Your example is missing a bracket. I think I would expect this to work:
for position, in
session.query(Position.position).filter(func.length(Position.position)
== 2):
print(position)
If it still doesn't work, can you show the query that it's generating?
Simon
On Tue, Jul 30, 2019 at 4:53 AM James Hartley wrote:
>
> Perhaps I have been up too many hours, but my syntax foo is fizzling. Given
> the following class, I want to compute the string length of "position"
> instead of storing it as another attribute which can get out of sync. eg.
>
> class Position(Base):
> __tablename__ = 'position'
> id = Column(INTEGER, primary_key=True)
> timestamp = Column(TIMESTAMP, nullable=False)
> position = Column(TEXT, unique=True, nullable=False)
>
> So to get all positions of string length 2, the following is not working:
> from sqlalchemy.sql.expression import func
> # ...
> for position, in
> session.query(Position.position).filter(func.length(Position.position == 2):
> print(position)
>
> Any insight offered would certainly be appreciated.
>
> Thanks!
>
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> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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