Complete both the up() and down functions to change the datatype of the column isbn from an integer to a string /** * Run the migrations. * @return void */ public function up { Schema::table('books', function (Blueprint Stable) { $table-> ('isbn')-> (); }); } ** * Reverse the migrations. * * @return void */ public function down() { Schema::table('books', function (Blueprint stable) { Stable-> ('isbn')->change(); }); }