Fix transform function logic for deeply nested jsonb

[Eprince-hub]

The createJsonTransform() function is not transforming deeply nested objects and arrays in jsonb

function createJsonTransform(fn) {
  return function jsonTransform(x, column) {
    return typeof x === 'object' && x !== null && (column.type === 114 || column.type === 3802)
      ? Array.isArray(x)
        ? x.map(x => jsonTransform(x, column))
        : Object.entries(x).reduce((acc, [k, v]) => Object.assign(acc, { [fn(k)]: v }), {})
      : x
  }
}

Problem

It wasn't transforming deeply nested arrays and objects because the reduce() method only iterate over the keys and values of the top-level object. It does not recursively transform the keys of any subsequent nested objects.

Solution

jsonTransform() function needs to be called on the values of each key-value pair in the object so that it can keep iterating and transforming them regardless of how deeply nested they are.
Example:

function createJsonTransform(fn) {
  return function jsonTransform(x, column) {
    return typeof x === 'object' && x !== null && (column.type === 114 || column.type === 3802)
      ? Array.isArray(x)
        // Recursively transform array elements
        ? x.map(x => jsonTransform(x, column))
        // Recursively transform object keys and values
        : Object.entries(x).reduce((acc, [k, v]) => {
          // Use fn() to transform the key
          const transformedKey = fn(k);
          return Object.assign(acc, { [transformedKey]: jsonTransform(v, column) });
        }, {})
      // Return non-object values as-is
      : x;
  };
}