laravel delete where null code example

Example 1: laravel on delete set null

$table->...->onDelete('set null');

#First make sure you set the foreign key field as nullable:
$table->integer('foreign_id')->unsigned()->nullable();

Example 2: laravel 7 eloquent on delete set null schema

$table->foreignId('user_id')
      ->constrained()
      ->onDelete('cascade');