class-gravityview-field-post-custom-field.php

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

class GravityView_Field_Post_Custom_Field extends GravityView_Field {

    var $name = 'post_custom_field';

    var $is_searchable = true;

    /**
     * @var array $search_operators Custom fields are text, but can be any format (including JSON)
     */
    var $search_operators = array( 'contains', 'is', 'isnot' );

    /**
     * @see GF_Field_Post_Custom_Field
     */
    var $_gf_field_class_name = 'GF_Field_Post_Custom_Field';

    var $group = 'post';

    var $icon = 'dashicons-admin-generic';

    public function __construct() {
        $this->label = esc_html__( 'Post Custom Field', 'gk-gravityview' );
        parent::__construct();

        $this->add_hooks();
    }

    /**
     * Add hooks for the field
     *
     * @since 1.17
     *
     * @return void
     */
    private function add_hooks() {
        add_filter( 'gravityview/edit_entry/field_value_post_custom_field', array( $this, 'edit_entry_field_value'), 10, 2 );
    }

    /**
     * Fix "List" Field Type pre-population of content in Edit Entry mode
     *
     * @since 1.17
     *
     * @param mixed $field_value field value used to populate the input
     * @param GF_Field $field Gravity Forms field object
     *
     * @return mixed If a List input for Custom Field, returns JSON-decoded value. Otherwise, original value.
     */
    public function edit_entry_field_value( $field_value, $field ) {

        if( 'list' === $field->inputType ) {
            $field_value = is_string( $field_value ) ? json_decode( $field_value, true ) : $field_value;

            if ( ! is_array( $field_value ) ) {
                gravityview()->log->error( '"List" Custom Field value not an array or string.', array( 'data' => compact( 'field_value', 'field' ) ) );
            }
        }

        return $field_value;
    }

}

new GravityView_Field_Post_Custom_Field;