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url: /reference/models/external-link.md
---
# ExternalLink

Links pointing outside your application, usable in [menus](/reference/models/menu-node) and content.

## Columns

| Column | Type | Notes |
| --- | --- | --- |
| `key` | string | unique, optional |
| `url` | string | required |

## Behavior

* `has_many :menu_nodes, as: :linkable, dependent: :destroy`
* `key` uniqueness (allow nil), `url` presence
* `to_s` returns the URL