Help with expanding json columns

[jereaallikko]

Hi all,

I need help with modifying columns that contains List->Record.

I am having a table of two columns : Id and Column1 and 82 rows. As shown below, Column1 contains List which needs to be expanded. 

After expanding it to new rows, it creates a records and adds 38 rows = 180rows. Under the record, there are 2 columns, ID and Label. The problem is, that Power Query is duplicating the IDs that contains more than 1 Label.

What I am trying to do, is to form the columns in a way, that there are no duplicate IDs, (caused by more than 1 Label). Instead, how can I form it in a way, that if a ID contains more than 1 Label, the labels are in the same row.

For example;

ID567205 contains 2 Labels; 1.1.20A_L3INT_NUM & 1.1.20A_W_0.1MP_NUM

and the query looks like this

ID		Column1.label
ID567205		1.1.20A_L3INT_NUM
ID567205		1.1.20A_W_0.1MP_NUM

But I would like it to look like this

ID		Column1.label
ID567205		1.1.20A_L3INT_NUM, 1.1.20A_W_0.1MP_NUM

PS, if I try to expand the List with Extract values with comma, it shows Error and tells;

Expression.Error: We cannot convert a value of type Record to type Text.

I have tried to change the data type to any/text/whole number etc. but nothing seems to work. 

Feel free to ask more information if my explination was not clear enough.

Best regards,

Jere

[ImkeF · Accepted solution]

Hi @jereaallikko ,

if my understanding is correct you have to tweak the expansion code a bit like so:

let
  Source = #table(
      {"ID", "Column1"}, 
      {{"ID1", {[id = 12500, label = "58T"], [id = 13500, label = "13A"]}}}
    ),
  #"Extracted Values" = Table.TransformColumns(
      Source, 
      {
        "Column1", 
        each Text.Combine(
            List.Transform(_, (x) => Text.Combine({Text.From(x[id]), Text.From(x[label])}, ", ")), 
            ", #(lf)"
          ), 
        type text
      }
    )
in
  #"Extracted Values"