Custom Fields Missing for (items,item_prices,item_families,coupons) ever since recent refactoring

[rickpaulfmg]

It looks like the recent refactoring requires custom fields to be handled per object.

The following code was added to "subscriptions.py" as well as "customers.py". It was overlooked on "items.py, item_prices.py, item_families.py, coupons.py, invoices.py, credit_notes.py". Can we add this code block to each object script:

  def add_custom_fields(self, record: dict):
       """
       Adds custom fields to the record.
       """
       custom_fields = {}
       for key in record.keys():
           if "cf_" in key:
               custom_fields[key] = record[key]

       if custom_fields:
           record["custom_fields"] = json.dumps(custom_fields)

       return record