I want to erase the set value of a Reference type flow variable in Flow Designer.

[ymmt]

Thanks for taking a look.

I would like to erase the value set for a flow variable of type Reference in Flow Designer so that nothing is set.

To date, I have tried the following methods, none of which have worked.

(1) I tried to erase the set values by leaving the data field blank in "Set Flow Variables" in Flow Logic.
(2) In "Set Flow Variables" of Flow Logic, I tried to overwrite the set value with undefined by setting "return undefined;" to "Togle Scripting".

If the flow variable was a string type flow variable, I could set it to "undefined" by the method (2), but I could not achieve this with the Reference type flow variable.

Please let me know if you can shed any light on this.

Thank you in advance.

[DrewW]

Have you tried setting the value to the string "NULL"?

[ymmt]

Thanks, DrewW!

I tried to set "NULL" in the string, but it had no effect.

In step 5 of the attached image, I set "NULL" in Togle Scripting for the flow variable User.
After that, I put the value of the flow variable into the Message of the log output action, and it seems that the value is not lost and I am able to get the User ID.
*Incidentally, when I tried "return NULL;" instead of a string, I got a ""NULL" is not defined" error.

If I am doing something wrong, I would appreciate a hint.

Thank you in advance.

[DrewW]

In a script did you try and return an empty string?

[ymmt]

Thanks, DrewW.

Sorry for the delay in replying.

I tried the following in Toggle Scripting, but none of them worked

• return;
• return "";
• return NULL;
• return "NULL";
• return null;
• return "null";
• return undefined;
• return "undefined";

We also tried the same pattern as return with the following statement, which also had no effect.

• fd_data.flow_var.group = "null";

Thank you in advance.