[Sqlalchemy-tickets] Issue #3998: Problems using automap_base with DB2-s SAMPLE DB (zzzeek/sqlalchemy)

[Krzysztof M. <iss...@bi...>]

New issue 3998: Problems using automap_base with DB2-s SAMPLE DB
https://bitbucket.org/zzzeek/sqlalchemy/issues/3998/problems-using-automap_base-with-db2-s

Krzysztof Malinowski:

Using the official docker form IBM:

https://hub.docker.com/r/ibmcom/db2express-c/


```
#!bash

docker run -it -p 50000:50000 -e DB2INST1_PASSWORD=mypass -e LICENSE=accept ibmcom/db2express-c:latest bash

# create db
su - db2inst1
db2start
db2sampl

```

python requirements:
```
#!
sqlalchemy==1.0.17
ibm-db==2.0.5.1
ibm_db_sa==0.3.2
```
(btw. tried this with the newest versions also - same result)

OS:

```
#!
Ubuntu 14.04 64bit
```

Doing:
```
#!python
from sqlalchemy.ext.automap import automap_base
from sqlalchemy import create_engine

Base = automap_base()
engine = create_engine("db2://db2inst1:mypass@172.18.0.1:50000/SAMPLE")
Base.prepare(engine, reflect=True)

```
raises:

```
#!python

Traceback (most recent call last):
  File "db2_automap.py", line 8, in <module>
    Base.prepare(engine, reflect=True)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/automap.py", line 777, in prepare
    generate_relationship)
  File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/automap.py", line 899, in _relationships_for_fks
    nullable = False not in set([fk.parent.nullable for fk in fks])
AttributeError: 'NoneType' object has no attribute 'nullable'
```

seems that some fk-s have incorrect *parent* and *column* attributes