> If using autoload=True when defining your metadata, be sure your FK
> constraint names are unique to the schema . PostgreSQL scopes FK
> constraint names to the table, but SQLAlchemy loads them from the SQL
> standard information_schema, which is designed for schema-scoped
> constraint names.
While I don't really understand "PostgreSQL scopes FK constraint names to
the table", I can say that my patch fixing ticket 71 (when can we see it
accepted?) does not load from information_schema and is not schema-scoped:
worst than that! the query looks for the foreign keys (and the tables) using
the function pg_table_is_visible(c.oid):
SELECT conname, pg_catalog.pg_get_constraintdef(oid, true) as condef
FROM pg_catalog.pg_constraint r
WHERE r.conrelid = (
SELECT c.oid FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n
ON n.oid = c.relnamespace
WHERE c.relname = :table_name
AND pg_catalog.pg_table_is_visible(c.oid))
AND r.contype = 'f' ORDER BY 1
I can't see any possible drawback of this feature, that makes it possible to
autoload tables in one schema referencing tables in another schema that is
visible anyhow. If there is a possibility of a mistake this means the table
should be specified by the schema (that's a different issue, anyhow), but
the fk are bound to their tables by r.conrelid = c.oid
sandro
*:-)
> which is news to me; the query used to reflect foreign keys takes
> table name into account, and a unit test which reflects anonymously-
> created foreign keys from two different tables works fine (and always
> has...). can someone illustrate this problem for me ?
--
Sandro Dentella *:-)
http://www.tksql.org TkSQL Home page - My GPL work
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