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Is there a way to only fetch categories that have been assigned to a minimum of entries, i.e. 4?

Currently I fetch categories like this:

{% set productIds = craft.entries.section('products').ids() %}
{% set categories = craft.categories.relatedTo({ sourceElement: productIds }) %}

I know I can now do the following to only display content for categories which have been assigned to at least four entries:

{% set entries = craft.entries.section('products').relatedTo(category) %}
{% if entries|length > 4 %}
  ...
{% endif %}

But is there a way to apply this logic to the craft.categories query?

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What you can always do in situations, where the default parameters are not enough, is to "collect" element IDs and pass them to the id param of a new criteria model.

So loop through all categories and merge the category IDs matching you condition to an array:

{% set topCategoriesIds = mainCategoriesIds|merge([category.id]) %}

When you're done, get your filtered categories from these IDs:

{% set categories = craft.categories.id(topCategoriesIds) %}
  • Thank you Carl. I don't fully follow. How does that give me categories that are related to equal or more than 4 entries? If I understand correctly, this still creates an extra loop and query, so performance wise there is no gain to my original way, is there? – Katrin Aug 25 '15 at 7:54
  • No, it is really the same to your idea, so no performance gains at all. The only difference is, that you can now query for them with a single criteria model. I thought that's what you needed, as this allows you to paginate the results or do other things not possible when having the conditional in your "output loop". – carlcs Aug 25 '15 at 8:00
  • That makes sense and am sure would come in very handy in other scenarios. For my current situation, I was looking to see if there was a way to adapt the craft.categories query so that I didn't have to create an additional entries query and loop. – Katrin Aug 25 '15 at 8:14
  • No, unfortunatelly there's no way to add your custom conditional to the relatedTo param in your query. What about wrapping the output loop in cache tags? How is your PHP/MySQL knowledge, you could write a custom plugin to get them with a single query from the database? – carlcs Aug 25 '15 at 8:21
  • Yes, definitely a good call on the caching. My PHP knowledge is limited. I could maybe dabble something together, but it isn't absolutely necessary right now and am happy to use what I've got. Thanks for your ideas :) – Katrin Aug 25 '15 at 10:31
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Short answer: There is no way to apply this sort of logic to the craft.categories query. The way I have set this up is good. It can be improved performance wise by wrapping the queries around a {% cache %} tag.

As Carl has pointed out in his answer, the matching categories could also be merged into an array and added to a new query, which could then be used for pagination etc.

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