I attached a script that reproduces the problem. It actually only happens
if the metadata contains a schema, then the tablename in the INHERITS()
clause get quoted, which causes the problem.
On Monday, November 23, 2015 at 7:13:27 PM UTC+1, Adrian wrote:
>
> I actually I just found the problem; the tables are in fact created in the
> right order - the problem is that the DDL contains INHERITS ( "parent" ).
> It gives the same error if I try to run the code in a GUI with the
> inherited table name quoted, without (the quoting) though it works.
>
> On Mon, Nov 23, 2015 at 6:55 PM Mike Bayer <mike...@zzzcomputing.com>
> wrote:
>
>>
>>
>> On 11/23/2015 12:43 PM, Adrian wrote:
>> > Hello,
>> >
>> > I have the following problem - I recently upgraded to the 1.0+ branch
>> > from 0.9 and now the PostgreSQL table inheritance does not work properly
>> > any longer because the tables that inherit from the master table are
>> > sometimes created before (random) the actual table they inherit from,
>> > throwing (psycopg2.ProgrammingError) relation "<table>" does not exist
>> > errors. With the 0.9+ branch a simple add_is_dependent_on was working to
>> > solve this but it does not seem to be taken into account anymore.
>>
>> this is not the case, that API is still taken into account. I can
>> remove the code that does so and the test which exercises this feature
>> then fails, so it is also tested.
>>
>> Can you please provide a full reproducing test case? It needs to be
>> succinct, single file, and runnable by me, thanks.
>>
>>
>>
>>
>> Is
>> > there something that changed from 0.9 to 1.0 that needs to be done to
>> > get it to work? metadata.sorted_tables returns the proper table order
>> > (master table first, dependencies later) though but tables are not
>> > created in that order by metadata.create_all().
>> >
>> > Thanks,
>> >
>> > Adrian
>> >
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from sqlalchemy import create_engine
from sqlalchemy.types import String
from sqlalchemy.engine.url import URL
from sqlalchemy import MetaData, Table, Column
url = URL(drivername="postgresql+psycopg2", username="",
password="", host="localhost", port=5432, database="")
engine = create_engine(url, echo=True)
metadata = MetaData(bind=engine, schema="myschema")
parent = Table(
"parent", metadata,
Column("foo", String(4), nullable=False),
prefixes=["UNLOGGED"])
child = Table(
"child", metadata,
Column("bar", String(4), nullable=False),
postgresql_inherits=parent.fullname,
prefixes=["UNLOGGED"])
child.add_is_dependent_on(parent)
metadata.drop_all(checkfirst=True)
metadata.create_all(checkfirst=True)
