for a selected file trigger and empty value with non existing variable in json

[fsim]

Hi there !

So I built a low using this trigger. it's an approval flow, so I request an approver, a comment, a couple of date. The caller can also fill in an optional email  account who should be aware of the approval. 
Then, in the flow I update the Sharepoint library with the data the user filled in. 

Unfortunatelly, If the optional email is left blank, it generate an error. "Bad template. email2 variable don't exist..." (see picture below)

In fact the trigger do not create an internal Variable in the JSON for the non filled-in fields.

How can I manage this ? How can I test if the user filled in a field ? Because as soon as I try to refer to it, if it's empty, it failed the flow.

[manuelstgomes]

Hi @fsim 

Somewhere in the "Update file properties 4" you have a "email_2", but if you look at the JSON there is no field with that name. Do you mean "email_1"?

Cheers
Manuel

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[fsim]

@manuelstgomes thanks for your answer

That's exactly my point: Email_2 will only be in the json if the user filled in the "optional Email" field.

So I need to check prior the update if the email box was filled or not.

[manuelstgomes · Accepted solution]

HI @fsim 

Makes sense. Let's try the following. Create a condition where the left side you have the following formula:

empty(triggerBody()?['email_2'])

and in the right equals to true.

Can you please check if and let me know if you have any questions?

Cheers
Manuel

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[fsim]

@manuelstgomes 

indeed the  empty () function did not crash the flow despite the email_2 did not exist !
So I'm good to create 1 variable per field, and update these variable with the value of the fields when they are filled in and with blank() when they are not. 
Then I will use those new variables in my update.

right ?

Or is it a way to put this test directly in the update item ? 

Thanks anyway !

[manuelstgomes]

HI @fsim 

Yeah that works also. Glad it's working.

Cheers
Manuel

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[fsim]

for those hwo might come here:
be aware that  if(empty(triggerBody()['Email_1']),null,triggerBody()['Email_1']) don't work ! Same error than above. You need to use the conditional branch