Call other Seeders
• Running Seeders
  • ## Introduction
  Laravel includes a filler class that can fill your database with test data. All filling classes are placed in the
database/seeds
• directory. You can name the filler class whatever you want, but it is recommended that you follow a naming convention like UsersTableSeeder. Usually, Laravel defines a
DatabaseSeeder

class by default. Through this class, you can use the

call method to run other seed classes to control the order of data filling.

Writing Seeders

Run make:seeder this Artisan command to generate Seeder. The seeders generated by the framework will be placed in the database/seeds directory.

php artisan make:seeder UsersTableSeeder

A seeder class only contains one default method: run. This method will be called when executing the db:seed Artisan command. In the run method you can insert data into the database as needed. You can also use the query builder or Eloquent model factory to insert data manually.

{tip} Batch assignment protection is automatically disabled when data is populated.

As shown below, add a data insertion statement in the run method in the default DatabaseSeeder class:

  <?php
      use Illuminate\Support\Str;
      use Illuminate\Database\Seeder;
      use Illuminate\Support\Facades\DB;
      class DatabaseSeeder extends Seeder{    
      /**
     * Run the database seeds.
     *
     * @return void
     */    
    public function run()   
     {       
         DB::table('users')->insert([        
             'name' => Str::random(10),            
             'email' => Str::random(10).'@gmail.com',            
             'password' => bcrypt('secret'),       
           ]);  
        }
    }

{tip} You can use types to constrain the dependencies you need in the method signature of run. They are automatically resolved by the Laravel service container.

Using Model Factory

Of course, manually populating specified properties for each model is cumbersome. As an alternative, you can use a model factory to easily generate large amounts of database data. First, read the model factory documentation to learn how to define a factory file. Once you have defined your factory file, you can then use the factory helper function to insert data into the database.

For example, create 50 users and create an association for each user:

/**
 * 运行数据库填充。
 *
 * @return void
 */
 public function run(){
     factory(App\User::class, 50)->create()->each(function ($u) {
             $u->posts()->save(factory(App\Post::class)->make());   
           });
     }

Call other Seeders

In the DatabaseSeeder class, you can use the call method to run other seed classes. Use the call method to split the data population into multiple files so that a single seeder does not become extremely large. Simply pass the name of the seeder class you want to run:

/**
 * 运行数据库 seeds。
 *
 * @return void
 */
 public function run(){
     $this->call([     
        UsersTableSeeder::class,        
        PostsTableSeeder::class,        
        CommentsTableSeeder::class,    
       ]);
  }

Running Seeders

Complete the seeder class After writing, you may need to regenerate Composer's autoloader using the dump-autoload command:

composer dump-autoload

Now you can use the Artisan command db:seed to populate the database . By default, the db:seed command will run the DatabaseSeeder class, which can be used to call other Seed classes. However, you can also use the --class option to specify a specific seeder class:

php artisan db:seed

php artisan db:seed --class=UsersTableSeeder

You can also use the migrate:refresh command to populate the database, This command rolls back and reruns all migrations. This command can be used to rebuild the database:

php artisan migrate:refresh --seed