When I flip the "Featured Entry" switch, disable it on other entries Assuming I'm using a lightswitch to denote an entry as "Featured," how can I then disable that lightswitch on every other entry, so that no matter how many times I flip these switches only one entry can be "Featured?"

Thanks!



Edit: There are some plugin options, and that might be the only way to go but I'm hoping that someone can find a better way through Twig filters or something.
It depends on your sort order. If your goal is to only display the most recent 'featured' entry, then you could add the .first parameter to your template code. 

Craft would simply grab the first entry it finds

OR, you could limit your query by using the Limit parameter. See: https://craftcms.com/docs/templating/craft.entries#limit



Edit (addition):
Here's an example of how you could display the single, most recent entry which has been marked as Featured, using a lightswitch field.

{% set featuredNews = craft.entries.section('news').featured('not 0').order('dateUpdated desc').limit(1) %}
{% for entry in featuredNews %}
    {{ entry.title }}
{% endfor %}


(Some valuable insight here: craft.entries and lightswitch and here: https://craftcms.com/docs/lightswitch-fields)

Hope it helps