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メモ > 技術 > フレームワーク: Laravel6 > 複雑なCRUDの新規作成例（記事管理を作成）
■複雑なCRUDの新規作成例（記事管理を作成）

マイグレーションを作成

$ php artisan make:migration create_entries_table


作成されたマイグレーションを以下のように修正
bigInteger の引数は、「カラム名」「自動採番するか」「0以上の正の整数とするか」となっている
「$table->bigInteger('user_id')->unsigned();」と書けるかも。それならその方が直感的でいいかも
要検証

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('entries', function (Blueprint $table) {
            $table->engine = 'InnoDB';
            $table->bigIncrements('id');
            $table->dateTime('datetime')->comment('日時');
            $table->string('title')->comment('タイトル');
            $table->text('body')->comment('本文');
            $table->bigInteger('user_id', false, true);
            $table->timestamps();
            $table->softDeletes();
        });
        DB::statement('ALTER TABLE entries COMMENT \'記事\'');
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('entries');
    }


マイグレーションを実行

$ php artisan migrate


プログラムを作成

app/Models/Entry.php
<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Entry extends Model
{
    use SoftDeletes;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'datetime', 'title', 'body', 'user_id',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'datetime' => 'datetime',
    ];
}


app/Contracts/Repositories/EntryRepository.php
<?php

namespace App\Contracts\Repositories;

interface EntryRepository
{
    /**
     * 取得
     *
     * @param  int  $id
     * @return mixed
     */
    public function find($id);

    /**
     * 検索
     *
     * @param  array  $conditions
     * @param  array  $orders
     * @param  int|null  $limit
     * @return mixed
     */
    public function search(array $conditions, array $orders, $limit);

    /**
     * 件数
     *
     * @return int
     */
    public function count();

    /**
     * 保存
     *
     * @param  array  $data
     * @param  int|null  $id
     * @return mixed
     */
    public function save(array $data, $id);

    /**
     * 削除
     *
     * @param  int  $id
     * @return mixed
     */
    public function delete($id);
}


app/Repositories/EntryRepository.php
<?php

namespace App\Repositories;

use App\Contracts\Repositories\EntryRepository as EntryRepositoryContract;
use App\Models\Entry;

class EntryRepository implements EntryRepositoryContract
{
    /** @var Entry */
    protected $entry;

    /**
     * コンストラクタ
     *
     * @param Entry  $entry
     * @return void
     */
    public function __construct(Entry $entry)
    {
        $this->entry = $entry;
    }

    /**
     * 取得
     *
     * @param  int  $id
     * @return mixed
     */
    public function find($id)
    {
        return $this->entry->find($id);
    }

    /**
     * 検索
     *
     * @param  array  $conditions
     * @param  array  $orders
     * @param  int|null  $limit
     * @return mixed
     */
    public function search(array $conditions = array(), array $orders = array(), $limit = null)
    {
        $query = $this->entry->query();
        $query = $this->setConditions($query, $conditions);

        foreach ($orders as $order) {
            $query->orderBy($order[0], $order[1]);
        }

        if ($limit == null) {
            return $query->get();
        } else {
            return $query->paginate($limit);
        }
    }

    /**
     * 件数
     *
     * @param  array  $conditions
     * @return int
     */
    public function count(array $conditions = array())
    {
        $query = $this->entry->query();
        $query = $this->setConditions($query, $conditions);

        return $query->count();
    }

    /**
     * 保存
     *
     * @param  array  $data
     * @param  int|null  $id
     * @return Entry
     */
    public function save(array $data, $id = null)
    {
        return $this->entry->updateOrCreate(['id' => $id], $data);
    }

    /**
     * 削除
     *
     * @param  int  $id
     * @return mixed
     */
    public function delete($id)
    {
        return $this->entry->findOrFail($id)->delete();
    }

    /**
     * 検索条件を設定
     *
     * @param  int  $query
     * @param  array  $conditions
     * @return \Illuminate\Database\Query\Builder
     */
    private function setConditions($query, array $conditions = array())
    {
        if (isset($conditions['id'])) {
            $query->where('id', $conditions['id']);
        }
        if (isset($conditions['title'])) {
            $query->where('title', $conditions['title']);
        }
        if (isset($conditions['title_like'])) {
            $query->where('title', 'like', $conditions['title_like']);
        }

        return $query;
    }
}


app/Services/EntryService.php
<?php

namespace App\Services;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use App\Contracts\Repositories\EntryRepository;
use App\Http\Requests\StoreEntryRequest;
use App\Http\Requests\UpdateEntryRequest;

class EntryService
{
    /** @var EntryRepository */
    protected $entryRepository;

