Gists

<?php

// Set the facet's Data source to "Post Type" as a placeholder

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'is_beer_on_tap' == $params['facet_name'] ) {
        if ( is_beer_available( $params['post_id'] ) ) {
            $params['facet_value'] = 'on-tap';
            $params['facet_display_value'] = 'On tap';
        }
        return false; // don't index anything else
    }
    return $params;
}, 10, 2 );

<?php

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( is_string( $params['facet_value'] ) ) {
        $params['facet_value'] = str_replace( ',', '-', $params['facet_value'] );
    }
    return $params;
}, 10, 2 );

<?php
/** for when some entries are using & and some just & to standardize to keep 
 ** facet from ending up with 2 facet_values that cause the same label to display in 2 choices
 ** generally happens with custom fields not taxonomies
 ** could be used for other encoded characters
 **/
add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( strpos( $params['facet_display_value'], '&' ) > 0 ) {
        $params['facet_display_value'] = str_replace( '&', '&', $params['facet_display_value'] ); // make & standard
        $params['facet_value'] = str_replace( '&', '', $params['facet_display_value'] ); // remove & to prevent md5 hash
    }
    return $params;
}, 10, 2 );

<?php
/** fixes values based on term slugs to be numberic by looking up term name **/
add_filter( 'facetwp_index_row', function( $params, $class ) {
    $term_id = (int) $params['term_id'];
    $value = $params['facet_value'];

    if ( 0 < $term_id && in_array( $class->facet['type'], [ 'number_range', 'slider' ] ) && !is_numeric( $value ) ) {
        // lookup term name
        $term = get_term( $term_id );
        if ( !empty( $term ) ) {
            $params['facet_value'] = $term->name;
        }
    }

    return $params;
}, 11, 2 );

<?php

/**
 * Usage:
 *
 * 1. Add the following to your (child) theme's functions.php
 * 2. Create a new facet named "post_id"
 * 3. Set its data source to "Post Type" (this serves as a placeholder)
 * 4. Save and re-index
 */
add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'post_id' == $params['facet_name'] ) {
        $params['facet_value'] = $params['post_id'];
        $params['facet_display_value'] = $params['post_id'];
    }
    return $params;
}, 10, 2 );

<?php

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'pais' == $params['facet_name'] ) {
        require_once PODS_DIR . 'classes/fields/pick.php';
        $pick = new PodsField_Pick();
        $countries = $pick->data_countries();
        $label = $params['facet_display_value'];
        if ( isset( $countries[ $label ] ) ) {
            $params['facet_display_value'] = $countries[ $label ];
        }
    }
    return $params;
}, 10, 2 );

<?php

// Add to your (child) theme's functions.php, and re-index afterwards

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'project_programs' == $params['facet_name'] ) {
        $val = $params['facet_value'];
        $val = preg_replace( '/^[a-z0-9]/', '-', $val );
        $val = preg_replace( '/[\-]+/', '-', $val );
        $params['facet_value'] = $val;
    }
    return $params;
}, 10, 2 );

<?php

add_filter('facetwp_index_row', function( $params ) {
    $params['facet_display_value'] = wp_encode_emoji( $params['facet_display_value'] );
    return $params;
});

<?php

/**
 * 1. Add to your (child) theme's functions.php
 * 2. Assumes a facet named "doctor_location" w/ an ACF relationship field data source
 * 3. Assumes that the ACF Map field name is "location"
 */
add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'doctor_location' == $params['facet_name'] ) {
        $location_id = (int) $params['facet_value'];
        $location = get_field( 'location', $location_id );
        $params['facet_value'] = empty( $location ) ? '' : $location['lat'];
        $params['facet_display_value'] = empty( $location ) ? '' : $location['lng'];
    }
    return $params;
}, 10, 2 );

<?php

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'stock' == $params['facet_name'] && 1 == $params['facet_value'] ) {
        $post_id = (int) $params['post_id'];
        $product = wc_get_product( $post_id );
        if ( 'instock' !== $product->get_stock_status() ) {
            $params['facet_value'] = 0;
            $params['facet_display_value'] = 'Out of Stock';
        }
    }
    return $params;
}, 10, 2 );