Problem with activate-account: InternalError: UPDATE can not be performed in Read-Only-Transaction

[mbehrle]

On a 3.4 installation with
Flask==0.10.1
Flask-Babel==0.9
Flask-Login==0.2.11
Flask-WTF==0.12

I get the following error on account activation:

127.0.0.1 - - [04/Nov/2015 13:04:35] "GET /de-de/activate-account/10/MTA.Qodg91ri2pb0vLfwcRAmz2vzJbk.CRt-LA._U7gjq4qeg1IBSOVISsJky132uQ?__debugger__=yes&cmd=source&frm=140259930773008&s=ZWtDwIPnlZJb03ASwkAt HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/mathiasb/.virtualenvs/hmi34_2/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/mathiasb/projects/hmi34_2/nereid/nereid/application.py", line 460, in dispatch_request
    req, language=language, active_id=active_id
  File "/home/mathiasb/projects/hmi34_2/nereid/nereid/application.py", line 510, in _dispatch_request
    result = meth(i, **req.view_args)
  File "/home/mathiasb/projects/hmi34_2/nereid/trytond_nereid/user.py", line 572, in activate
    self.save()
  File "/home/mathiasb/projects/hmi34_2/trytond/trytond/model/modelstorage.py", line 1411, in save
    self.write([self], save_values)
  File "/home/mathiasb/projects/hmi34_2/nereid/trytond_nereid/user.py", line 868, in write
    nereid_users, cls._convert_values(values), *args
  File "/home/mathiasb/projects/hmi34_2/trytond/trytond/model/modelsql.py", line 799, in write
    where=red_sql))
  File "/home/mathiasb/projects/hmi34_2/trytond/trytond/backend/postgresql/database.py", line 315, in execute
    return self.cursor.execute(sql, params)
InternalError: FEHLER:  UPDATE kann nicht in einer Read-Only-Transaktion ausgeführt werden

The problem arises from missing kwargs in
https://github.com/fulfilio/nereid/blob/develop/nereid/routing.py#L46
while being set in
https://github.com/fulfilio/nereid/blob/3.4/nereid/helpers.py#L457

Researching the issue leads to
pallets/werkzeug#645
and
pallets/werkzeug#675
as well as
pallets/werkzeug#677

Removing def empty(self): in routing py and using

    def get_empty_kwargs(self):
        """
        Provides kwargs for instantiating empty copy with empty()

        Use this method to provide custom keyword arguments to the subclass of
        ``Rule`` when calling ``some_rule.empty()``.  Helpful when the subclass
        has custom keyword arguments that are needed at instantiation.

        Must return a ``dict`` that will be provided as kwargs to the new
        instance of ``Rule``, following the initial ``self.rule`` value which
        is always provided as the first, required positional argument.
        """
        kwargs = super(Rule, self).get_empty_kwargs()
        kwargs['readonly'] = False
        return kwargs

indeed propagates the setting and activation succeeds. So probably get_empty_kwargs should be used on instancianting rule.empty()
https://github.com/fulfilio/nereid/blob/3.4/trytond_nereid/website.py#L400