Mohammad,
Well, Michaelha hasn't confirmed that it works yet!
What I did was to test a similar scenario in my own TiddlyWiki.
I have a bunch of books tagged *book*, that have an *author* field, and a
(publication) *year* field.
Some authors have multiple books.
So I tried to list my books so that it sorted first by the Author name (
*author* field), then subsorted the books of an author by the date of
publication (*date* field).
The below did it quite nicely!
<table>
<$list filter="[tag[book]each[author]get[author]sort[]]">
<$list filter="[tag[book]field:author<currentTiddler>sort[date]]">
<tr>
<td>
//<$link to={{!!title}}><$view field="title"/></$link>//
</td>
<td>
<$view field='author'/>
</td>
<td>
<$view field='date'/>
</td>
</tr>
</$list>
</$list>
</table>
\define Explanation()
The 1st *$list* filter:
- Gets a list of all my books (tagged *book*)
- Looks at the *author* field and gets a list of authors using the *get*
operator
- Since the *get* operator is one of the few operators that allow
duplicates, it is possible to have the same author listed multiple times
in
the list created
- So I first use the *each* operator to ensure unique items (authors).
- Then this list of all authors is sorted by the author's name
- As we know, *sort[] *sorts by *<<currentTiddler>>* which at this
point is the author's name in the *author* field
The 2nd *$list* filter will now run for each author in the list created by
the 1st *$list*
- For the first item (*<<currentTiddler>>* - which is the first author's
name)
- It first gets a list of all the books (tagged *book*)
- Then looks at the *author* field - selects the ones that match this
first author (*<<currentTiddler>>*)
- Then sorts those ( *sort[date]* ) by the publication date (*date*
field)
- Then it does that for the 2nd author in the list provided by the 1st
*$list* filter
- . . . and so on for all the authors one by one as provided by the 1st
*$list* filter.
\end Explanation
I now have a nicely tabled list!
I'm glad Michaelha asked the question, as I like the way all my books are
listed now.
Cheers
On Monday, April 1, 2019 at 11:59:36 AM UTC+7, Mohammad wrote:
>
> S.S,
> What does each operator do here?
>
>
>
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