Jekyll `where_exp` filter with "contains" expression

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I'm creating a page for authors for my Jekyll website. On this page, I want to show all the posts that this particular author has written.

This is how my posts look like:

title: "Some title"
authors: [author1, author2]

For keeping the list of authors, I use collections.

An author looks like that:

short: author1
name: "Author 1 Full Name"

Now for author1 I want to find all the articles of this author. I'm trying to use where_exp for that:

{% assign articles = site.posts | where_exp: "authors", "authors contains page.short" %}

In this case, page.short contains author1.

But the list articles is empty. Do you know what could be the problem?

jekyll liquid
1 Answers

You have a syntax issue in your filter, you can refer to the way it is used in the documentation.

You can see there that it is used as

{{ site.members | where_exp:"item", "item.projects contains 'foo'" }}

But in your attempt, you are missing to define what field of the item should the contains query.

In the code

where_exp:"item", "item.projects contains 'foo'"

we do define an item out of an array, and then we expect this item to have a field projects; where we want only the one containing the project foo

When in your code

where_exp: "authors", "authors contains page.short"

You are saying that the item is actually called authors and you want the item itself to contain page.short

A more correct approach would be:

site.posts | where_exp: "post", "post.authors contains page.short"

Because the items of your array site.posts are actually posts, so an item of it is a post.
Then, on a post, you expect a field authors, so post.authors to contain a specific string.

user_21235300
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