Merging two Arrays of objects

[Martin_S]

Hi

I am trying to merge two arrays of objects to one array.
The two arrays have one property in common that should be used to correlate the data correctly.
The arrays are not sorted in order and have different number of objects.

How do I combine the two arrays into to a single array with three properties using the ID property to correlate them correctly?

Br Martin Strandholm

Array 1:

[
{
"ID": "3333",
"Object_Name": "Power"
},
{
"ID": "1111",
"Object_Name": "Automate"
},
{
"ID": "2222",
"Object_Name": "Function"
}
]

Array 2:

[
{
"ID": "1111",
"Size": "5"
},
{
"ID": "2222",
"Size": "6"
},
{
"ID": "3333",
"Size": "8"
},

{
"ID": "4444",
"Size": "8"
}
]

[ManishJain]

Hi @Martin_S ,

Here is a nice article written for the same :

https://sharepains.com/2020/03/20/create-joins-in-power-automate/

Thanks

[Paulie78 · Accepted solution]

Hi @Martin_S,

It is an interesting question and something that comes up quite often. I've done a video for you which demonstrates a very efficient way of performing what you want to do.

https://youtu.be/QSF6dNkSKSA

Hope it helps.

Blog: tachytelic.net

YouTube: https://www.youtube.com/c/PaulieM/videos

If I answered your question, please accept it as a solution 😘

[Martin_S]

Thank you Paulie78.

I was trying with different ways of getting this done with good performance since the input will be a sharepoint list with a few thousand objects being combined with input from excel with about 600 objects.
When I tried doing it with Apply to each inside Apply to each it takes forever.

The way you did it was very clever and I will try to get it working.

Br Martin Strandholm

[Martin_S]

Hello

It is working nicely, except when one of the arrays is missing the id value.
Is there a way for the merge compose action to accept a null value in ID and continue?
Just adding the property accepting that the item()['ID'] is null?

addProperty(item(), 'Size', xpath(outputs('XML'), concat('//Array[ID/text()="', item()['ID'], '"]/Size/text()'))[0]) 

[Paulie78]

Change the expression to:

addProperty(item(), 'Size', xpath(outputs('XML'), concat('//Array[ID/text()="', item()?['ID'], '"]/Size/text()'))?[0])