GravityView - Sort by a Custom Content field value, using the value from another field

gravityview-custom-sort-field.php

<?php

/* 
 * Tell GravityView to allow sorting on Field #1, for Form #4.
 * For example, a Custom Content field that contains another field's value.
 */
add_filter( 'gravityview/sortable/formfield_4_1', '__return_true' );

add_filter( 'gravityview_get_entries', 'gv_custom_sort_by_custom_content_field', 10, 3 );

/**
 * Modify the "get entries" criteria to override sorting
 *
 * @param array $parameters Array with `search_criteria`, `sorting` and `paging` keys.
 * @param array $args View configuration args. {
 *      @type int $id View id
 *      @type int $page_size Number of entries to show per page
 *      @type string $sort_field Form field id to sort
 *      @type string $sort_direction Sorting direction ('ASC' or 'DESC')
 *      @type string $start_date - Ymd
 *      @type string $end_date - Ymd
 *      @type string $class - assign a html class to the view
 *      @type string $offset (optional) - This is the start point in the current data set (0 index based).
 * }
 * @param int $form_id ID of Gravity Forms form
 */
function gv_custom_sort_by_custom_content_field( $parameters = array(), $args = array(), $form_id = 0 ) {

	//
	// SET THIS TO THE ID OF THE CUSTOM CONTENT FIELD YOU WANT TO SORT
	//
	$custom_content_field_id = 1;
	
	// Update the "4" number below to match the form ID!!!!
	if( 4 !== (int) $form_id ) {
		return $parameters;
	}
	
	// Return: GravityView is not trying to sort by the Custom Content field
	if( empty( $parameters['sorting']['key'] ) || $custom_content_field_id !== (int) $parameters['sorting']['key'] ) {
		return $parameters;
	}

	$sort_field_id = 5; // Set the field ID you want to sort by, when sorting the Custom Content field

	$sort_direction = isset( $_GET['dir'] ) ? $_GET['dir'] : rgar( $args, 'sort_direction' );

	$sorting = array(
		'key' => $sort_field_id,
		'direction' => strtolower( $sort_direction ),
		'is_numeric' => GVCommon::is_field_numeric( $form_id, $sort_field_id ),
	);

	$parameters['sorting'] = $sorting;

	GravityView_View::getInstance()->setSorting( $sorting );
	
	return $parameters;
}

hi
how i can sort table view by {date_updated} merge tag in custom content field?

@al01101001 Set the $sort_field_id to 'date_updated', should work!

@al01101001 Set the $sort_field_id to 'date_updated', should work!

thank you for you'r response !
and for $custom_content_field_id what should I used?
seems custom content filed don't have any id! or at least I don't see it.
thanks again for you'r help

looks like this filter is now outdated?