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Approve/ Reject - First expression

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Posted on by smather

Hi there

I'm using the first() expression in a flow when it comes to Approve/Reject because I want to avoid Apply Each. The expression I used is this:

first(body('Freelancer_Approval')?['body/responses'])

and this is the error message I got:

Unable to process template language expressions for action 'Approved_or_Denied' at line '0' and column '0': 'The template language function 'first' expects its parameter be an array or a string. The provided value is of type 'Null'. Please see https://aka.ms/logicexpressions#first for usage details.'.

I've successfully used first(body('Freelancer_Approval')?['responses'])?['comments'] to get the comments, but I'm unsure as to where I'm going wrong here with the response. Any help would be awesome.

I'm using it in a condition as in if EXPRESSION is equal to Approve; if yes, do that, if no then do that.

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MarconettiMarco 3,812 Super User 2024 Season 1 on at

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Hello @smather ,
in the "Create an approval" action you should be able to select the "Approve/Reject - First to Respond:

In that way you can easily avoid the Apply to each control.

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BR,
Marco

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smather 56 on at

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Hi @MarconettiMarco

That is the one I already have, but it still forces my flow to have an Apply Each if I use the field directly from Approve/Reject, which is why I've gone this route.

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MarconettiMarco 3,812 Super User 2024 Season 1 on at

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ok, if you can, share the output of the action "Freelancer_Approval" from where you want to grab the first value.

BR,
Marco

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smather 56 on at

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Hi @MarconettiMarco

Not sure what you mean, but hopefully the screenshot helps?

the expression in the condition is first(body('Freelancer_Approval')?['body/responses'])

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MarconettiMarco 3,812 Super User 2024 Season 1 on at

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Hi @smather
you should be able to run the flow and get the output from the "Freelancer_Approval" action.
Anyhow, yon can also, after the "Freelance_Approval" action, add the "Compose" action and insert the following expression:

first(variables('Freelancer_Approval'))

then you have to add "Parse JSON" action using the Compose output value. In this way you should be able to get all the values from the first item in order to add them in the next actions.

If I have answered your question, please mark your post as Solved.
If you like my response, please give it a Thumbs Up.

BR,
Marco

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smather 56 on at

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Hi @MarconettiMarco -- just an additional clarification question, sorry! In the Parse JSON, what's the required schema?

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MarconettiMarco 3,812 Super User 2024 Season 1 on at

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Hi @smather ,
keep the outputs from the Compose action (so first you need to run the flow):

then copy and paste it into the "Generate from Sample" function in the "Parse JSON" action (the Content must be the "Compose" outputs:

and click "Done":

So in the next Actions/Controls you should be able to get the value you want.
Please let me know.

BR,
Marco

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smather 56 on at

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Hi @MarconettiMarco

Thank you! But it seems to spit out an error when I try to run it:

Flow save failed with code 'InvalidVariableOperation' and message 'The inputs of workflow run action 'Compose' of type 'Compose' are not valid. The variable 'Freelancer_Approval' must be initialized before it can be used inside action 'Compose'.'.

I put the Compose action directly before the condition

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MarconettiMarco 3,812 Super User 2024 Season 1 on at

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Please share the screenshots.

BR,
Marco

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smather 56 on at

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This is what the flow looks like in its entirety

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