    /**
     * コンストラクタ
     *
     * @param  EntryRepository  $entryRepository
     * @return void
     */
    public function __construct(EntryRepository $entryRepository)
    {
        $this->entryRepository = $entryRepository;
    }

    /**
     * 1件取得
     *
     * @param  int  $id
     * @return mixed
     */
    public function getEntry($id)
    {
        return $this->entryRepository->find($id);
    }

    /**
     * 検索して取得
     *
     * @param  array  $conditions
     * @param  array  $orders
     * @param  int  $limit
     * @return mixed
     */
    public function getEntries(array $conditions = array(), array $orders = array(), $limit = null)
    {
        return $this->entryRepository->search($conditions, $orders, $limit);
    }

    /**
     * 件数を取得
     *
     * @param  array  $conditions
     * @return int
     */
    public function countEntries(array $conditions = array())
    {
        return $this->entryRepository->count($conditions);
    }

    /**
     * 登録
     *
     * @param  StoreEntryRequest  $request
     * @return \App\Models\Entry
     */
    public function storeEntry(StoreEntryRequest $request)
    {
        $input = $request->only([
            'datetime',
            'title',
            'body',
            'user_id',
        ]);

        // 保存
        try {
            return DB::transaction(function () use ($input) {
                $result = $this->entryRepository->save($input);

                return $result;
            });
        } catch (\Exception $e) {
            Log::error('EntryService:storeEntry', ['message' => $e->getMessage(), 'input' => $input]);

            return null;
        }
    }

    /**
     * 編集
     *
     * @param  UpdateEntryRequest  $request
     * @param  int  $id
     * @return \App\Models\Entry
     */
    public function updateEntry(UpdateEntryRequest $request, $id)
    {
        $input = $request->only([
            'datetime',
            'title',
            'body',
            'user_id',
        ]);

        // 保存
        try {
            return DB::transaction(function () use ($input, $id) {
                $result = $this->entryRepository->save($input, $id);

                return $result;
            });
        } catch (\Exception $e) {
            Log::error('EntryService:updateEntry', ['message' => $e->getMessage(), 'input' => $input, 'id' => $id]);

            return null;
        }
    }

    /**
     * 削除
     *
     * @param  int  $id
     * @return \App\Models\Entry
     */
    public function deleteEntry($id)
    {
        try {
            return DB::transaction(function () use ($id) {
                return $this->entryRepository->delete($id);
            });
        } catch (\Exception $e) {
            Log::error('EntryService:deleteEntry', ['message' => $e->getMessage(), 'id' => $id]);

            return null;
        }
    }
}


app/Providers/AppServiceProvider.php
        $this->app->bind(
            \App\Contracts\Repositories\EntryRepository::class,
            \App\Repositories\EntryRepository::class
        );


app/Http/Requests/StoreEntryRequest.php
<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class StoreEntryRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'datetime' => ['required'],
            'title' => ['required', 'string', 'max:255'],
            'body' => ['required'],
            'user_id' => ['required', 'integer'],
        ];
    }

    /**
     * バリデーションエラーのカスタム属性の取得
     *
     * @return array
     */
    public function attributes()
    {
        return [
            'datetime' => '日時',
            'title' => 'タイトル',
            'body' => '本文',
            'user_id' => 'ユーザ',
        ];
    }
}


main/app/Http/Requests/UpdateEntryRequest.php
<?php

namespace App\Http\Requests;

class UpdateEntryRequest extends StoreEntryRequest
{
}


app/Http/Controllers/Admin/EntryController.php
<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Http\Requests;
use App\Http\Requests\StoreEntryRequest;
use App\Http\Requests\UpdateEntryRequest;
use App\Models\Entry;
use App\Services\EntryService;
use App\Services\UserService;

class EntryController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @param  EntryService  $entryService
     * @param  UserService  $userService
     * @return void
     */
    public function __construct(
        EntryService $entryService,
        UserService $userService
    )
    {
        $this->middleware('auth');

        $this->entryService = $entryService;
        $this->userService = $userService;
    }

    /**
     * Display a list of all entries.
     *
     * @param  Request  $request
     * @return Response
     */
    public function index(Request $request)
    {
        return view('admin.entry.index', [
            'entries' => $this->entryService->getEntries([], [['id', 'desc']]),
        ]);
    }

    /**
     * Display a form of new entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function create(Request $request)
    {
        return view('admin.entry.form', [
            'users' => $this->userService->getUsers(),
        ]);
    }

