Answers for "migration laravel primary key"

foreign key in laravel migration

$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');

laravel migration with primary key

$table->string('code', 30)->primary();

foreign key laravel migration

$table->foreign('column_name')->references('id')->on('table_name')->onDelete('cascade');