discourse/app/assets/javascripts/admin/addon/models/permalink.js

import { ajax } from "discourse/lib/ajax";
import discourseComputed from "discourse/lib/decorators";
import DiscourseURL from "discourse/lib/url";
import Category from "discourse/models/category";
import RestModel from "discourse/models/rest";

export default class Permalink extends RestModel {
  static findAll(filter) {
    return ajax("/admin/permalinks.json").then(function (permalinks) {
      let allLinks = permalinks.map((p) => Permalink.create(p));

      let filteredLinks = filter
        ? allLinks.filter(
            (p) => p.url.includes(filter) || p.external_url?.includes(filter)
          )
        : allLinks;

      return { allLinks, filteredLinks };
    });
  }

  @discourseComputed("category_id")
  category(category_id) {
    return Category.findById(category_id);
  }

  @discourseComputed("external_url")
  linkIsExternal(external_url) {
    return !DiscourseURL.isInternal(external_url);
  }

  @discourseComputed("url")
  key(url) {
    return url.replace("/", "_");
  }
}