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✏️ Editing: NF_Upgrade.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

add_action( 'wp_ajax_ninja_forms_ajax_migrate_database', 'ninja_forms_ajax_migrate_database' );
function ninja_forms_ajax_migrate_database(){
    if( ! current_user_can( apply_filters( 'ninja_forms_admin_upgrade_migrate_database_capabilities', 'manage_options' ) ) ) return;
    $migrations = new NF_Database_Migrations();
    $migrations->nuke( true, true );
    $migrations->migrate();
    echo json_encode( array( 'migrate' => 'true' ) );
    wp_die();
}

add_action( 'wp_ajax_ninja_forms_ajax_import_form', 'ninja_forms_ajax_import_form' );
function ninja_forms_ajax_import_form(){
    if( ! current_user_can( apply_filters( 'ninja_forms_admin_upgrade_import_form_capabilities', 'manage_options' ) ) ) return;

$import = stripslashes( $_POST[ 'import' ] );

$form_id = ( isset( $_POST[ 'formID' ] ) ) ? absint( $_POST[ 'formID' ] ) : '';

delete_option( 'nf_form_' . $form_id ); // Bust the cache.

Ninja_Forms()->form()->import_form( $import, TRUE, $form_id, TRUE );

if( isset( $_POST[ 'flagged' ] ) && $_POST[ 'flagged' ] ){
        $form = Ninja_Forms()->form( $form_id )->get();
        $form->update_setting( 'lock', TRUE );
        $form->save();
    }

echo json_encode( array( 'export' => $_POST[ 'import' ], 'import' => $import ) );
    wp_die();
}

add_action( 'wp_ajax_ninja_forms_ajax_import_fields', 'ninja_forms_ajax_import_fields' );
function ninja_forms_ajax_import_fields(){
    if( ! current_user_can( apply_filters( 'ninja_forms_admin_upgrade_import_fields_capabilities', 'manage_options' ) ) ) return;
    $fields = stripslashes( $_POST[ 'fields' ] ); // TODO: How to sanitize serialized string?
    $fields = maybe_unserialize( $fields );

foreach( $fields as $field ) {
        Ninja_Forms()->form()->import_field( $field, $field[ 'id' ], TRUE );
    }

echo json_encode( array( 'export' => $_POST[ 'fields' ], 'import' => $fields ) );
    wp_die();
}

MR SKB