    /**
     * Create a new entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function store(StoreEntryRequest $request)
    {
        if ($this->entryService->storeEntry($request)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を登録しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を登録できませんでした。');
        }
    }

    /**
     * Display a form of edit entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function edit(Request $request, $id)
    {
        return view('admin.entry.form', [
            'entry' => $this->entryService->getEntry($id),
            'users' => $this->userService->getUsers(),
        ]);
    }

    /**
     * Update a entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function update(UpdateEntryRequest $request, $id)
    {
        if ($this->entryService->updateEntry($request, $id)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を編集しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を編集できませんでした。');
        }
    }

    /**
     * Destroy the given entry.
     *
     * @param  Request  $request
     * @param  string  $id
     * @return Response
     */
    public function destroy(Request $request, $id)
    {
        if ($this->entryService->deleteEntry($id)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を削除しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を削除できませんでした。');
        }
    }
}


resources/views/admin/home.blade.php
                        <li><a href="{{ route('admin.entry.index') }}">記事管理</a></li>


resources/views/admin/entry/index.blade.php
@extends('layouts.app')

@section('content')
<div class="container">
    <div class="row justify-content-center">
        <div class="col-md-8">
            <div class="card">
                <div class="card-header">記事一覧</div>
                <div class="card-body">
                    @if (session('message'))
                    <div class="box">
                        <div class="alert alert-success">
                            {{ session('message') }}
                        </div>
                    </div>
                    @elseif (session('error'))
                    <div class="box">
                        <div class="alert alert-danger">
                            {{ session('error') }}
                        </div>
                    </div>
                    @endif
                    <p><a href="{{ route('admin.entry.create') }}" class="btn btn-primary">記事登録</a></p>
                    <table class="table table-striped">
                        <thead>
                            <th>日時</th>
                            <th>タイトル</th>
                            <th>編集</th>
                            <th>削除</th>
                        </thead>
                        <tbody>
                            @foreach ($entries as $entry)
                            <tr>
                                <td class="table-text"><div>{{ $entry->datetime->format('Y/m/d H:i:s') }}</div></td>
                                <td class="table-text"><div>{{ $entry->title }}</div></td>
                                <td class="table-text"><a href="{{ route('admin.entry.edit', ['id' => $entry->id]) }}" class="btn btn-primary">Edit</a></td>
                                <td>
                                    <form action="{{ route('admin.entry.delete', ['id' => $entry->id]) }}" method="POST">
                                        {{ csrf_field() }}
                                        {{ method_field('DELETE') }}
                                        <button type="submit" class="btn btn-danger">
                                            Delete
                                        </button>
                                    </form>
                                </td>
                            </tr>
                            @endforeach
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>
@endsection


resources/views/admin/entry/form.blade.php
@extends('layouts.app')

@section('content')
<div class="container">
    <div class="row justify-content-center">
        <div class="col-md-8">
            <div class="card">
                <div class="card-header">記事 @if (!Request::is('*/create')) {{ '編集' }} @else {{ '登録' }} @endif</div>

                <div class="card-body">
                    @if (count($errors) > 0)
                    <div class="alert alert-danger">
                        @foreach ($errors->all() as $error)
                        {{ $error }}<br>
                        @endforeach
                    </div>
                    @endif

                    <form action="{{ Request::is('*/create') ? route('admin.entry.create') : route('admin.entry.edit', ['id' => $entry->id]) }}" method="POST" class="form-horizontal">
                        @if (!Request::is('*/create'))
                            {{ method_field('put') }}
                        @endif
                        {{ csrf_field() }}

                        <div class="form-group">
                            <label for="datetime" class="col-sm-3 control-label">日時</label>

                            <div class="col-sm-6">
                                <input type="text" name="datetime" id="datetime" class="form-control" value="{{ old('datetime', isset($entry) ? $entry->datetime : '') }}">
                            </div>
                        </div>

                        <div class="form-group">
                            <label for="title" class="col-sm-3 control-label">タイトル</label>

                            <div class="col-sm-6">
                                <input type="text" name="title" id="title" class="form-control" value="{{ old('title', isset($entry) ? $entry->title : '') }}">
                            </div>
                        </div>

                        <div class="form-group">
                            <label for="body" class="col-sm-3 control-label">本文</label>

                            <div class="col-sm-12">
                                <textarea name="body" id="body" rows="10" cols="10" class="form-control">{{{ old('body', isset($entry) ? $entry->body : '') }}}</textarea>
                            </div>
                        </div>

                        <div class="form-group">
                            <label for="user_id" class="col-sm-3 control-label">ユーザ</label>

