laravel 7 eloquent on delete set null schema

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1$table->...->onDelete('set null');

1$table->...->onDelete('set null');
2
3#First make sure you set the foreign key field as nullable:
4$table->integer('foreign_id')->unsigned()->nullable();
5

1$table->foreignId('user_id')
2      ->constrained()
3      ->onDelete('cascade');

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