Get the last playlist of a folder in iTunes

I think you're misinterpreting the inheritance model here. At its lowest level, pretty much everything is an item, but that just gives objects a common framework for giving them names, IDs, classes, etc. You rarely (if ever) directly interact with the item class itself.

In the case of folder playlists, it's not clear to me a) what it is you're trying to do, or b) how you're invoking this (and, by extension, what the input to your Automator action is. However, if I look directly at your question:

I'd like to get the last playlist of a folder playlist in iTunes

That's pretty trivial:

tell application "iTunes"

get last folder playlist

end tell

(but bear in mind, the actual definition of 'last' is undefined here - it could be the 'last created', or 'last by alphabetical order', or even 'last played'.)

I suspect there's more to your goal here, though, so what is your actual plan here?

Hi,

To get the last user playlist from a folder :

on run {input, parameters}
    tell application "iTunes"
        set folder_p to item 1 of input
        set userPlaylists to user playlists
        set tc to count userPlaylists
        repeat with i from tc to 1 by -1
            set p to item i of userPlaylists
            try
                if (parent of p) = folder_p then return p -- the last user playlists at root of folder_p
            end try
        end repeat
    end tell
end run

To get the first user playlist from a folder :

on run {input, parameters}
    tell application "iTunes"
        set folder_p to item 1 of input
        set userPlaylists to user playlists
        repeat with p in userPlaylists
            try
                if (parent of p) = folder_p then return contents of p -- the first user playlists at root of folder_p
            end try
        end repeat
    end tell
end run

If this folder playlist contains other folders, and you want to get a playlist in a subfolder, this requires another script.

Hi,

Combo wrote:

Thx a lot, it works !

But is it mandatory to do a loop in all the user playlists ?

Yes, the loop is needed.

The AppleScript action get the output of "Obtenir les éléments iTunes indiqués" action"

The output is in the input variable, this variable is always a list.

folder_p is the first and unique element in the input variable --> the folder playlist "Juke Box"

To get an user playlist in the the folder playlist "Juke Box", the script need to check the parent in all the user playlists

Because these syntaxes are not working :

return playlists of folder_p -- this return a empty list
return user playlists of folder_p -- this return a empty list
return folder playlists of folder_p -- this return a empty list

You can use a filter like this :

return playlists whose name contains "CD " -- this work
return user playlists whose smart is true -- get smart playlists, this work

But it doesn't work with the parent property

return playlists whose parent is folder_p -- error