                            <div class="col-sm-6">
                                <select name="user_id" class="form-control">
                                    <option value=""></option>
                                    @foreach ($users as $user)
                                    <option value="{{ $user->id }}" @if (old('user_id', isset($entry) ? $entry->user_id : '') == $user->id) selected @endif>{{ $user->name }}</option>
                                    @endforeach
                                </select>
                            </div>
                        </div>

                        <div class="form-group">
                            <div class="col-sm-offset-3 col-sm-6">
                                <button type="submit" class="btn btn-primary">
                                    <i class="fa fa-btn fa-plus"></i>@if (!Request::is('*/create')) {{ '編集' }} @else {{ '登録' }} @endif
                                </button>
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
@endsection


routes/web.php
            // 記事管理
            Route::get('/entry', 'EntryController@index')->name('.entry.index');
            Route::get('/entry/create', 'EntryController@create')->name('.entry.create');
            Route::post('/entry/create', 'EntryController@store')->name('.entry.store');
            Route::get('/entry/edit/{id}', 'EntryController@edit')->name('.entry.edit');
            Route::put('/entry/edit/{id}', 'EntryController@update')->name('.entry.update');
            Route::delete('/entry/delete/{id}', 'EntryController@destroy')->name('.entry.delete');
■1対1でリレーション（記事に関連するユーザを取得）

app/Models/Entry.php に以下を追加
    /**
     * 記事に関連するユーザを取得
     */
    public function user()
    {
        return $this->belongsTo('App\Models\User');
    }


resources/views/admin/entry/index.blade.php のテーブルヘッダ部分とテーブルデータ部分に、それぞれ以下を追加
                            <th>ユーザ</th>

                                <td class="table-text"><div>{{ $entry->user->name }}</div></td>


このとき、一覧表示のために発行されるSQLは以下のようになる
記事数に応じてselectの数が増える、いわゆる「N+1問題」によって処理速度が遅くなる
select * from `entries` where `entries`.`deleted_at` is null order by `id` desc
select * from `users` where `users`.`id` = 14 and `users`.`deleted_at` is null limit 1
select * from `users` where `users`.`id` = 1 and `users`.`deleted_at` is null limit 1
select * from `users` where `users`.`id` = 47 and `users`.`deleted_at` is null limit 1
select * from `users` where `users`.`id` = 2 and `users`.`deleted_at` is null limit 1
select * from `users` where `users`.`id` = 1 and `users`.`deleted_at` is null limit 1


app/Repositories/EntryRepository.php の search() 内にある以下の部分を変更
        $query = $this->entry->query();
↓
        $query = $this->entry->query()->with('user');


これなら最初に必要なデータを一括して取得するので、上記の問題は解消できる
select * from `entries` where `entries`.`deleted_at` is null order by `id` desc
select * from `users` where `users`.`id` in (1, 2, 14, 47) and `users`.`deleted_at` is null


Eloquent：リレーション 6.x Laravel
https://readouble.com/laravel/6.x/ja/eloquent-relationships.html■多対多でリレーション（記事に関連するカテゴリを複数登録して取得）

マイグレーションを作成

$ php artisan make:migration create_category_entry_table


作成されたマイグレーションを以下のように修正

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('category_entry', function (Blueprint $table) {
            $table->bigInteger('category_id', false, true)->index();
            $table->bigInteger('entry_id', false, true)->index();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('category_entry');
    }


マイグレーションを実行

$ php artisan migrate


引き続きプログラムを実装する

app/Models/Entry.php に以下を追加
    /**
     * 記事に関連するカテゴリを取得
     */
    public function categories()
    {
        return $this->belongsToMany('App\Models\Category');
    }


app/Repositories/EntryRepository.php
    /**
     * 取得
     *
     * @param  int  $id
     * @return mixed
     */
    public function find($id)
    {
        return $this->entry->with(['categories' => function($query) {
            $query->orderBy('sort');
        }, 'user'])->find($id);
    }

    /**
     * 検索
     *
     * @param  array  $conditions
     * @param  array  $orders
     * @param  int|null  $limit
     * @return mixed
     */
    public function search(array $conditions = array(), array $orders = array(), $limit = null)
    {
        $query = $this->entry->query()->with(['categories' => function($query) {
            $query->orderBy('sort');
        }, 'user']);

〜中略〜

    /**
     * 保存
     *
     * @param  array  $data
     * @param  int|null  $id
     * @return Entry
     */
    public function save(array $data, $id = null)
    {
        $entry = $this->entry->updateOrCreate(['id' => $id], $data);

