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Trouble with HTTP call and parsing JSON

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Posted on by Community Power Pla...

Hi, everyone.

I am not very skilled with JSON. My flow sends an HTTP call (that works), then I parse the JSON (that works), then I have an Apply to Each where I use Features to loop and set different variables (the apply to each works, but the expression in one of my variables does not), then I parse JSON again (that doesn't work).

The Expression in my Set Variable

This works:

if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-CO'), 'Colorado', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-TX'), 'Texas'))

But when I stack it up to include more states, it doesn't work:

if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-CO'), 'Colorado', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-TX'), 'Texas', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-MN'), 'Minnesota', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-WI'), 'Wisconsin', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-MI'), 'Michigan', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-ND'), 'North Dakota', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-SD'), 'South Dakota', if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-NM'), 'New Mexico'))))))))

The error says "Flow save failed with code 'InvalidTemplate' and message 'The template validation failed: 'The repetition action(s) 'Apply to each 2' referenced by 'inputs' in action 'Set_State_variable' are not defined in the template.'.'."

What am I doing wrong in the expression?

The Parse JSON Error

The 2nd parse JSON action doesn't work, either. I get an error that says "Unable to process template language expressions in action 'Parse_JSON_2' inputs at line '0' and column '0': 'Required property 'content' expects a value but got null. Path ''.'."

Here is my flow:

Then right after that I parse JSON again:

What do I have to do differently in the 2nd Parse JSON action? I really don't know what I'm doing wrong.

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wskinnermctc 6,519 Moderator on at

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In your expression example under
This works:
if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-CO'),'Colorado',if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-TX'), 'Texas'))

But when I stack it up to include more states, it doesn't work:
if(equals(items('Apply to each 2')?['attributes']?['POOState'], 'US-CO'), 'Co.....................

Did you stop putting the underscore _ between Apply_to_each_2?

The underscore _ needs to be in the expression for spaces in a step title that is being referenced.

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Community Power Pla... on at

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Yup. That's what I did. I added the underscores back in and ran it, then got this error:

Unable to process template language expressions in action 'Set_State_variable' inputs at line '0' and column '0': 'The template language function 'if' expects three parameter: the condition to test as the first parameter, the value to return if the condition is true as the second parameter, and the value to return if the condition is false as the third parameter. The function was invoked with '2' parameter(s). Please see https://aka.ms/logicexpressions#if for usage details.'.

The flow successfully ran through 2 loops, then threw this error on the 3rd loop. The first Parse JSON action had logic in it to make it work should there be a null value, so I'm not sure why the error.

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wskinnermctc 6,519 Moderator on at

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Can you copy and paste your full if() expression exactly as you have it in your flow? One of the if statements is incorrect or doesn't have a final option.

I'm guessing it is the last if() statement for New Mexico needs a false output. So if it isn't 'US-NM' then what? You'll have to add a comma after 'New Mexico' and put a final option like 'Unknown' or some text.

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Community Power Pla... on at

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No way! Here it is:

if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-CO'), 'Colorado', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-TX'), 'Texas', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-MN'), 'Minnesota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-WI'), 'Wisconsin', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-MI'), 'Michigan', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-ND'), 'North Dakota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-SD'), 'South Dakota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-NM'), 'New Mexico'))))))))

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Community Power Pla... on at

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Yes, that is correct. It needed a final option, so this is what I put:

if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-CO'), 'Colorado', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-TX'), 'Texas', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-MN'), 'Minnesota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-WI'), 'Wisconsin', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-MI'), 'Michigan', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-ND'), 'North Dakota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-SD'), 'South Dakota', if(equals(items('Apply_to_each_2')?['attributes']?['POOState'], 'US-NM'), 'New Mexico', 'false'))))))))

Thank you!

Now we're back to the 2nd JSON action not working. It ran through the loop perfectly, but gave me this error:

InvalidTemplate. Unable to process template language expressions in action 'Parse_JSON_2' inputs at line '0' and column '0': 'Required property 'content' expects a value but got null. Path ''.'.

The JSON in the first action has some failsafes built into it so that it will run should a value be null:

},
"CreatedBySystem": {
"type": [
"string",
"null"
]
},
"IncidentSize": {
"type": [
"number",
"null"
]

Not being familiar with JSON, I am unsure what is supposed to go in the 2nd action.

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wskinnermctc 6,519 Moderator on at

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So the source of "Parse JSON 2" is the variable named "varFeatures"

Where in your flow is the variable "varFeatures" getting populated?
And what is the source of "varFeatures" being populated by?

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Community Power Pla... on at

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Aha! It isn't getting set! It needs to get set in the Apply to Each 2 loop. When I try to add it, it creates another loop where it uses Layers:

When I try to run it, I get this error:

ExpressionEvaluationFailed. The execution of template action 'Apply_to_each_3' failed: the result of the evaluation of 'foreach' expression '@body('Parse_JSON')?['body']?['layers']' is of type 'Null'. The result must be a valid array.

I don't know why the flow insists on throwing another loop within the loop, but it's tried using a Layers loop before. Somehow my manager got the flow to stop doing that and the Apply to Each 2 loop was able to work as it should. I've tried everything to get the flow to stop adding the loop with Layers, but I can't seem to get around it. Also, the varFeatures variable is a string, if that matters.

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Community Power Pla... on at

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It turns out we did not need the second parse JSON action. Because we were able to filter the query in the first parse JSON action, we didn't need the second. That's what was stumping me.

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