Laravel 字符串外键格式不正确

Question

我正在尝试在两个表之间创建一个 fk。这是我的迁移：

 public function up()
    {
        Schema::create('contracts', function (Blueprint $table) {
            $table->increments('id');
            // Some other cols removed for this post
            $table->string('user_file_path');
            $table->timestamps();
            $table->foreign('user_file_path')->references('path')->on('user_files');
        });
    }

和

public function up()
    {
        Schema::create('user_files', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('application_id')->unsigned();
            $table->string('random', 32);
            $table->string('path');
            $table->timestamps();
            $table->foreign('application_id')->references('id')->on('applications');
        });
    }

我在运行 php artisan migrate

之后收到此错误

 General error: 1005 Can't create table 'dashboard'.'#sql-1890_b6' (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table 'contracts' add constraint 'contracts_user_file_path_foreign' foreign key ('user_file_path') references 'user_files' ('path'))

我做错了什么？

Answer 1

为什么不通过 id 引用 user_files 记录，例如

public function up()
{
    Schema::create('contracts', function (Blueprint $table) {
        $table->increments('id');
        // Some other cols removed for this post
        $table->integer('user_file_id')->unsigned();
        $table->timestamps();
        $table->foreign('user_file_id')->references('id')->on('user_files');
    });
}

Laravel 字符串外键格式不正确

Laravel strings Foreign Key incorrectly formed

laravel

laravel-5

laravel-migrations