opentextsummaries/app/Models/Book.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Book extends Model
{
    protected $fillable = [
        'title',
        'slug',
        'author',
        'cover_image',
        'publication_date',
        'description',
        'category_id',
    ];

    /**
     * Use slug for route model binding and URL generation.
     */
    public function getRouteKeyName(): string
    {
        return 'slug';
    }

    /**
     * Get the category that owns the book.
     */
    public function category()
    {
        return $this->belongsTo(Category::class);
    }

    /**
     * Get the summary associated with the book.
     */
    public function summary()
    {
        return $this->hasOne(Summary::class);
    }

    /**
     * The authors that belong to the book.
     */
    public function authors()
    {
        return $this->belongsToMany(Author::class, 'author_book')->withTimestamps();
    }

    /**
     * Users who saved this book to their readlist.
     */
    public function savedByUsers()
    {
        return $this->belongsToMany(User::class, 'readlist_items')->withTimestamps();
    }

    /**
     * Reports submitted for this book's summary.
     */
    public function reports()
    {
        return $this->hasMany(SummaryReport::class);
    }

    /**
     * Reviews left by users for this book's summary.
     */
    public function reviews()
    {
        return $this->hasMany(SummaryReview::class);
    }
}