即使在模型中设置 public $increments = false 后，Laravel 8 也会自动递增列

问题描述

我正在尝试构建 Laravel 8 CRUD 应用程序。

这是我的迁移文件，2021_06_29_201031_create_books_table.PHP

<?PHP

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateBooksTable extends Migration
{
    public function up()
    {
        Schema::create('books',function (Blueprint $table) {
            $table->string('book_title',100)->primary();
            $table->integer('book_pages');
            $table->integer('book_year_published',4);
        });
    }

    public function down()
    {
        Schema::dropIfExists('books');
    }
}

和我的模型文件，Book.PHP

<?PHP

namespace App\Models;

use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Model;

class Book extends Model
{
    protected $table = 'books';
    protected $primaryKey = 'book_title';
    public $incrementing = false;
    protected $keyType = 'string';
    public $timestamps = false;

    protected $casts = [
        'book_pages' => 'int','book_year_published' => 'int'
    ];

    protected $fillable = [
        'book_pages','book_year_published'
    ];
}

当我运行迁移文件时，它给了我以下错误：

Illuminate\Database\QueryException

  sqlSTATE[42000]: Syntax error or access violation: 1068 Multiple primary key defined (sql: alter table `books` add primary key `books_book_title_primary`(`book_title`))

  at C:\xampp\htdocs\myapp\vendor\laravel\framework\src\Illuminate\Database\Connection.PHP:692
    688▕         // If an exception occurs when attempting to run a query,we'll format the error
    689▕         // message to include the bindings with sql,which will make this exception a
    690▕         // lot more helpful to the developer instead of just the database's errors.
    691▕         catch (Exception $e) {
  ➜ 692▕             throw new QueryException(
    693▕                 $query,$this->prepareBindings($bindings),$e
    694▕             );
    695▕         }
    696▕

  1   C:\xampp\htdocs\myapp\vendor\laravel\framework\src\Illuminate\Database\Connection.PHP:485
      PDOException::("sqlSTATE[42000]: Syntax error or access violation: 1068 Multiple primary key defined")

  2   C:\xampp\htdocs\myapp\vendor\laravel\framework\src\Illuminate\Database\Connection.PHP:485
      PDOStatement::execute()

我已经看过这些答案，但没有一个有效：

1. How to disable Laravel eloquent Auto Increment?
2. Syntax error or access violation: 1068 Multiple primary key defined
3. defining primary keys in migration

我想要一个名为 books 的表，它等效于以下 sql。

CREATE TABLE books(
book_title VARCHAR(100) PRIMARY KEY,book_pages INT NOT NULL,book_year_published INT(4) NOT NULL
);

解决方法

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