Every Whose - What am I doing wrong

Scripting Forums AppleScript | Mac OS X
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#1

Hey everyone, newish question here. I’m trying to write a script for iTunes that will take the user’s selected tracks and filter out those whose date fall after a certain year. Right now I’m starting smaller and trying to filter out track’s whose year is2007. The every whose clause seems appropriate here but I can’t get teh script to compile. Here is my code:


tell application "iTunes"
	get selection -- Returns a list whos contents are type "File Track"
	get file tracks of the result whose (year of it is equal to 2007) -- Tracks have a year property and this property holds an integer.
	--Do Stuff Here to the resulting items
end tell

When I compile it says “Can’t get {} whose year = 2007”

What am I doing wrong? Thanks

#2

Hi,

the whose filter doesn’t work in almost all “custom” lists.
Use a repeat loop


tell application "iTunes"
	set L to {}
	repeat with i in (get selection)
		if year of i is 2007 then set end of L to contents of i
	end repeat
	L
	--Do Stuff Here to the resulting items
end tell
#3

I haven’t tested this (and I don’t script iTunes) but usually when you say “it” in a script it refers back to the current tell block you are in. I believe you are telling it to look at the “year of iTunes”.

maybe:

get file tracks of the result whose year is equal to 2007

I don’t know iTunes but 2007 may need to be in quotes - “2007”.

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#4

@StefanK - I can’t use every/whose on lists with content I’ve created? How do I know when I can and can not use every/whose?

#5

I guess, it doesn’t work at all in custom created lists like selection

#6

whose filters are for references, not lists.

Compare:

tell application "iTunes"
	set test to file tracks of library playlist 1 whose year is equal to 2007
end tell

tell application "iTunes"
	set test to every track of library playlist 1
	-- test is now a list
	
	set test to file tracks of test whose year is equal to 2007
end tell

I believe the common problem with selection is that it is a property of the application object (which happens to return a list).

See also: Filter

#7

Interesting. Thanks for clearing that up. i have one more question though. As I noted before I am writing a script to archive my podcasts. I have also read an every/whose clause is much faster than a repeat loop and should be used when ever possible. Is it better form to use whose clauses to filter out the tracks that are podcasts and fall within a certain date range? Or should I just get the selected tracks from iTunes and use repeat loops to filter out what I don’t want?

#8

I recommend to create a smart playlist to filter the tracks and then process only this playlist

#9

The updated Language Guide says it even better: