'series' collection

[gasatrya]

I'd like to create something like this:

---
tags: eleventy
series: eleventy
---

Then display all articles under eleventy series under each article that has the same series. Is there a way to do that?

[btrem]

Maybe something like this would do the job?:

In .eleventy.js, add the following block:

eleventyConfig.addCollection('postsBySeries', function(collectionApi) {

    let series;
    let postsBySeries = {};
    let posts = collections.all;

    posts.forEach(function(post) {

        if (post.data.series) {

            series = post.data.series;

            // create a new array key with the series value if it doesn't already exist
            if (!postsBySeries[series]) {
                postsBySeries[series] = [];
            }
            // add post to the year array key
            postsBySeries[series].push(post);

        }


    });

    return postsBySeries;
});

Then, in a post, if series is defined in frontmatter, show the contents of that key from postsBySeries.