我尝试创建一个表来保存照片并将其链接到广告(属性ID)。 我收到此错误
SQLSTATE [HY000]:常规错误:1215无法添加外键约束
这些是我的迁移文件
2018_02_14_191609_create_property_adverts_table
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreatePropertyAdvertsTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('property_adverts', function (Blueprint $table) {
$table->increments('id');
$table->string('address');
$table->string('county');
$table->string('town');
$table->string('type');
$table->string('rent');
$table->string('date');
$table->string('bedrooms');
$table->string('bathrooms');
$table->string('furnished');
$table->longText('description');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('property_adverts');
}
}
2018_02_18_165845_create_property_advert_photos_table
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreatePropertyAdvertPhotosTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('property_advert_photos', function (Blueprint $table) {
$table->increments('id');
$table->integer('propertyadvert_id')->nullable();
$table->foreign('propertyadvert_id')->references('id')->on('property_adverts');
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('property_advert_photos');
}
}
所以
答案 0 :(得分:1)
将其设为unsigned
,因为您正在使用increments()
。并将FK约束部分移动到单独的闭包中:
public function up()
{
Schema::create('property_advert_photos', function (Blueprint $table) {
$table->increments('id');
$table->unsignedInteger('propertyadvert_id')->nullable();
$table->timestamps();
});
Schema::table('property_advert_photos', function (Blueprint $table) {
$table->foreign('propertyadvert_id')->references('id')->on('property_adverts');
});
}