firefly-iii/app/Models/Category.php

<?php
/**
 * Category.php
 * Copyright (c) 2019 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Models;

use FireflyIII\Support\Models\ReturnsIntegerIdTrait;
use FireflyIII\Support\Models\ReturnsIntegerUserIdTrait;
use FireflyIII\User;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\MorphMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

/**
 * @mixin IdeHelperCategory
 */
class Category extends Model
{
    use ReturnsIntegerIdTrait;
    use ReturnsIntegerUserIdTrait;
    use SoftDeletes;

    protected $casts
                        = [
            'created_at' => 'datetime',
            'updated_at' => 'datetime',
            'deleted_at' => 'datetime',
            'encrypted'  => 'boolean',
        ];

    protected $fillable = ['user_id', 'user_group_id', 'name'];

    protected $hidden   = ['encrypted'];

    /**
     * Route binder. Converts the key in the URL to the specified object (or throw 404).
     *
     * @throws NotFoundHttpException
     */
    public static function routeBinder(string $value): self
    {
        if (auth()->check()) {
            $categoryId = (int)$value;

            /** @var User $user */
            $user       = auth()->user();

            /** @var null|Category $category */
            $category   = $user->categories()->find($categoryId);
            if (null !== $category) {
                return $category;
            }
        }

        throw new NotFoundHttpException();
    }

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function attachments(): MorphMany
    {
        return $this->morphMany(Attachment::class, 'attachable');
    }

    /**
     * Get all of the category's notes.
     */
    public function notes(): MorphMany
    {
        return $this->morphMany(Note::class, 'noteable');
    }

    public function transactionJournals(): BelongsToMany
    {
        return $this->belongsToMany(TransactionJournal::class, 'category_transaction_journal', 'category_id');
    }

    public function transactions(): BelongsToMany
    {
        return $this->belongsToMany(Transaction::class, 'category_transaction', 'category_id');
    }
}