org-mode capture : dynamic file name

Question

I\'ve seen this:

How to type a dynamic file entry for org capture

but cannot get it to work; I get \"Invalid file location: nil\". Has something changed in

Answer 1

Figured it out ... it is using a backquote instead of a normal quote for the entire capture template block! I missed this because all of the answers I saw had only a single capture template with a backquote in front of it; I tried doing that but this doesn't work if the template is "one of" ...

So here is a snippet a bit richer than those I found; I hope it helps someone else.

(setq org-capture-templates
  `(("t" "TODO" entry (file+datetree "~/Documents/org/tasks.org"  "Tasks")
     "* TODO [#C] %?\n   SCHEDULED: <%<%Y-%m-%d %a>>\n  [%<%Y-%m-%d %a>]\n  %a")
   ("T" "Travel" entry (file+datetree+prompt "~/Documents/org/travel.org")
    "* %?\n  :PROPERTIES:\n  :LOCATION:\n  :END:\n  %t\n  %a")
   ("j" "Journal Note" entry (
               file+olp+datetree
               ,(concat
                 org-journal-dir
                 (format-time-string "journal-%m-%d.org")))
   "* Event: %?\n %i\n  From: %a")
   )
  )

The keys are the backquote ` at the start of the capture template def block, and the comma , before (concat ... ) on the function being called.