Hoe to get a value from JSON

[Syndicate_Admin]

Hi,

I need help in accessing a value in a JSON string.

I have a column called "ratings_and_unit_endorsements" which has the JASON strings. Here is an example:

[{"expiry_date":"2023-11-29","rating":"ADI","unit":"EXYY"},{"expiry_date":"2023-11-30","rating":"APS","unit":"OMXX"},{"expiry_date":"2023-12-01","rating":"APS","unit":"LTOO"}]

I have another column "unit" which has values corresponding to the unit values in the JSON. 

How can I create a column with only the expiry_date from the JSON that matches the value in column "unit"? So if the column "unit" has a value "LTOO", the new column would have "2023-12-01".

When I use Parse JSON, the new column has lists on each row and those lists contain the records.

Here is the Parse JSON:

Table.AddColumn(#"Replaced value", "JSON", each Json.Document([ratings_and_unit_endorsements]), type any)

[Syndicate_Admin]

I had to change it slightly so it takes into account both "unit" and "rating" and now it works.

Table.AddColumn(#"Renamed columns", "Expiry Date", each List.Select(Json.Document([ratings_and_unit_endorsements]),(record) => record[unit] = [unit] and record[rating] = [rating]){0}[expiry_date])

Thank you!

[Syndicate_Admin]

I'm able to get the desired result with the following:

Table.AddColumn(#"Inserted JSON", "expiry_date", each try
if 
   Record.Field([JSON]{0}, "unit") = [unit] and 
   Record.Field([JSON]{0}, "rating") = [rating] 
then Record.Field([JSON]{0}, "expiry_date") 
else if
   Record.Field([JSON]{1}, "unit") = [unit] and 
   Record.Field([JSON]{1}, "rating") = [rating] 
then Record.Field([JSON]{1}, "expiry_date")
else if
   Record.Field([JSON]{2}, "unit") = [unit] and 
   Record.Field([JSON]{2}, "rating") = [rating] 
then Record.Field([JSON]{2}, "expiry_date")
else if
   Record.Field([JSON]{3}, "unit") = [unit] and 
   Record.Field([JSON]{3}, "rating") = [rating] 
then Record.Field([JSON]{3}, "expiry_date")
else if
   Record.Field([JSON]{4}, "unit") = [unit] and 
   Record.Field([JSON]{4}, "rating") = [rating] 
then Record.Field([JSON]{4}, "expiry_date")
else false
otherwise "")

This can probably be done better without hardcoding the indexes but I don't know how. Any ideas?

[v-cgao-msft · Accepted solution]

Hi ,

Please try:

List.Select(Json.Document([ratings_and_unit_endorsements]),(record) => record[unit] = [unit]){0}[expiry_date]

All steps:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45Wiq6OUUqtKMgsqoxPSSxJjVGyilEyMjAy1jU01DWyjFHSiVEqSizJzEsHyzi6eIKFSvMyS8ACrhGRkTFKtTp4TDE2wDAlIBjVFH/fiAi8phjpGhgSNMUnxN8faEqskg6YqRQbCwA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ratings_and_unit_endorsements = _t, unit = _t]),
    AddExpiryDate = Table.AddColumn(Source, "Expiry Date", each List.Select(Json.Document([ratings_and_unit_endorsements]),(record) => record[unit] = [unit]){0}[expiry_date])in
    AddExpiryDate

Best Regards,
Gao
Community Support Team

If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly.
If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

How to get your questions answered quickly --  How to provide sample data in the Power BI Forum