On 10/17/2016 03:36 PM, Seth P wrote:
I realize that the orm really wants/needs a table to have a primary key:
http://docs.sqlalchemy.org/en/rel_1_1/faq/ormconfiguration.html?#how-do-i-map-a-table-that-has-no-primary-key
Alas I have to deal with an existing table with no primary key. That
said, it does have a unique constraint on a subset of the columns,
though some of them are nullable (and indeed contain nulls). I've set up
a declarative model with these columns labeled as primary_key=True, and
things seem to work... until they don't, e.g. when calling delete() on
some objects followed by flush():
sqlalchemy.orm.exc.FlushError: Can't delete from table
MY_SCHEMA.my_table using NULL for primary key value on column
my_table.MY_COLUMN_1
I know this is a long shot, but is there any way to tell the orm not to
be such a stickler for detail, and just go ahead and emit the sql? I
dread not being able to use the orm...
that error is there right now because we don't emit the "col IS NULL"
SQL within that section of the persistence code.
took me a long time to find the history on this because I thought it had
been discussed but looks like the answer was "no immediate plans":
https://bitbucket.org/zzzeek/sqlalchemy/issues/2127#comment-9011753
that is, we can't just drop that assertion without adding logic to alter
the SQL for some parameters.
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