尝试存储数据时未保存外键 Laravel 8

Question

我正在尝试将作者和流派存储到一本书中。我试图实现这一目标的方法是拥有作者 table、类型 table 和书籍 table。我想将作者和流派的外键存储到书籍中 table。

我已经创建了一个表格来存储本书所需的信息。在表单中，有两个 select 标签，我在其中循环遍历 authors 和 genres 数组。我在我的 BookController 中使用存储函数来验证正在发送的数据。验证后，我存储了一本新书。

但是，除了主键、标题、简介和时间戳外，外键没有存储在数据库中。

图书模型

class Book extends Model
{
    use HasFactory;

    protected $fillable = [
        'author_id',
        'genre_id',
        'title',
        'blurb',
    ];

    public function authors()
    {
        return $this->BelongsTo(Author::class);
    }

    public function genres()
    {
        return $this->BelongsTo(Genre::class);
    }
}

作者模型

class Author extends Model
{
    use HasFactory;

    protected $fillable = [
      'name',
    ];

    public function book()
    {
        return $this->hasMany(Book::class);
    }
}

类型模型

class Genre extends Model
{
    use HasFactory;

    protected $fillable = [
        'title'
    ];

    public function book()
    {
        return $this->hasMany(Book::class);
    }
}

BookController 创建()

    public function create()
    {
        $authors = Author::all();
        $genres = Genre::all();

        return view('admin.book.create', ['authors' => $authors, 'genres' => $genres]);
    }

BookController store()

    public function store(Request $request)
    {
        $validatedData = $request->validate([
            'title' => 'required|max:255',
            'authors' => 'required|array',
            'genres' => 'required|array',
            'blurb' => 'required',
        ]);

        Book::create($validatedData);

        return redirect()->route('admin.book.create');
    }

书籍table迁移

    public function up()
    {
        Schema::create('books', function (Blueprint $table) {
            $table->id();
            $table->foreignId('author_id');
            $table->foreignId('genre_id');
            $table->string('title');
            $table->string('blurb');
            $table->timestamps();
        });
    }

create.blade.php（创建图书页面）

    <div class="flex justify-center">
        <div class="flex justify-center border lg:w-1/4">
            <div class="flex flex-col justify-center lg:w-2/4 gap-2">
                <form action="{{ route('admin.book.store') }}" method="post">
                    @csrf
                    <div class="mb-2">
                        <h1 class="text-xl">Add Book</h1>
                    </div>
                    <div>
                        <label class="" for="title">Title</label>
                        <input name="title" class="w-10 border border-gray-400 w-full py-1 px-2" type="text">
                    </div>
                    <div>
                        <label class="" for="author">Author</label>
                        <select name="authors[]">
                            @foreach($authors as $author)
                                <option value="{{ $author->id }}">{{ $author->name }}</option>
                            @endforeach
                        </select>
                    </div>
                    <div>
                        <label class="" for="genre">Genre</label>
                        <select name="genres[]">
                            @foreach($genres as $genre)
                                <option value="{{ $genre->id }}">{{ $genre->title }}</option>
                            @endforeach
                        </select>
                    </div>
                    <div>
                        <label class="" for="blurb">Blurb</label>
                        <textarea name="blurb" id="" cols="18" rows="10"></textarea>
                    </div>
                    <div>
                        <button class="py-2 px-4 border" type="submit">Save</button>
                    </div>
                </form>
            </div>

        </div>
    </div>

编辑：当我倾倒而死时：

array:5 [▼
  "_token" => "WHlc2nvslN6l6iY4D8feeIzLEYzetMo3Ek0tLVPn"
  "title" => "Harry Potter"
  "authors" => array:1 [▼
    0 => "1"
  ]
  "genres" => array:1 [▼
    0 => "4"
  ]
  "blurb" => "Harry Potter is een zevendelige fantasyserie geschreven door de Britse schrijfster J.K. Rowling. De boeken volgen chronologisch de puberteit en de adolescentie  ▶"
]

Answer 1

你必须这样做：

首先，In You Blade 将 authors[] 中的 select 名称转换为 author_id，将 genres[] 转换为 genre_id。
将验证中的作者和流派更新为上面的新名称。

尝试存储数据时未保存外键 Laravel 8

Foreign keys not saved when trying to store data Laravel 8

php

laravel

laravel-8