On Fri, 2007-05-18 at 23:50 +0200, Olivier Guilyardi wrote:
> Hi,
>
> How can I know about the limiting parameters inside a custom manager method?
>
> Example:
>
> class MyManager(models.Manager):
> def my_query(self):
> # How can I find out about offset and length ?
> cursor.execute("SELECT foo FROM bar LIMIT %d, %d", [offset, length])
>
> class MyModel(models.Model)
> foo = models.CharField(maxlength=200)
> my_objects = MyManager()
>
> # The following should result in offset=0 and length=5 above
> first_rows = MyModel.my_objects.my_query()[:5]
>
> Is this possible?
Not really, no. Python will process the slice arguments ("[:5]") after
it has called my_query().
The way we work around this in QuerySet is to ensure that every QuerySet
method (with a few exceptions) returns another QuerySet and we implement
__getslice__ on the QuerySet class. You would need to emulate that
behaviour if you really wanted this.
Regards,
Malcolm
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