Schema::table('cards', function (Blueprint $table) {
            $table->integer('city_id')->nullable()->change();

            $table->foreign('city_id')->references('id')->on('cities')->onUpdate('restrict')->onDelete('restrict');
        });

        Schema::table('cities', function (Blueprint $table) {
            $table->integer('cities')->nullable()->change();

            $table->foreign('city_id')->references('id')->on('cities')->onUpdate('restrict')->onDelete('restrict');
        });