on delete cascade laravel migration code example

Example 1: cascade in laravel migration

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

Example 2: delete a migration laravel

// delete a migration safely from laravel 
delete migration from database/migrations/ directory
and also delete entry from migrations table