I get an AttributeError: 'list' object has no attribute 'model'
Is there a way to circumvent this, or should I try to do something
involving a generic relationship for the models (i.e., a model with
almost nothing to it, to which all the other models have a generic
relationship)? Will that kind of thing work? (At this point, I can't
seem to wrap my head around generic relationships, which is why I
wanted to explore other options.
On Aug 22, 4:23 pm, Doug B <[EMAIL PROTECTED]> wrote:
> q = list(a) + list(b) + list(c)
> q.sort('-date')
>
> The problem you have here is the q.sort() method doesn't understand
> how to compare your objects. '-date' means nothing to it. I'm
> pretty sure you need to write your own comparison function and pass
> that to sort. If you've got models with the same field name to sort
> by, you can use operator:
>
> import operator
> sorted_list=sorted(q,key=operator.attrgetter('modified'))
>
> If you've got to inspect the object and 'guess' the date sort field,
> or have different field names to use, I think the only way to do it is
> with your own comparison function.
>
> def cmp_date_field(x,y):
> # do some model inspection to find attribute name to use for date
> comparison
> xdate=getattr(x,datefield_x,None)
> ydate=getattr(y,datefield_y,None)
> if xdate> ydate: return 1
> elif xdate==ydate: return 0
> else: return -1
>
> q.sort(cmp_date_field)
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