        $model = $this->entry->find($entry->id);
        $model->categories()->sync($data['categories']);

        return $entry;
    }


app/Services/EntryService.php
    /**
     * 登録
     *
     * @param  StoreEntryRequest  $request
     * @return \App\Models\Entry
     */
    public function storeEntry(StoreEntryRequest $request)
    {
        $input = $request->only([
            'datetime',
            'title',
            'body',
            'categories',
            'user_id',
        ]);

〜中略〜

    /**
     * 編集
     *
     * @param  UpdateEntryRequest  $request
     * @param  int  $id
     * @return \App\Models\Entry
     */
    public function updateEntry(UpdateEntryRequest $request, $id)
    {
        $input = $request->only([
            'datetime',
            'title',
            'body',
            'categories',
            'user_id',
        ]);


app/Http/Requests/StoreEntryRequest.php
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'datetime' => ['required'],
            'title' => ['required', 'string', 'max:255'],
            'body' => ['required'],
            'categories' => ['required'],
            'user_id' => ['required', 'integer'],
        ];
    }

    /**
     * バリデーションエラーのカスタム属性の取得
     *
     * @return array
     */
    public function attributes()
    {
        return [
            'datetime' => '日時',
            'title' => 'タイトル',
            'body' => '本文',
            'categories' => 'カテゴリ',
            'user_id' => 'ユーザ',
        ];
    }


app/Http/Controllers/Admin/EntryController.php
<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Http\Requests;
use App\Http\Requests\StoreEntryRequest;
use App\Http\Requests\UpdateEntryRequest;
use App\Models\Entry;
use App\Services\EntryService;
use App\Services\CategoryService;
use App\Services\UserService;

class EntryController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @param  EntryService  $entryService
     * @param  CategoryService  $categoryService
     * @param  UserService  $userService
     * @return void
     */
    public function __construct(
        EntryService $entryService,
        CategoryService $categoryService,
        UserService $userService
    )
    {
        $this->middleware('auth');

        $this->entryService = $entryService;
        $this->categoryService = $categoryService;
        $this->userService = $userService;
    }

    /**
     * Display a list of all entries.
     *
     * @param  Request  $request
     * @return Response
     */
    public function index(Request $request)
    {
        return view('admin.entry.index', [
            'entries' => $this->entryService->getEntries([], [['id', 'desc']]),
        ]);
    }

    /**
     * Display a form of new entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function create(Request $request)
    {
        return view('admin.entry.form', [
            'categories' => $this->categoryService->getCategories(),
            'users' => $this->userService->getUsers(),
        ]);
    }

    /**
     * Create a new entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function store(StoreEntryRequest $request)
    {
        if ($this->entryService->storeEntry($request)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を登録しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を登録できませんでした。');
        }
    }

    /**
     * Display a form of edit entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function edit(Request $request, $id)
    {
        $entry = $this->entryService->getEntry($id);

        return view('admin.entry.form', [
            'entry' => $entry,
            'entry_categories' => array_column($entry->categories->toArray(), 'id'),
            'categories' => $this->categoryService->getCategories(),
            'users' => $this->userService->getUsers(),
        ]);
    }

    /**
     * Update a entry.
     *
     * @param  Request  $request
     * @return Response
     */
    public function update(UpdateEntryRequest $request, $id)
    {
        if ($this->entryService->updateEntry($request, $id)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を編集しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を編集できませんでした。');
        }
    }

    /**
     * Destroy the given entry.
     *
     * @param  Request  $request
     * @param  string  $id
     * @return Response
     */
    public function destroy(Request $request, $id)
    {
        if ($this->entryService->deleteEntry($id)) {
            return redirect()->route('admin.entry.index')->with('message', '記事を削除しました。');
        } else {
            return redirect()->route('admin.entry.index')->with('error', '記事を削除できませんでした。');
        }
    }
}


resources/views/admin/entry/index.blade.php
                            <th>カテゴリ</th>

                                <td class="table-text">
                                    @foreach ($entry->categories as $category)
                                        {{ $category->name }}
                                    @endforeach
                                </td>


resources/views/admin/entry/form.blade.php
                        <div class="form-group">
                            <label class="col-sm-3 control-label">カテゴリ</label>

                            <div class="col-sm-6">
                                @foreach ($categories as $category)
                                <div>
                                    <label class="control-label conditions"><input type="checkbox" name="categories[]" value="{{ $category->id }}" @if (in_array($category->id, old('categories', isset($entry) ? $entry_categories : []))) checked @endif> {{ $category->name }}</label>
                                </div>
                                @endforeach
                            </div>
                        </div>


Eloquent：リレーション 6.x Laravel
https://readouble.com/laravel/6.x/ja/eloquent-relationships.html
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