laravel view not created using foreign keys

1Schema::create('larachat_chat_rooms', function (Blueprint $table) {
2        $table->increments('id');
3  		//Foreign key must be unsignedBigInteger
4        $table->unsignedBigInteger('creator_id');  
5        $table->softDeletes();
6        $table->timestamps();
7
8		//Define foreign key id here
9        $table->foreign('creator_id')->references('id')->on('users')->onDelete('cascade');
10    });