creating an index with json

layout_searchindex.njk

{{ collections.allSearch | searchSingle(folder) | dump | safe }}

searchfilter.js

const elasticlunr = require("elasticlunr");


module.exports = function (folder) {
  // folder gets out undefined
  console.log(folder);
  // what fields we'd like our index to consist of
  var index = elasticlunr(function () {
    this.addField("title");
    this.addField("tags");
    this.addField("chapnum");
    this.addField("content");
    this.setRef("id");
  });

  // loop through each page and add it to the index
  collection.forEach((item) => {
    console.log(`folder`, folder);
    console.log(`item.data.folder`, item.data.folder)
    if(item.data.folder == folder) {
    index.addDoc({
      id: item.url,
      content: item.templateContent,
      chapnum: item.data.order,
      title: item.data.title,
      tags: item.data.tags
      
    });
  }
  });

  return index.toJSON();
};

subfolder_searchindex.njk

---
folder: modernworldhistory
permalink: "/books/{{folder}}/content.json"
title: "search in the book"
menu: false
layout: searchindex.njk
---