can we pass constant to process model as process parameter?

No, passing a reference to a constant as a process variable is not supported. Making this a generic process will not work.

There is no variable type called content constant, so its not possible

Hi [mention:07a26341b0094b23b9aa068de0a694b2:e9ed411860ed4f2ba0265705b8793d05] ,

When you try to pass as mentioned you will get Null as Constant ID in the Update Constants inputs.


So It's not possible to do that thing!

I would as a general rule avoid updating constants and would suggest using a database field instead. Updating a constant creates a new version and having many versions of an object can cause performance issues down the line.

I echo Mathieu's warning that it's a good idea to not update general-use constants procedurally, except in rare special cases where you have a strong reason.  I would point out, though, that the modern version of the Update Constant service actually does have a way to turn off "new versions", i.e. you can force a straight-up overwrite, which could be useful for constants that act merely as flags / toggles, where no version history would ever be relevant or useful.

A while ago I figured out a way to update constant by name (if you have a way of passing a valid constant name into your subprocess) - this uses a combo of tricks to look up the constant's ID (note this requires at least one plugin), and the ID is passed to the smart service in lieu of a direct reference to the constant.  Keeping the new data type in line with the constant you're updating will be up to you - use at your own risk i guess [emoticon:ad09a845b95e4cb28c5d9684a032037c]

extract(
  getcontentdetailsbyuuid(
    getconstantorruleuuidbyname("TEST_CONST_FOR_UPDATE")
  ),
  "Id: ",
  ", Parent:"
)