Re: Format fields in list, but keep sortable?

[philomat]

Chris: Sure, there's that possibility – however, I think it would be
very bad practise to insert a redundant field like this, just for
formatting matters. Also, one might want the option of using localised
units, etc.

Shawn: Of course you are generally correct and I know that the core
developers keep reminding everyone of this fact. However, they
themselves have implemented a lot of "niceness" in the admin lists
(boolean icons, date formatting etc), so I think this trivial
formatting matter is not about going beyond the scope of the admin.
Also, rewriting the whole admin application just because you want to
format some fields in a different way would be a bit exaggerated.
Also, I don't think you have to call yourself lazy for making the most
of what's already there.

I suppose there is not a really easy way, then.

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Re: Format fields in list, but keep sortable?

[Shawn Milochik]

Bear in mind that the admin has a limited scope. This is intentional. It was 
meant to be a friendly replacement for having to hit the Postgres/mySQL command 
line interface, and that's about it. It's trivial to create your own form for 
dealing with your model which can be customized in any way you like. This is 
not intended to be a snarky response. Partially it's a PSA, and partially a 
reminder to myself; the admin is so great that it makes me lazy, and I end up 
living without some really convenient functionality because the admin "almost 
does it."

Shawn

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Re: Format fields in list, but keep sortable?

[Chris Lawlor]

You could add a field to store the calculated size, and override the
model's save method to perform the necessary calculation. Something
like:

def save(self, force_insert=False, force_update=False):
self.size_formatted = self.width * self.height // or whatever your
calculation actually is
super(ModelName, self).save(force_insert, force_update)

Be sure to replace 'ModelName' with the name of your model.

On Dec 8, 7:18 am, philomat  wrote:
> Hi,
>
> I keep numeric fields like "size", "width", "height" in my database.
> In the admin, I want to render them in a friendly format and attach
> units like "KiB" or "pixels" to them when showing them in the change
> list. I know this could easily be achieved by adding callables such as
> "size_formatted" etc to list_display. However, these are no longer
> sortable.
>
> Is there a way around this limitation?

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