How to remove DataValidationRule via Google Sheets API - php

Question

Currently I'm using the Google Sheets API via their PHP library to build a dynamic spreadsheet. I've set validation rules on a spreadsheet, specifically to create a dropdown list of states to select.
I have since updated the spreadsheet to have the state dropdown list in a different column. Upon doing this however, it seems the DataValidationRule that was set for the previous column, is still there.
I've attempted to create a method to REMOVE all validation from my sheet before re-applying any validation I want, but it does not seem to be working.
https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets/other#conditiontype
When setting a Condition Type, I'd like to revert the validation back to CONDITION_TYPE_UNSPECIFIED, however the API simply returns an error if I do so. I've attempted to use others such as ONE_OF_LIST, but then every cell errors saying:
Invalid: Input must be an item on specified list
Which makes sense, considering there is no list being generated (nor do I want one).
The rest of the columns can be any sort of combination of numbers/dates/text so I'd like to simply remove all validation before applying validation again.
Here's my current clearValidation code:
public function clearSpreadsheetValidations($spreadsheetId) {
$client = $this->getClient();
$service = new Google_Service_Sheets($client);
$conditions = new Google_Service_Sheets_BooleanCondition();
$conditions->setType('CONDITION_TYPE_UNSPECIFIED');
$conditions->setValues(null);
$setRule= new Google_Service_Sheets_DataValidationRule();
$setRule->setCondition($conditions);
$setRule->setInputMessage(null);
$setRule->setShowCustomUi(false);
$valReq = new Google_Service_Sheets_SetDataValidationRequest();
$valReq->setRule($setRule);
$sheetReq = new Google_Service_Sheets_Request();
$sheetReq->setSetDataValidation($valReq);
$requestBody = new Google_Service_Sheets_BatchUpdateSpreadsheetRequest();
$requestBody->setRequests($sheetReq);
$service->spreadsheets->batchUpdate($spreadsheetId, $requestBody);
}
How can I call the sheets API to remove all previously set DataValidationRules in a spreadsheet?
Thanks!

Answer 1

Okay, as noted here
https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets/request
SetDataValidationRequest
Sets a data validation rule to every cell in the range. To clear
validation in a range, call this with no rule specified.
So all I had to do, was simply not declare a range, or set a rule, and ran this method on the existing spreadsheet to clear all existing validations
public function clearSpreadsheetValidations($spreadsheetId) {
$client = $this->getSheetsClient();
$service = new Google_Service_Sheets($client);
$valReq = new Google_Service_Sheets_SetDataValidationRequest();
$sheetReq = new Google_Service_Sheets_Request();
$sheetReq->setSetDataValidation($valReq);
$requestBody = new Google_Service_Sheets_BatchUpdateSpreadsheetRequest();
$requestBody->setRequests($sheetReq);
$service->spreadsheets->batchUpdate($spreadsheetId, $requestBody);
}

Answer 2

For java this code worked in my case.
public BatchUpdateSpreadsheetResponse removeAllDataValidation(String spreadsheetId, Sheets service)
throws IOException {
// [START sheets_conditional_formatting]
List<Request> requests = Arrays.asList(new Request().setSetDataValidation(
new SetDataValidationRequest()));
BatchUpdateSpreadsheetRequest body = new BatchUpdateSpreadsheetRequest().setRequests(requests);
BatchUpdateSpreadsheetResponse result = service.spreadsheets().batchUpdate(spreadsheetId, body).execute();
System.out.printf("%d cells updated.", result.getReplies().size());
// [END sheets_conditional_formatting]
return result;
}