use func.abs(q.address.lat) for the ABS function.
On Jan 31, 2007, at 4:24 PM, Brent Pedersen wrote:
>
> hi, i've got it this far now. but it doesnt like the q.address.lat/lon
> since it makes an alias in the join. how to i get at that alias?
>
>
> sajoin = q.join_to('address')
> sorder = "ABS(" + str(q.address.lat) +" - %f) + ABS(" +
> str(q.address.lon) +" - %f)"
> sorder %= (lat,lon)
> return q.select(
> sajoin
> ,order_by=asc(sorder)
> ,limit=800
> )
>
>
> On 1/31/07, Brent Pedersen <[EMAIL PROTECTED]> wrote:
>> hi, how can put custom sql in a query? specifically in this code? the
>> problem is with the order_by. i want to pass it some custom sql:
>>
>> q = session.query(Student)
>> sajoin = q.join_to('address')
>>
>> return q.select(
>> sajoin,
>> order_by="(ABS(address.lat - %s) + ABS(address.lon - %
>> s))"
>> % (lat,lon)
>> ,limit=800
>> )
>>
>>
>>
>> that doesnt work . this does:
>> order_by=asc((address.c.lat - lat) + (address.c.lon - lon))
>>
>> but it's not quite what i need--the manhattan distance....
>> and i'd like the results to be in my mapped objects so
>> i can still do
>> student.address.lat, etc.
>>
>> i've scoured the docs, but maybe i've missed something.
>> any pointers?
>> thanks.
>> -brent
>>
>
> >
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