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jereaallikko's avatar
jereaallikko
Helper III
5 years ago
Solved

Help with expanding json columns

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

 

Need Help
Tips and Tricks
  • ImkeF's avatar
    ImkeF
    5 years ago

    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"

     

1 Reply

  • ImkeF's avatar
    ImkeF
    Community Champion
    5 years ago

    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"