How do you list all posts grouped by year?

[logicman]

I am using the Eleventy-base-blog and on the archive page it lists all the posts in chronological order.
This is the folder structure. All 2010 .md files are in the /posts/2010/ folder. And so on...

/posts/2010/
/posts/2011/
/posts/2012/
.....

The archived page works perfectly however, I want to group all 2010 posts together under the heading 2010. Then, all 2011 posts under 2011.....any idea how to achieve this or point me in the right direction?

Thanks!

[logicman]

It works and I think I got this one with some nunjucks code :)
So, in my postlist.njk I wrote this:

<ol reversed>
{% set currentYear = "" %}
{% for post in postslist | reverse %}
{% if showYear %}
      {% set postYear = post.date.getFullYear() %}
      {% if currentYear != postYear %}
      {% set currentYear = postYear %}
      <h3>{{ postYear }}</h3>
      {% endif %}
{% endif %}
  <li class=" mb-10 list-none">
    <h2><a href="{{ post.url | url }}">{% if post.data.title %}{{ post.data.title }}{% else %}<code>{{ post.url }}</code>{% endif %}</a></h2>
  </li>
{% endfor %}
</ol>

And, in the archive.njk file I have this:

<h1>Blog</h1>
{% set showYear = true %}
{% set postslist = collections.posts %}
{% include "postslist.njk" %}

The output is:

2012
Blog post 1
Blog post 2

2011
Blog post 1
Blog post 2

2010
Blog post 1
Blog post 2

This way, my index.njk which also lists the latest 10 posts won't show the date as I don't have the showYear.

Is this the best way to achieve this?

Thanks!

[davidrhoden]

I don't know if it's the best way, but it solved my issue nicely. What's the correct way to get data to a layout so I can do a "groupby" on it? #15

[darekkay]

Another variant is described in #316

I came up with my own solution:

const _ = require("lodash");

eleventyConfig.addCollection("postsByYear", (collection) => {
  return _.chain(collection.getAllSorted())
    .groupBy((post) => post.date.getFullYear())
    .toPairs()
    .reverse()
    .value();
});

{% for year, yearPosts in collections.postsByYear %}
  <h2>{{ year }}</h2>
  <ul>
    {% for post in yearPosts | reverse %}
      <li>{{ post.data.title }}</li>
    {% endfor %}
  </ul>
{% endfor %}

I have written a blog post with more explanation.

[deerawan]

Based on @darekkay but without lodash

config.addCollection("postsByYear", (collection) => {
  const posts = collection.getFilteredByTag('post').reverse();
  const years = posts.map(post => post.date.getFullYear());
  const uniqueYears = [...new Set(years)];

  const postsByYear = uniqueYears.reduce((prev, year) => {
    const filteredPosts = posts.filter(post => post.date.getFullYear() === year);

    return [
      ...prev,
      [year, filteredPosts]
    ]
  }, []);

  return postsByYear;
});

[sasrit]

Hey everyone, I am currently using @darekkay s version and it works as intended, but I started to add multilingual support now. To sort by language I filter by folder. Is there a quick way to add a filter for a folder to that? Sorry, my javascript is too bad at the moment to figure that one out by myself, as I just started learning js. I guess I could create a folder for each year and get it this way, but there has to be a more sophisticated way to do that all at once, right?

my language filter atm:
eleventyConfig.addCollection("postsDE", function(collection) { return collection.getFilteredByGlob("./src/de/blog/**/*.md").filter((item) => { return !item.data.draft && item.date <= now; }).reverse() });

[zachleat]

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[ChrisLasar]

In addition to @logicman here is my liquid based solution:

{% assign posts_by_year = collections.blog | group_by_exp: "item", "item.data.date | date: '%Y'" | reverse %}

{%- for year in posts_by_year -%}
    <h2>{{ year.name }}</h2>
    <ul>
    {%- for post in year.items reversed -%}
      <li><a href="{{ post.page.url }}">{{ post.data.title }}</a></li>
    {%- endfor -%}
    </ul>
{%- endfor -%}

As I started with 11ty and liquid today coming from hugo, please tell me if there is something wrong with this way of solving the problem.