BuddyPress Meta Query Woes

<?php

/**
 *
 *
 * This file defines and implements custom group fields for Great Books Great Discussions.
 *
 *
 */

function custom_field($meta_key='') {
    //get current group id and load meta_key value if passed. If not pass it blank
    return groups_get_groupmeta( bp_get_group_id(), $meta_key) ;
}

//code if using seperate files require( dirname( __FILE__ ) . '/buddypress-group-meta.php' );
// This function is our custom field's form that is called in create a group and when editing group details
function group_header_fields_markup() {
    global $bp, $wpdb;?>


    <label for="group-custom-field-address">Address</label>
    <input id="group-custom-field-address" type="text" name="group-custom-field-address" value="<?php echo custom_field('group-custom-field-address'); ?>" />

    <label for="group-custom-field-address-unit">Apt. / Unit / Suite:</label>
    <input id="group-custom-field-address-unit" type="text" name="group-custom-field-address-unit" value="<?php echo custom_field('group-custom-field-address-unit'); ?>" />

    <label for="group-custom-field-city">City</label>
    <input id="group-custom-field-city" type="text" name="group-custom-field-city" value="<?php echo custom_field('group-custom-field-city'); ?>" />

    <label for="group-custom-field-state">State</label>
    <input id="group-custom-field-state" type="text" name="group-custom-field-state" value="<?php echo custom_field('group-custom-field-state'); ?>" />

    <label for="group-custom-field-zip">Zip Code</label>
    <input id="group-custom-field-zip" type="text" name="group-custom-field-zip" value="<?php echo custom_field('group-custom-field-zip'); ?>" />

    <br>

<?php }

// This saves the custom group meta – props to Boone for the function
// Where $plain_fields = array.. you may add additional fields, eg
//  $plain_fields = array(
//      'field-one',
//      'field-two'
//  );
function group_header_fields_save( $group_id ) {

    global $bp, $wpdb;

    $plain_fields = array(

        'group-custom-field-address',
        'group-custom-field-address-unit',
        'group-custom-field-city',
        'group-custom-field-state',
        'group-custom-field-zip',

    );

    foreach( $plain_fields as $field ) {

        $key = $field;

        if ( isset( $_POST[$key] ) ) {

            $value = $_POST[$key];

            groups_update_groupmeta( $group_id, $field, $value );
        }
    }
}

add_filter( 'groups_custom_group_fields_editable', 'group_header_fields_markup' );
add_action( 'groups_group_details_edited', 'group_header_fields_save' );
add_action( 'groups_created_group',  'group_header_fields_save' );

// Show the custom field in the group header
function show_field_in_header( ) {
    echo "<p>Address:" . custom_field('group-custom-field-address') . "</p>";
    echo "<p>Apt. / Unit / Suite:" . custom_field('group-custom-field-address-unit') . "</p>";
    echo "<p>City:" . custom_field('group-custom-field-city') . "</p>";
    echo "<p>State:" . custom_field('group-custom-field-state') . "</p>";
    echo "<p>Zip code:" . custom_field('group-custom-field-zip') . "</p>";
}

add_action('bp_group_header_meta' , 'show_field_in_header') ;

function gbgd_bpgf_filter_ajax_querystring( $querystring = '', $object = '' ) {

    /* bp_ajax_querystring is also used by other components, so you need
    to check the object is groups, else simply return the querystring and stop the process */
    if( $object != 'groups' )
        return $querystring;

    // Let's rebuild the querystring as an array to ease the job
    $defaults = array(
        'type'            => 'active',
        'action'          => 'active',
        'scope'           => 'all',
        'page'            => 1,
        'user_id'         => 0,
        'search_terms'    => '',
        'exclude'         => false,
    );

    $gbgd_bpgf_querystring = wp_parse_args( $querystring, $defaults );

    /* this is your meta_query */
    $gbgd_bpgf_querystring['meta_query'] = array(
        'relation' => 'OR',
        array(
            'key'     => 'group-custom-field-zip',
            'value'   => $gbgd_bpgf_querystring["search_terms"],
            'type'    => 'numeric',
            'compare' => 'LIKE'
        )
    );

    echo '<pre>';
    var_dump($gbgd_bpgf_querystring["search_terms"]);
    echo '</pre>';

    // using a filter will help other plugins to eventually extend this feature
    return apply_filters( 'gbgd_bpgf_filter_ajax_querystring', $gbgd_bpgf_querystring, $querystring );
}

/* The groups loop uses bp_ajax_querystring( 'groups' ) to filter the groups
   depending on the selected option */
add_filter( 'bp_ajax_querystring', 'gbgd_bpgf_filter_ajax_querystring', 20, 2 );