On 15 Oct 2008, at 3:27 pm, bruno desthuilliers wrote:
> I could be (and I strongly suspect it would be), but I really can't
> tell for sure. Now this should be easy to find out, isn't it ?-)
The csv module gave a slight speed increase (enough for me to notice
without any profiling or accurate timing
> There are also a couple micro-optimization tricks, like correct use of
> select_related, aliasing of frequently accessed attributes and methods
> outside a loop, etc, - so we could eventually help a bit if you post
> your code - but anyway : unless you do something very obviously wrong
> in your view, trying to optimize without first profiling is usually
> (from experience) a waste of time.
>
> You could at least benchmark the view code *without* the template
> rendering to find out weither the main bottleneck is in the view code
> itself or in the template.
I think I can see the problem...
I have the following:
class Contact(models.Model):
# Basic contact details
class AddressBook(models.Model):
contact = models.ForeignKey(Contact)
# Various address fields
class ContactMembership(models.Model):
customer = models.ForeignKey(Contact)
# Membership specific details
The csv generator is being fed a list of ContactMembership objects,
it is then looking up the Contact details and AddressBook details.
I can reduce queries slightly by using select_related(), but this
doesn't pull in the AddressBook model details, so a query is run for
each row as it is added to the csv output to get the Address details.
Is there anyway I can optimise this with the ORM or am I looking at
writing some custom SQL or denormalising the data?
Thanks for any advice you can give.
--
David Reynolds
[EMAIL PROTECTED]
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