paging more than one collection

[bsastregx]

So far I think I understand pagination.
Is it possible to add more than one collection to a pagination?
Let's say I want to include all 'posts' with tag 'technology' and 'food' at the same time:

---
eleventyNavigation:
  key: Home
  order: 1
pagination:
  data: ['collections.technology', 'collections.food']
  size: 3
  alias: posts
  reverse: true
  generatePageOnEmptyData: true
---

[pdehaan]

I don't think this is currently possible like that. Not sure if that would include everything in tagged with "technology"-OR-"food" versus "technology"-AND-"food".

Since it sounds like you want the "AND" option, I'd probably add a custom collection in your Eleventy config file like this using .getFilteredByTags():

  eleventyConfig.addCollection("foodAndTechnology", collectionApi => {
    return collectionApi.getFilteredByTags("food", "technology");
  });

---
# eleventyNavigation:
#   key: Home
#   order: 1
pagination:
  data: collections.foodAndTechnology
  size: 3
  alias: posts
  reverse: true
  generatePageOnEmptyData: true
---

{% for post in posts %}
<article>
  <h1>{{ post.data.title }}</h1>
  <p>tags={{ post.data.tags | dump | safe }}</p>
</article>
{% endfor %}

[bsastregx]

@pdehaan Thanks your your help and the quick answer.
I like the soultion that you are propossing.
However it would be nice if pagination data could accept an array.
That way the page configuration would be set only in one place (the page front matter).
By adding foodAndTechnology collection on Eleventy config, the page configuration ends up living in two places : the page frontmatter, and Eleventy config.