I have a list of items and I define some way to rank them:
class Item:
name = models.CharField()
project = models.ManyToManyField(Project)
def score(year):
... some intensive computation + queries ...
return result
I'd like to display the items together with their score, and the mean
score and standard deviation:
Items | 2007 | 2006
item1 | 2 | 2
item2 | 1.33 | 3.92
... | ... | ...
Mean (dev) | 1.68 (0.73) | 3.33 (1.54)
I use a tag to compute the score and std deviation for a given year,
but this involves
{% get_score_stats item_list year as mean std_deviation %}
But this involves running the score query again for each item. Also, I
could want to compute other sorts of statistics and then quickly the
number of tags and queries grows up, which is bad.
What's the best way of doing this? Could I use Excel-like macros in
the template?
JJ.
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