attribute.
To avoid that issue you can redefine the commercial_partner_id field and set the store model to new.partner.
Example: alter res.partner fields store model
class NewPartner(osv.Model):
_name = "new.partner"
_description = "new.partner"
_inherit = ['res.partner', 'mail.thread', 'ir.needaction_mixin']
_rec_name = "name"
#api.multi
def _get_image(self, name, args):
return dict((p.id, tools.image_get_resized_images(p.image)) for p in self)
#api.one
def _set_image(self, name, value, args):
return self.write({'image': tools.image_resize_image_big(value)})
_commercial_partner_id = lambda self, *args, **kwargs: self._commercial_partner_compute(*args, **kwargs)
_display_name = lambda self, *args, **kwargs: self._display_name_compute(*args, **kwargs)
_commercial_partner_store_triggers = {
'new.partner': (lambda self, cr, uid, ids, context=None: self.search(cr, uid, [('id', 'child_of', ids)], context=dict(active_test=False)),
['parent_id', 'is_company'], 10)
}
_display_name_store_triggers = {
'new.partner': (lambda self, cr, uid, ids, context=None: self.search(cr, uid, [('id', 'child_of', ids)], context=dict(active_test=False)),
['parent_id', 'is_company', 'name'], 10)
}
_columns = {
'display_name': fields.function(_display_name, type='char', string='Name', store=_display_name_store_triggers, select=True),
'parent_id': fields.many2one('new.partner', 'Related Company', select=True),
'child_ids': fields.one2many('new.partner', 'parent_id', 'Contacts', domain=[('active', '=', True)]),
'image_medium': fields.function(_get_image, fnct_inv=_set_image,
string="Medium-sized image", type="binary", multi="_get_image",
store={
'new.partner': (lambda self, cr, uid, ids, c={}: ids, ['image'], 10),
},
help="Medium-sized image of this contact. It is automatically " \
"resized as a 128x128px image, with aspect ratio preserved. " \
"Use this field in form views or some kanban views."),
'image_small': fields.function(_get_image, fnct_inv=_set_image,
string="Small-sized image", type="binary", multi="_get_image",
store={
'new.partner': (lambda self, cr, uid, ids, c={}: ids, ['image'], 10),
},
help="Small-sized image of this contact. It is automatically " \
"resized as a 64x64px image, with aspect ratio preserved. " \
"Use this field anywhere a small image is required."),
'commercial_partner_id': fields.function(_commercial_partner_id, type='many2one', relation='new.partner', string='Commercial Entity',
store=_commercial_partner_store_triggers)
}