Question

我创建了迁移文件来管理新项目的菜单项。这是迁移文件。

Schema::create('menu_items', function (Blueprint $table) {            
            $table->increments('id');
            $table->unsignedInteger('menugroup_id',10);
            $table->string('name',100)->nullable();
            $table->enum('type', ['page_link','internal_link','external_link'])->nullable();
            $table->string('link')->nullable();
            $table->integer('page_id')->nullable();
            $table->integer('parent_id')->nullable();
            $table->enum('active',['1','0'])->nullable();
            $table->integer('lft')->nullable();
            $table->integer('rgt')->nullable();
            $table->integer('depth')->nullable();
            $table->timestamps(); 
            $table->foreign('menu_group_id')->references('id')->on('menu_groups')->onDelete('cascade');
        });

在运行迁移命令时发生以下错误。

  Illuminate\Database\QueryException  : SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto column and it must be defined as a key (SQL: create table `menu_items` (`id` int unsigned not null auto_increment primary key, `menugroup_id` int unsigned not null auto_increment primary key, `name` varchar(100) null, `type` enum('page_link', 'internal_link', 'external_link') null, `link` varchar(255) null, `page_id` int null, `parent_id` int null, `active` enum('1', '0') null, `lft` int null, `rgt` int null, `depth` int null, `created_at` timestamp null, `updated_at` timestamp null) default character set utf8mb4 collate utf8mb4_unicode_ci)

  at /var/www/html/xyz/vendor/laravel/framework/src/Illuminate/Database/Connection.php:664
    660|         // If an exception occurs when attempting to run a query, we'll format the error
    661|         // message to include the bindings with SQL, which will make this exception a
    662|         // lot more helpful to the developer instead of just the database's errors.
    663|         catch (Exception $e) {
  > 664|             throw new QueryException(
    665|                 $query, $this->prepareBindings($bindings), $e
    666|             );
    667|         }
    668|

我无法理解为什么会出现此错误，因为我没有设置除id之外的任何自动增量字段。如果帖子是重复的，我很乐意将其删除。

Answer 1

变化：

$table->unsignedInteger('menugroup_id',10);

要：

$table->unsignedInteger('menu_group_id',10);

Answer 2

变化： $table->unsignedInteger('menugroup_id',10);

要： $table->unsignedInteger('menugroup_id');

文档告诉第二个变量是打开/关闭auto_increment，因为你已经使用$table->increments('id');它会中断。

https://laravel.com/api/5.6/Illuminate/Database/Schema/Blueprint.html#method_unsignedInteger

<强>更新当您创建字段并尝试使用menugroup_id

创建外键时，您还有2个diffrend名称menu_group_id

Laravel 5.6迁移错误

2 个答案: