php – Laravel Database Schema,Nullable Foreign

我有这两个数据库表：

>用户表
>合作伙伴表

用户表将处理此类信息

Schema::create('users', function (Blueprint $table) {
      $table->increments('id')->unique();
      $table->string('email')->unique();
      $table->string('username')->unique();
      $table->string('password', 60);
      $table->string('photo')->nullable();
      $table->integer('partner_id')->unsigned();
      $table->foreign('partner_id')->references('id')->on('partners');
      $table->rememberToken();
      $table->timestamps();
});

合作伙伴表将包含所有用户元信息,如名字和姓氏等.

Schema::create('partners', function (Blueprint $table) {

    /**
     * Identity Columns
     */
    $table->increments('id')->unique();
    $table->string('first_name');
    $table->string('middle_name')->nullable();
    $table->string('last_name')->nullable();
    $table->string('display_name')->nullable();
    $table->string('email')->unique()->nullable();
    $table->string('website')->nullable();
    $table->string('phone')->nullable();
    $table->string('mobile')->nullable();
    $table->string('fax')->nullable();
    $table->date('birthdate')->nullable();
    $table->longText('bio')->nullable();
    $table->string('lang')->nullable(); //Language

    /**
     * Address Columns
     */
    $table->text('street')->nullable();
    $table->text('street2')->nullable();
    $table->integer('country_id')->unsigned(); // foreign
    $table->foreign('country_id')->references('id')->on('countries');
    $table->integer('state_id')->unsigned();   // foreign
    $table->foreign('state_id')->references('id')->on('country_states');
    $table->string('city')->nullable();
    $table->string('district')->nullable();
    $table->string('area')->nullable();
    $table->string('zip')->nullable();
});

当用户注册到网站时,我只想要几个字段,用户名,电子邮件地址,密码,名字和姓氏.这些只是必填字段.

因此,合作伙伴表中的信息可以在用户完成注册到站点后填写.

但是由于外键的结构,由于这个错误,我无法继续进行：

sqlSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`mytable`.`tbl_partners`, CONSTRAINT `partners_country_id_foreign` FOREIGN KEY (`country_id`) REFERENCES `tbl_countries` (`id`)) (sql: insert into `tbl_partners` (`first_name`, `last_name`, `display_name`, `email`, `updated_at`, `created_at`) values (Jack, Wilson, admin, [e-mail], 2016-06-09 19:41:18, 2016-06-09 19:41:18))

我知道这是由伙伴表所需的countries表引起的.
我的问题是：是否有一个解决方案,所以我可以填写合作伙伴表上的国家或任何其他非必需数据,但保留国家,州等的外国表架构.

解决方法:

像这样设置country_id和state_id可以为空.

$table->integer('country_id')->nullable()->unsigned();

$table->integer('state_id')->nullable()->unsigned();