first(); $factory->define(OwnerPriceExpress::class, function (Faker $faker)use(&$unit) { if (!$unit)$unit = \App\Unit::query()->first(); return [ "name" => $faker->name, //名称 "initial_weight_unit_id" => $unit ? $unit->id : factory(\App\Unit::class), //首重单位 "additional_weight_unit_id" => $unit ? $unit->id : factory(\App\Unit::class),//续重单位 ]; });