/**
  * Run the database seeds.
  *
  * @return void
  */
 public function run()
 {
     $faker = Faker::create();
     //a real lesson id
     //a real tag id
     $lessonIds = Lesson::get()->lists('id')->all();
     //returns an array of all lesson ids
     $tagIds = Tags::get()->lists('id')->all();
     //returns an array of all tag ids
     foreach (range(1, 30) as $index) {
         //use query builder
         DB::table('lessons_tags')->insert(['lessons_id' => $faker->randomElement($lessonIds), 'tags_id' => $faker->randomElement($tagIds)]);
     }
 }