Route model binding

Route::get('/topics/{topic}', ShowTopic::class);                              // routeKey() column
Route::get('/posts/{post:seo_slug}', ShowPost::class);                        // any slug column
Route::get('/clinics/{clinic}/products/{product:slug}', ShowProduct::class)->scopeBindings();
Route::get('/archive/{topic}', ShowArchived::class)->withTrashed();
route('topics.show', $topic);                                                 // current-locale slug

• routeKey() makes the column getRouteKeyName(); for a locale map getRouteKey() is the current-locale slug, so URL generation depends on the locale — queued URL generation should run under the intended locale.
• Binding follows the definition’s chain (LocaleFallback::Any by default, so a URL in any resolvable locale still resolves) and prefers the current locale.
• Scoped child bindings (->scopeBindings(), HasMany and BelongsToMany) and ->withTrashed() routes are covered.
• Non-string, over-long or control-character values never reach the database.

Primary-key fallback

SlugDefinition::for('slug')->from('name')->routeKey()->bindByKeyFallback();
// /products/red-chair and /products/42 both resolve

bindByKeyFallback() (or binding.key_fallback globally) tries the primary key after a slug miss — and only for values shaped like the key: ctype_digit for integer keys, the model’s own uuid/ulid validation for unique ids. A numeric slug like 2024 is never shadowed by id 2024.

Composing with HasUuids / HasUlids

HasUuids and HasUlids also define resolveRouteBindingQuery, so resolve the conflict with insteadof — HasSlug keeps their malformed-id guard for key bindings:

use HasSlug, HasUuids {
    HasSlug::resolveRouteBindingQuery insteadof HasUuids;
}

A method declared on the model class itself silently wins over the trait — delete your own getRouteKeyName() / resolveRouteBinding() when adopting routeKey().