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fokumus007
Frequent Visitor

Fill String Array with column of excel file / The template language expression cannot be evaluated because property cannot be selected Array elements can only be selected using an integer index.

Unable to process template language expressions for action 'Apply_to_each' at line '0' and column '0': 'The template language expression 'array(outputs('List_rows_present_in_a_table')?['body/value']?['IT Project Manager'])' cannot be evaluated because property 'IT Project Manager' cannot be selected. Array elements can only be selected using an integer index. Please see https://aka.ms/logicexpressions for usage details.'.

I get this error message. I have initialized a string array which i want to fill with a column of an excel table.
The following is the step/action where the error occurs. All i want is to get through all rows of the column "IT Project Manager" = names, and get them into my String array in a redundant way so that every name is only one time given in the array.


So basically i am asking you how to export a column of an excel table into an string array?


2023-05-31 13_04_07-Edit your flow _ Power Automate und 4 weitere Seiten - Geschäftlich – Microsoft​.png

1 ACCEPTED SOLUTION

Accepted Solutions
rzaneti
Super User
Super User

Hi @fokumus007 ,

 

The error is happening because you are trying to use an "apply to each" loop to a string, when the action requires an array as input.

 

Based on your description and on the images that you shared, I see that your first loop is fine, as you are basically iterating the "rows from an Excel table". For the second loop, however, it looks like you are trying to iterate some field from one of those Excel rows, which usually is a string. 

 

As the "apply for each" loop will return you each row from the table, you will be able to access each column value from the dynamic content (or via expressions, if you prefer). 

 

For example, take this Excel table: I will try to access all values form column "A" in Power Automate:

rzaneti_0-1685531219706.png

 

After run the "List rows present in a table", you can click in "Click to download" in the outputs section of the action to see how Power Automate is reading the data from your table

rzaneti_1-1685531298602.png

 

This is my output, and you can see that each row is stored inside "value" as an individual object. So we can assume that the "value" property (that one that you iterated in your flow) is an array of objects. 

rzaneti_2-1685531354708.png

 

When you use your the "value" from "List rows present in a table" as input for the "apply to each" action, you will be able to access the individual properties of each row inside the loop (dynamically or via expressions). In my case, I just set the "A" property (which will return the value from column "A" for the currently iterated row) to a variable.

rzaneti_3-1685531613718.pngrzaneti_4-1685531634529.png

 

Finally, in my flow run, you will see a total of 5 iterations in my loop (which is expect, as I have 5 rows in the Excel table), and each one will be accessing the value from "A" column for the respective row (in the case below, the captured value was 7, which can be found in the 3rd row):

rzaneti_5-1685531710369.png

 

Let me know if it works for you or if you need any additional help. If for any reason you need to "iterate a string value", let me know and I show you how to split it to transform it into an array and allow the looping.

View solution in original post

2 REPLIES 2
rzaneti
Super User
Super User

Hi @fokumus007 ,

 

The error is happening because you are trying to use an "apply to each" loop to a string, when the action requires an array as input.

 

Based on your description and on the images that you shared, I see that your first loop is fine, as you are basically iterating the "rows from an Excel table". For the second loop, however, it looks like you are trying to iterate some field from one of those Excel rows, which usually is a string. 

 

As the "apply for each" loop will return you each row from the table, you will be able to access each column value from the dynamic content (or via expressions, if you prefer). 

 

For example, take this Excel table: I will try to access all values form column "A" in Power Automate:

rzaneti_0-1685531219706.png

 

After run the "List rows present in a table", you can click in "Click to download" in the outputs section of the action to see how Power Automate is reading the data from your table

rzaneti_1-1685531298602.png

 

This is my output, and you can see that each row is stored inside "value" as an individual object. So we can assume that the "value" property (that one that you iterated in your flow) is an array of objects. 

rzaneti_2-1685531354708.png

 

When you use your the "value" from "List rows present in a table" as input for the "apply to each" action, you will be able to access the individual properties of each row inside the loop (dynamically or via expressions). In my case, I just set the "A" property (which will return the value from column "A" for the currently iterated row) to a variable.

rzaneti_3-1685531613718.pngrzaneti_4-1685531634529.png

 

Finally, in my flow run, you will see a total of 5 iterations in my loop (which is expect, as I have 5 rows in the Excel table), and each one will be accessing the value from "A" column for the respective row (in the case below, the captured value was 7, which can be found in the 3rd row):

rzaneti_5-1685531710369.png

 

Let me know if it works for you or if you need any additional help. If for any reason you need to "iterate a string value", let me know and I show you how to split it to transform it into an array and allow the looping.

fokumus007
Frequent Visitor

Great explanation, thanks a lot!

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