patch method
Updates an existing inventory source.
Returns the updated inventory source if successful.
request - The metadata request object.
Request parameters:
inventorySourceId - Output only. The unique ID of the inventory source.
Assigned by the system.
Value must have pattern ^\[^/\]+$.
advertiserId - The ID of the advertiser that the request is being made
within.
partnerId - The ID of the partner that the request is being made within.
updateMask - Required. The mask to control which fields to update.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a InventorySource.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<InventorySource> patch(
  InventorySource request,
  core.String inventorySourceId, {
  core.String? advertiserId,
  core.String? partnerId,
  core.String? updateMask,
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if (advertiserId != null) 'advertiserId': [advertiserId],
    if (partnerId != null) 'partnerId': [partnerId],
    if (updateMask != null) 'updateMask': [updateMask],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v4/inventorySources/' + core.Uri.encodeFull('$inventorySourceId');
  final response_ = await _requester.request(
    url_,
    'PATCH',
    body: body_,
    queryParams: queryParams_,
  );
  return InventorySource.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}