SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint - Laravel

Question

I\'m trying to create a table to hold photos and link it to the ad (property id). I\'m getting this error

SQLSTATE[HY000]: General error: 1215 Cannot add

Answer 1

Make it unsigned because you're using increments(). And move FK constraint part to a separate closure:

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');
    });
}