Building an or_ filter in loop

[Bryan]

I can't figure out a clean way of adding a bunch of filter terms to a
query in a loop joined by an OR clause. Successive calls to filter
join the expressions by AND. I would like to do something like the
following, but have the expressions joined by OR

terms = ['apple', 'orange', 'peach']
q = Session.query(Fruit)
for term in terms:
q = q.filter(Fruit.name.like('%' + term + '%')


Desired pseudo-sql:
SELECT * FROM fruit WHERE name like '%apple%' OR name like '%orange%'
OR name like '%peach%'

[Kyle Schaffrick]

I think this might do what you want:

cond = or_(*[ Fruit.name.like('%' + term + '%') for term in terms ])
q = Session.query(Fruit).filter(cond)

-Kyle

[Bryan]

That worked, thanks

[polaar]

this would even be easier (and correcter if the terms contain "%")
written as:

cond = or_(*[Fruit.name.contains(term) for term in terms])

[Kyle Schaffrick]

On Mon, 11 May 2009 09:01:06 -0700 (PDT)
polaar <steven.v...@gmail.com> wrote:

>
> this would even be easier (and correcter if the terms contain "%")
> written as:
>
> cond = or_(*[Fruit.name.contains(term) for term in terms])
>

Indeed, good catch. I was so interested in the "apply or_" logic that I
missed the escaping bug :)

-Kyle