外键约束的格式不正确，Laravel

Question

我尝试迁移数据库，但出现错误，我不确定原因。不确定 "incorrectly formed".

是什么

//First Table
        Schema::create('lkp_anime_lists', function (Blueprint $table) {
            $table->id();
            //more columns here
        });
//Second one
        Schema::create('lkp_cards', function (Blueprint $table) {
            $table->id();
            $table->integer('lkp_anime_list_id');
        });

        Schema::table('lkp_cards', function ($table) {
            $table->foreign('lkp_anime_list_id')
                ->references('id')
                ->on('lkp_anime_lists')
                ->onDelete('cascade');
        });

SQLSTATE[HY000]: General error: 1005 Can't create table anime_db.lkp_cards (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table lkp_cards add constraint lkp_cards_lkp_anime_list_id_foreign foreign key (lkp_anime_list_id) references lkp_anime_lists (id) on delete cascade)

Answer 1

你应该使用

$table->unsignedBigInteger('lkp_anime_list_id')

而不是因为主键和外键应该是相同的数据类型

Answer 2

这对我有用

$table->bigInteger('lkp_anime_list_id')->unsigned();

对于 Laravel 版本 6+

外键约束的格式不正确，Laravel

Foreign key constraint is incorrectly formed, Laravel

laravel

laravel-7