Re: Some questions about file handling + some other things

Hi Ralf:

In message <[email protected]>,
Ralf Schlatterbeck writes:
>On Wed, Mar 24, 2021 at 12:55:12AM +0100, Nagy Gabor wrote:
>> The sorted method of Multilink properties (provided by the cgi engine),
>> does not always work as expected. First, I got Python error on
>> context.files.sorted('filetype'), when the 'files' list had an item
>> with 'filetype' unset.
>
>Sorting by Multilink happens in Python not in SQL. What is your use-case
>for sorting by Multilink? In my experience the sort order created by
>this is hardly understandable by humans.

I don't think this is sorting by multilink but sorting the items in a
multilink. At least thats how I read cgi/templating.py:
MultilinkHTMLProperty::sorted().

>I would like to deprecate its use.

IIRC there was either a bug report or email thread about sorting by
multilinks (as opposed to sorting the elements of a multilink). The
original design doc calls for sorting by len(multilink) IIRC. I don't
know what sorting by the multilink prop does currently.

I'll have to see if I cand dredge it up. IIRC we came up with a use
case for this which was saner than the current sorting method.

>I also at one time wanted to implement key properties with multiple
>values: An application often demands uniqueness over several properties
>not just one. I discussed this *many* years ago with Richard but he
>feared at the time that things would be complicated by this. I still
>think it would be a useful feature.

I would tend to agree it's useful. Maybe a key() function that is
passed the item? Could be materialized in a _key hidden/reserved
property name similar to creator/activity....

>> Second try: I do two database query for tasks (the first
>> one filters on 'deadline is set', and an other one filters on 'deadline
>> is not set', and join these list.
>
>Yes, this can be done in an explicit index template if you really need
>that behavior.

Do you have an example? I envision some sort of concatenation of id's
that result from a search that are sent into request/batch somehow.

--
				-- rouilj
John Rouillard
===========================================================================
My employers don't acknowledge my existence much less my opinions.