Template tester: "can be used only in the GUI"?

[ownedbycats]

If I go to Add Books > open the settings for a composite column > right-click 'template' to open the editor and put in:

program: virtual_libraries()

The template value shows:

EXCEPTION: The function virtual_libraries can be used only in the GUI

Is this expected? The message is a bit confusing as I thought GUI was "not server or command-line tools."

[chaley]

Originally Posted by ownedbycats

If I go to Add Books > open the settings for a composite column > right-click 'template' to open the editor and put in:

The template value shows:

EXCEPTION: The function virtual_libraries can be used only in the GUI

Is this expected? The message is a bit confusing as I thought GUI was "not server or command-line tools."

What exactly are you doing? What do you do to get to "Add books > open the settings for a composite column"?

[ownedbycats]

- Right-click column header
- Open 'Add your own column' (This was a typo )
- Find a composite column
- Double-click to open the dialog
- Right-click the template field and open the editor
- Add the code there

[chaley]

Sorry, but it doesn't fail for me.

Running current source, I tried:

1. Starting calibre.
2. Right-click on title's header (for me the first column).
3. Choose Add your own columns.
4. Pick a composite column. I tested both with and without "behaves like tags".
5. Enter "program: virtual_libraries()" into the template in the template editor.
6. Press OK

Works fine. No error message.

I then restart calibre. Again, fine, no error message.

What are you doing different from the above?

[ownedbycats]

I pulled the latest source (most recent commit: 3c5b4bf) before starting again.

The only difference is that the column I was testing with (taglike) already contained virtual_libraries().

I tried adding it to a different column (not taglike) and it still error'd.

I thought perhaps it was because I'd accidentally de-selected all the books but I tried selecting 3 and still got the same message.

[BetterRed]

Could it have anything to do with this transient glitch?



It happens when I start calibre in the Test library or switch to it. As soon I select another book the problem goes away, i.e. VL Vanilla show same content as VL Taglike except its white non-clickable text.

Screenshots of VL Vanilla column and temp VL definitions attached.

@chaley - I can PM you the Test library database if you're interested, I don't regard this as a bug because it's not a real world scenario.

Win 10, Calibre 6.7.1

BR

PS : I did a database restore - glitch persists

[chaley]

Originally Posted by BetterRed

Could it have anything to do with this transient glitch?

Attachment 197348

This can happen if a naked search references a composite column that references virtual_libraries(). What is a naked search? A search for data without a column key or for a column key that doesn't exist, so all columns are searched. You can limit what columns are used for naked searches in Preferences / Searches. If a naked search requires evaluating "virtual_libraries()" as well as a composite column with a template invoking "virtual libraries()" then we have a recursive search.

Yes, this is technical but I don't know how to better describe detecting directed cyclical graphs.

[ownedbycats]

I occasionally get the recursion glitch too, mostly on Read|Unread when starting up -- I'm not sure if there's something wrong with those or whether they're just the first evaluated.

Here's the searches I use for my VLs -- I don't think there's any missing column keys and nothing references virtual_libraries() - I think the only composite referenced is #onkobo, which returns yes/no based on the value of an enumerated column.


Note: readstatus() is a custom template that returns values based on two columns (#percentread and #readinglist).

Currently Reading: template:"program:readstatus()#@#:t:~(currentlyrea ding|toberead)"

Read: template:"program:readstatus()#@#:t:=read"

Unread: template:"program:readstatus()#@#:t:=unread"

Fiction: #booktype:"=Fiction"

Fanfiction: #booktype:"=Fanfiction"

Nonfiction: #booktype:"=Nonfiction"

Comics: #booktype:"=Comics"

Documentation & Manuals: #booktype:"=Documentations & Manuals"

Magazines & Periodicals: #booktype:"=Magazines & Periodicals"

Series: series:true AND NOT #booktype:"~(fanfiction|documentation|magazines)"

Loans: search:"=Is library book"
(saved search: (formats:#=1) AND (formats:overdrive))

eBooks: search:"=Has eBook" AND NOT #booktype:"~(fanfiction|documentation)"
(saved search: NOT formats:"~(overdrive|paperbook)"
OR NOT formats:#=1)

Physical Books: formats:paperbook

On Device: search:"=On Device"
(saved search: ondevice:true OR #onkobo:true)

Cleanup:tags:"=[Cleanup]"

[BetterRed]

Originally Posted by chaley

...

Yes, this is technical but I don't know how to better describe detecting directed cyclical graphs.

Or; don't be lazy by searching for lancet, search for tags:"lancet" instead

BR