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?

[Anonymous · 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

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