presseportale/app/Models/Concerns/HasUniqueSlug.php

<?php

namespace App\Models\Concerns;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\QueryException;
use Illuminate\Support\Str;

/**
 * Generates a unique slug for an Eloquent model based on a source attribute.
 *
 * Models opt-in by overriding two methods:
 * - {@see slugScopeAttributes()} returns the attribute names whose current
 *   model values (or provided overrides) should restrict slug uniqueness.
 *   Defaults to an empty array (global uniqueness on the slug column).
 * - {@see slugFallback()} returns the fallback when the source attribute is
 *   blank (defaults to "item").
 *
 * The model is expected to expose `slug_column` (defaults to `slug`) and
 * the source attribute name to slugify (defaults to `title` or `name`).
 *
 * Typical usage:
 *
 *     $pr->slug = $pr->generateUniqueSlug($pr->title, [
 *         'portal' => $pr->portal,
 *         'language' => $pr->language,
 *     ]);
 *
 * @mixin Model
 */
trait HasUniqueSlug
{
    /**
     * Build a unique slug from `$source`. Optionally pass overrides for the
     * scoping attributes (matched against {@see slugScopeAttributes()}).
     *
     * @param  array<string, mixed>  $scope
     */
    public function generateUniqueSlug(string $source, array $scope = []): string
    {
        $base = Str::slug($source) ?: $this->slugFallback();
        $slug = $base;
        $suffix = 2;

        while ($this->slugExists($slug, $scope)) {
            $slug = $base.'-'.$suffix++;
        }

        return $slug;
    }

    /**
     * Persist the model and recover from a concurrent slug insert by
     * regenerating the next available suffix.
     *
     * @param  array<string, mixed>  $scope
     * @param  array<string, mixed>  $options
     */
    public function saveWithUniqueSlugRetry(
        string $source,
        array $scope = [],
        array $options = [],
        int $maxAttempts = 3,
    ): bool {
        for ($attempt = 1; $attempt <= $maxAttempts; $attempt++) {
            try {
                return $this->save($options);
            } catch (QueryException $exception) {
                if ($attempt === $maxAttempts || ! $this->isSlugUniqueConstraintViolation($exception)) {
                    throw $exception;
                }

                $this->setAttribute(
                    $this->slugColumn(),
                    $this->generateUniqueSlug($source, $scope),
                );
            }
        }

        return false;
    }

    /**
     * @param  array<string, mixed>  $scope
     */
    protected function slugExists(string $slug, array $scope): bool
    {
        $self = $this;

        $query = static::query()
            ->withoutGlobalScopes()
            ->where($this->slugColumn(), $slug);

        if ($self->exists) {
            $query->where($self->getKeyName(), '!=', $self->getKey());
        }

        foreach ($this->slugScopeAttributes() as $attribute) {
            $value = array_key_exists($attribute, $scope)
                ? $scope[$attribute]
                : $self->getAttribute($attribute);

            $value !== null
                ? $query->where($attribute, $value)
                : $query->whereNull($attribute);
        }

        $this->applySlugConstraints($query);

        return $query->exists();
    }

    /**
     * @return list<string>
     */
    protected function slugScopeAttributes(): array
    {
        return [];
    }

    protected function slugColumn(): string
    {
        return 'slug';
    }

    protected function slugFallback(): string
    {
        return 'item';
    }

    private function isSlugUniqueConstraintViolation(QueryException $exception): bool
    {
        $message = Str::lower($exception->getMessage());
        $isUniqueViolation = in_array((string) $exception->getCode(), ['23000', '23505'], true)
            || Str::contains($message, ['unique constraint', 'duplicate entry', 'duplicate key']);

        return $isUniqueViolation && Str::contains($message, $this->slugColumn());
    }

    /**
     * Hook for models to add additional WHERE constraints (e.g. soft-deleted
     * records). Default: no additional constraints.
     */
    protected function applySlugConstraints(Builder $query): void
    {
        // no-op
    }
}