How to change the name of a key in a JSON object stored in Postgres for all records

Question

In a table called priceTables I am storing in a column named value a JSON object that looks something similar to this:

{
  "price": {
    "values": {
       "tax": 1.59
     }
  }
}

And would like to run a query to migrate tens of thousands of records to change the name of values to breakdown . So it will result in

{
  "price": {
    "breakdown": {
      "tax": 1.59
    }
  }
}

Any suggestions on the Postgres query for achieving this?

Answer 1

If the name can only occur once in the JSON or if all occurrences should be replaced if there are more, a quick and dirty one is a simple replace() in the text:

UPDATE elbat
       SET value = replace(value::text, '"values"', '"breakdown"')::jsonb;

(Replace jsonb with json if the type of the column is json rather than jsonb .)

Answer 2

This should work.

UPDATE priceTables
SET value = value || jsonb_build_object(
  'price',
  jsonb_build_object(
    'breakdown',
    priceTables.value #> '{price,values}'
  )
)
WHERE priceTables.value #> '{price,values}' IS NOT NULL;