Arguments that can be set in Power Apps (V2) triggers can be “Optional (optional)”.
The argument can be made optional by selecting “Make the field optional” from the menu.
This time, using that optional argument, we created a flow that returns the string if the “str” argument is set, and returns the message “not set” if the “str” argument is not set (when null).
Works when called with arguments
First, let’s call this flow from the Power Apps side with set arguments,
The article says that you can put the “?” operator in the triggerBody expression when referencing optional arguments. operator in the triggerBody expression when referring to optional arguments.
triggerBody()[‘argument name’]
↓
triggerBody()?[‘argument name’]
So the expression that calls the argument “str
Added “?” operator is added.
Save the flow and run it again,
It worked successfully!
Operator “?” in JSON
It seems that using the “?” operator to return “null” instead of “error” if the referenced field does not exist.
So this time, when I called without setting any arguments, Power Automate seemed to work correctly because it treated the call as “null” instead of an error in the flow.
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