[Sqlalchemy-tickets] Issue #3410: JSONB field doesn't track changes (zzzeek/sqlalchemy)

[Andrey S. <iss...@bi...>]

New issue 3410: JSONB field doesn't track changes
https://bitbucket.org/zzzeek/sqlalchemy/issue/3410/jsonb-field-doesnt-track-changes

Andrey Semenov:

I have a code like this:

```
#!python
    stats = Column(JSONB, nullable=False, default={})
```

then having model object with:

```
#!ipython

In [17]: o.stats
Out[17]: {}

In [18]: id(o.stats)
Out[18]: 4377529152
```

I then modify `stats` column


```
#!ipython

In [20]: o.account_log(log)

In [21]: o.stats
Out[21]:
{'traffic': {'attempt_ts_spawn': 1430474948,
  'confirm_operator_id': 185,
  'confirm_ts_spawn': 1430474948}}

In [22]: id(o.stats)
Out[22]: 4375370840
```

at the end of `account_log` the stats is re-assigned with `copy.deepcopy`, but when doing `Session.flush()` I see no requests done to the server. As I understand sqlalchemy doesn't think there's any change to model made to flush it to server.

How could I ensure the changes are flushed to the SQL server?