exclusive_boolean

Exclusive Boolean ensures that only one node per content type can have a specific boolean field enabled at any given time.

In many Drupal projects, editors need to mark a single piece of content as featured, highlighted, primary, or active. By default, Drupal allows multiple nodes to have the same boolean field checked, which often requires custom code or manual cleanup.

This module solves that problem automatically.

What it does
When Exclusive Boolean is enabled on a boolean field:
Editors can check the field on a node as usual

Upon saving, the module automatically unchecks the same field on all other nodes of the same content type

The most recently saved node becomes the only one with the field set to TRUE

No additional actions are required from editors.

How It Works
Adds an “Exclusive” option to boolean fields on node content types
Enforcement happens automatically during node save
Once enabled, no further configuration is required
The logic is scoped to the content type and field where it is activated

Typical use cases
Homepage featured content
One active announcement or alert
A single “current” event
One primary configuration or reference node

Key features
Works with core boolean fields
Enforced per content type
Automatic and reliable on node save
No manual cleanup required
Lightweight with minimal performance impact
No external dependencies