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euanjfc
Frequent Visitor

How to add a new property to an object-type variable in Apply to Each?

Hi

 

Inside an Apply to Each loop's Data-Compose action, if I add an expression using 'addProperty' to add a dynamically created key and value (both created using the loop item data) the object variable remains empty after the loop.

 

An example of the addProperty withing the Data-Compose action might be:

addProperty(variables('obj_var'), item()['key'], item()['value'])

On the loop completing the Data-Compose action Output contains an array of objects each containing a single property, rather than my hoped for single object containing the comma seperated list of key:value property pairs eg.

{ "name":"John", "age":30, "car":null } 

 

Is it possibe to add dynamically created key:values using addProperty to an object variable within a loop?

 

Thanks

7 REPLIES 7
v-yuazh-msft
Community Support
Community Support

Hi @euanjfc,

 

Could you please share a screenshot of the configuration of your flow?

Could you please share more details about your scenes?

 

I have made a test on my side and I couldn't find a way to add dynamically created key:values using addProperty to an object variable within a loop.

 

Please share more details so we would try to provide a proper workaround for you.

 

Best regards,

Alice

Hi

 

Image of example flow  below. The addProperty expression is -

addProperty(variables('obj_var'),item().item.key,item().item.value)

Example flow

 

and the final Compose output when run shows the empty object variable and the Compose output with an array of objects:

{} [{"key1":"value1"},{"key2":"value2"}]

Thanks

The addProperty()  returns a new object.  It doesn't update the variable referenced by the first object.  You have to assign a second object variable the output from addProperty(variable('obj_var'), item().item.key, item().item.value).  Then assign that second variable back to 'obj_var'.  Flow won't let you assign directly to the same var.

Here is a screen shot of my flow.  Configuration is the variable I want to get the new properties. (basically the same as your obj_var)

 

2019-02-16 14_35_26-.png

This is great, but what are the bottom two variable actions? Append to array doesnt work if you have defined an object...

Can you please expand and maybe explain a little more? @JeffCGrd 

I am doing it the other way round. In a loop of items that I want to append to my object, I'm first using "union" function together with the "addProperty" and then "Set variable" so that ma unioned object is updated:2019-03-01_11h51_53.pngThe "union" operation looks as below:

union(addProperty(variables('var_TempSubscInstanceName_dict'),item()?['Id'],item()?['Name']), variables('var_SubscInstanceName_dict'))

So in the end it is joining together a new object created by "addProperty" and the existing object initiated as variable.

Next I am simply updating (Set variable) my object with the result of the union operations.

 

Regards,

Tomasz

 

 

 

Sorry for the late response.  My companies spam filter was catching these notifications.


@LorenEdgell_HEI wrote:

This is great, but what are the bottom two variable actions? Append to array doesnt work if you have defined an object...

Can you please expand and maybe explain a little more? @JeffCGrd 


They are just "Set Variable".  The variables are initialized as Object type.  AddProperty() returns an object and it is assigned to tmpObj.  Then because I want the final values in the configuration variable, I set configuration to the value in tmpObj.

I know this was written 4 years ago, but I hope you might see this!  Do you actually need the union() command?  If addProperty() returns a new object with the new property added to it, doesn't that already achieve what you're trying to do?

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