Hey
Yes, it’s possible. In a separate plugin you could add a new topic list that sorts topics based on the average_rating topic custom field.
Here’s an example of how to create a new topic list that is sorted by a custom field:
Well, you’ll need a sidebar first. Then a widget that has a topic list in it. Here’s some I prepared earlier:
So all you need to do is change the topic list in the layouts-topic-list widget to the topic list you created in your new plugin.
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Follow the beginners guide to creating a plugin
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Add the layouts plugin with the topic list widget
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Copy / paste the new topic list code I’ve linked above
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Change a few variable names and urls in the topic list widget and the topic list code.