Question of :filter operator and sort

[Mohammad Rahmani]

I use a :filter to sort tiddlers based on the values in their fd field

<$list filter="[tag[fsort]] :filter[get[fd]nsort[fd]]">

</$list>

This does not work! Why?

Reproduce

1. drag and drop attached json to https://tiddlywiki.com/prerelease/

2. open the Test of :filter

Best wishes

Mohammad

[Mohammad Rahmani]

I know my question has the below answer

<$list filter="[tag[fsort]sort[fd]]">

</$list>

But I am working on :filter and I want to know how it works in different situation!

Best wishes

Mohammad

[Mohammad Rahmani]

In tiddlywiki.com

The filter operator runs a subfilter for each input title, and returns those input titles for which the subfilter returns a non-empty result (in other words the result is not an empty list). The results of the subfilter are thrown away.

Does this mean results are returned one by one and we cannot do an operation like sort?

Best wishes

Mohammad

On Tue, May 18, 2021 at 4:34 PM Mohammad Rahmani <mohammad...@gmail.com> wrote:

[Saq Imtiaz]

 

Does this mean results are returned one by one and we cannot do an operation like sort?

Yes,correct. For sorting from 5.1.24 you can use :sort

https://tiddlywiki.com/prerelease/#Sort%20Filter%20Run%20Prefix

 

[Mohammad Rahmani]

Saq,

 Thanks a million!

I need to practice more with :filter and learn!

Best wishes

Mohammad

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[Saq Imtiaz]

The simplest way to look at :filter is that it removes the input titles for which the :filter run returns no result.

That is all that it does. 

[Mohammad Rahmani]

On Tue, May 18, 2021 at 4:53 PM Saq Imtiaz <saq.i...@gmail.com> wrote:

The simplest way to look at :filter is that it removes the input titles for which the :filter run returns no result.

That is all that it does. 

I got it! Much appreciated!

 Actually it is very semantic :filter those do not meet the criteria given inside the :filter[]

I will document this!

On Tuesday, May 18, 2021 at 2:21:52 PM UTC+2 Mohammad wrote:

Saq,

 Thanks a million!

I need to practice more with :filter and learn!

Best wishes

Mohammad

On Tue, May 18, 2021 at 4:45 PM Saq Imtiaz <saq.i...@gmail.com> wrote:

 

Does this mean results are returned one by one and we cannot do an operation like sort?

Yes,correct. For sorting from 5.1.24 you can use :sort

https://tiddlywiki.com/prerelease/#Sort%20Filter%20Run%20Prefix

 

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[Saq Imtiaz]

@Mohammad if you feel we could rephrase the documentation to make this clearer, please do make a PR.

[Mohammad Rahmani]

Hi Saq,

On Tue, May 18, 2021 at 6:04 PM Saq Imtiaz <saq.i...@gmail.com> wrote:

@Mohammad if you feel we could rephrase the documentation to make this clearer, please do make a PR.

I am experimenting with some new filter operators and I would absolutely be happy to help here!

To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/2952c88e-cfbc-4f1f-b98f-5c0e83986522n%40googlegroups.com.