Computed data: Cannot read property 'filter' of undefined

[paulrobertlloyd]

Describe the bug
This is in relation to the change in #973, which now has my computed data throwing an error. This might by okay – maybe what I’m trying to achieve isn’t possible – but thought it was worth flagging all the same.

I have the following computed data in a directory data file, that I use to find article posts related to a given project (which I do using a category frontmatter key; if an article has a category value that is the same as a projects title, it’s deemed to be related):

module.exports = {
  layout: 'project',
  permalink: 'projects/{{ page.fileSlug }}/',
  eleventyComputed: {
    related: data => {
      const articles = data.collections.article;
      return articles.filter(article => {
        const {category} = article.data;
        if (!category) {
          return false;
        }

        return category.includes(data.title);
      });
    }
  }
};

However, I now get the following error:

Problem writing Eleventy templates: (more in DEBUG output)
> Cannot read property 'filter' of undefined

Is 11ty no longer aware of the global data object at this point in the cascade? I was getting this error intermittently before, so I guess having it be persistent is an improvement, of sorts 😉

Additional context

• Eleventy version: master@9109e7

[zachleat]

Can you retest with the new version on GitHub? I think I boggled how computed data treats arrays last weekend, hoping it’s patched now. If not I’ll dive in deeper here before 0.11 ships

[paulrobertlloyd]

Yep, this appears fixed. Thanks @zachleat!