On Tue, May 3, 2011 at 4:46 AM, Phui Hock <[email protected]> wrote:
> On May 3, 7:43 am, Russell Keith-Magee <[email protected]>
> wrote:
>> This stems back to the design motivation of Django's template language
>> -- you shouldn't be doing math in the template. Instead, you should be
>> doing your math in the view, and providing the template with a
>> pre-calculated result.
>>
>> So, my inclination would be to say no, this doesn't have a place in
>> the default list of tags.
>>
>> Yours,
>> Russ Magee %-)
>
> The example I provided is a bad one, but the math tag is general
> purpose. It can potentially reduce the number of custom filters or
> amount of work needed in the view function.
>
> Here's another take:
> {% load mathtag %}
> {% with x=request.GET.x y=request.GET.y z=request.GET.z %}
> if x = {{ x }}, y = {{ y }}, {{ x }} + {{ y }} = {% math x y "$1 *
> $2" as result %}{{ result }}<br/>
> if x = {{ x }}, y = {{ y }}, {{ x }} * {{ y }} = {% math x y "$1 *
> $2" as result %}{{ result }}<br/>
> if x = {{ x }}, y = {{ y }}, z = {{ z }}, ({{ x }}^{{ z }}) *
> ({{ y }}^{{ z }}) = {% math x y z "($1**$3) * ($2**$3)" as result %}
> {{ result }}<br/>
> if x = {{ x }}, y = {{ y }}, z = {{ z }}, ({{ x }} + {{ y }}) /
> {{ z }} = {% math x y z "($1 + $2) / $3" as result %}{{ result }}<br/>
> {% endwith %}
>
>
> Given the frequency of such request by other users warrants a re-look
> IMO.
>
Or, in a sane world:
if x = {{ x }}, y = {{ y }}, {{ x }} + {{ y }} = {{ x_plus_y_res }}
if x = {{ x }}, y = {{ y }}, {{ x }} * {{ y }} = {{ x_star_y_res }}
and so on.
There is a reason for view functions, we can express the icky logic
that determines what to display on the page in a nice, concise manner,
and leave the formatting and display of that information to the view
layer.
>From another POV, there is no chance for the designer to screw the
template up and calculate the wrong value, if he is only allowed to
output data.
Cheers
Tom
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