post_excerpt.php

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<?php
/**
 * Display the post_content field type
 *
 * @package GravityView
 * @subpackage GravityView/templates/fields
 */

$gravityview_view = GravityView_View::getInstance();

extract( $gravityview_view->getCurrentField() );

if( !empty( $field_settings['dynamic_data'] ) && !empty( $entry['post_id'] ) ) {

    global $post;

    /** Backup! */
    $_the_post = $post;

    $post = get_post( $entry['post_id'] );

    if( empty( $post ) ) {
        do_action('gravityview_log_debug', 'Dynamic data for post #'.$entry['post_id'].' doesnt exist.' );
        wp_reset_postdata();
        return;
    }

    setup_postdata( $post );
    the_excerpt();
    wp_reset_postdata();

    /** Restore! */
    $post = $_the_post;

} else {
    echo $display_value;
}