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[Intermediate Laravel] 9-Database-Seeding-and-Model-Factories

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Release: 2016-06-20 12:30:43
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简介

一般我们建立好应用时,需要插入一些简单数据,那我们该如何做,结论是运行Database-Seeding功能。

Database-Seeding 数据填充

默认 database\seeds\ 下只有单一的 DatabaseSeeder.php,我们新建 UsersTableSeeder.php 类:

class UsersTableSeeder extends Seeder{  /**   * Run the database seeds.   *   * @return void   */  public function run()  {    //不用factory,也可以使用App\User::create()或者DB::table()等    factory('App\User',50)->create();  }} 
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修改 DatabaseSeeder.php :

class DatabaseSeeder extends Seeder{  /**   * Run the database seeds.   *   * @return void   */  public function run()  {    Model::unguard();    //调用UsersTableSeeder    $this->call('UsersTableSeeder');  }} 
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执行 db:seed 命令: php artisan db:seed 随后我们可以查询数据是否插入:

  • 在 Unix 系统中,使用如下命令行: sqlite3 storage/database.sqlite select * from users;
  • 在 Windows 系统中可下载 Database4 免费版软件,打开 storage/database.sqlite 目录文件进行查看:

看到这里,你肯定会问这些人名,邮箱名是如何自动生成的,下面我们接着看。

数据规则

database\factories 目录下 ModelFactory.php 定义了 User 表中插入数据的规则定义:

$factory->define(App\User::class, function (Faker\Generator $faker) {  return [    'name'          => $faker->name,    'email'          => $faker->email,    'password'      => bcrypt(str_random(10)),    'remember_token' => str_random(10),  ];}); 
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UsersTableSeeder 中可以重写规则:

class UsersTableSeeder extends Seeder{  /**   * Run the database seeds.   *   * @return void   */  public function run()  {    //可以重写Model Factories中规则,统一插入 John Doe 的 name    factory('App\User',50)->create([      'name'  =>  'John Doe'    ]);  }} 
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结果如下图:

我们可以在插入数据之前,删除无效数据:

class DatabaseSeeder extends Seeder{   protected $toTruncate = ['users'];   /**   * Run the database seeds.   *   * @return void   */  public function run()  {    Model::unguard();    // 循环删除表    foreach($this->toTruncateas $table)    {      DB::table($table)->truncate();    }     $this->call('UsersTableSeeder');  }} 
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新建 LessonSeeder

这次我们同时建立 Model 和 Factories,运行命令行:

php artisan make:model Lesson --migration

补全 CreateLessonsTable 中属性字段:

class CreateLessonsTable extends Migration{  /**   * Run the migrations.   *   * @return void   */  public function up()  {    Schema::create('lessons', function (Blueprint $table) {      $table->increments('id');      $table->string('title');      $table->text('body');      $table->timestamp('published_at');      $table->timestamps();    });  }   /**   * Reverse the migrations.   *   * @return void   */  public function down()  {    Schema::drop('lessons');  }} 
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执行命令行: php artisan migrate ,创建 lessons 表结构。

补全 DatabaseSeeder 中调用 LessonsTableSeeder

class DatabaseSeeder extends Seeder{   protected $toTruncate = ['users'];   /**   * Run the database seeds.   *   * @return void   */  public function run()  {    Model::unguard();    // 循环删除表    foreach($this->toTruncateas $table)    {      DB::table($table)->truncate();    }     $this->call('UsersTableSeeder');    $this->call('LessonsTableSeeder');  }} 
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执行命令行 php artisan db:seed 会出现如下图异常:

原因是:composer.json 中默认只加载了 database

解决方案有两种:

1. 运行命令行: composer dump-autoload

2. 利用命令行创建Seeder: php artisan make:seeder LessonsTableSeeder

插入数据

在 ModelFactory.php 中新增 Lesson 插入数据规则:

$factory->define(App\Lesson::class, function (Faker\Generator $faker) {  return [    'title'          => $faker->sentence,    'body'            => $faker->paragraph,    'published_at'    => $faker->dateTime()  ];}); 
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再执行命令行: php artisan db:seed ,OK,数据顺利插入,如下图:

source:php.cn
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