class-gravityview-field-post-id.php

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<?php
/**
 * @file class-gravityview-field-post-id.php
 * @package GravityView
 * @subpackage includes\fields
 * @since 1.7
 */

/**
 * Add custom options for Post ID fields
 *
 * @since 1.7
 */
class GravityView_Field_Post_ID extends GravityView_Field {

    var $name = 'post_id';

    var $is_searchable = true;

    var $search_operators = array( 'is', 'isnot', 'greater_than', 'less_than' );

    var $group = 'post';

    /**
     * GravityView_Field_Post_ID constructor.
     */
    public function __construct() {
        $this->label = esc_html__( 'Post ID', 'gk-gravityview' );
        parent::__construct();
    }

    public function field_options( $field_options, $template_id, $field_id, $context, $input_type, $form_id ) {

        $this->add_field_support('link_to_post', $field_options );

        return $field_options;
    }

}

new GravityView_Field_Post_ID;