On Jun 30, 2011, at 9:23 AM, Adrian wrote:
SQAlchemy 0.7.1 / pyscopg 2.2.1 / PostgreSQL 9.0
---
I have a weird problem with orm queries that contain custom functions,
in this case from postgres contrib modules. When I do a query like
this
session.query(Entity, func.similarity(Entity.string,
'querystring')).all() # postgres pg_trgm extension
I will get the error below. However, when I specify one or all the
columns of the Entity individually it works. It also works if the
function is in the .order_by() clause.
Any ideas where the problem could come from?
this seems like it has to do with the type of object being returned from
psycopg2, as the Query runs the rows through a uniquing function that uses
sets, maybe a comparison is emitting that TypeError. The stack trace doesn't
quite make it clear. It would be interesting to see what
session.execute(myquery.statement) sends back in the result rows. (I haven't
looked up the SIMILARITY function in the PG docs yet to see what it returns).
-
/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.pyc in
all(self)
1675
1676
- 1677 return list(self)
1678
1679 @_generative(_no_clauseelement_condition)
/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.pyc in
instances(self, cursor, _Query__context)
1916
1917 if filter:
- 1918 rows = filter(rows)
1919
1920 if context.refresh_state and self._only_load_props
\
/usr/local/lib/python2.7/dist-packages/sqlalchemy/util/
_collections.pyc in unique_list(seq, hashfunc)
594 if not hashfunc:
595return [x for x in seq
-- 596 if x not in seen
597 and not seen.__setitem__(x, True)]
598 else:
TypeError: an integer is required
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