PHP编程:Laravel 5框架学习之Eloquent 关系
《Laravel 5框架学习之Eloquent 关系》要点: 一个用户可能有多个文章,一个文章是某个用户书写的,这就是关系.同样文章中可能包括多个 TAG,而一个 TAG 可能关联多个文章.PHP实战 在项目中,我们已经有了 User.php,也就是用户模型,查看一下,相当简单.我们希望直接使用 $user->articles() 的形式获取全部文章,让我们修改 user 模型:PHP实战 public function articles() { return $this->hasMany('AppArticle'); } 但是我们仅仅完成了关系中的一端,让我们来处理另一端.我们希望的形式是 $article->user(),让我们修改 article 模型.PHP实战 public function user() { return $this->belongsTo('AppUser'); } 在我们的数据库中,文章模型没有用户的外键,我们需要设置,修改 create_article_table.phpPHP实战 Schema::create('articles',function(Blueprint $table) { $table->increments('id'); //指定外键列 $table->integer('user_id')->unsigned(); $table->string('title'); $table->text('body'); $table->timestamp('published_at'); $table->timestamps(); //生成外键 $table->foreign('user_id') ->references('id') ->on('users') ->onDelete('cascade'); }); 因为我们只是在开发阶段,还没有上线运行,我们可以直接修改数据库迁移文件,回滚然后迁移即可,但是如果上线运行的话,应该新建一个迁移.PHP实战 php artisan migrate:refresh #输出信息 Rolled back: 2015_03_28_050138_create_article_table Rolled back: 2014_10_12_100000_create_password_resets_table Rolled back: 2014_10_12_000000_create_users_table Nothing to rollback. Migrated: 2014_10_12_000000_create_users_table Migrated: 2014_10_12_100000_create_password_resets_table Migrated: 2015_03_28_050138_create_article_table Migrated: 2015_03_28_051200_add_excerpt_to_articels_table 现在让我们使用 tinker 来创建一个用户.PHP实战 php artisan tinker Psy Shell v0.4.1 (PHP 5.4.16 ― cli) by Justin Hileman #下面是执行过程 >>> $user = new AppUser; => <AppUser #000000007f1ad61a000000006497cc4f> {} >>> $user->name = 'zhang jinglin'; => "zhang jinglin" >>> $user->email = 'zjl@example.com'; => "zjl@example.com" >>> $user->password = bcrypt('pass'); => "$2y$10$Nbl2b9wqd.rXqKEsd3pRSOoIyFAFIhbqf71BufwDfS3Guv21SlEx2" >>> $user->save(); => true >>> AppUser::first()->toArray(); => [ "id" => "1","name" => "zhang jinglin","email" => "zjl@example.com","created_at" => "2015-03-31 03:24:55","updated_at" => "2015-03-31 03:24:55" ] >>> 现在我们需要新发布的文章和用户关联,我们暂时先修改 form_partial.blade.php 来暗藏一个用户id,只是暂时:PHP实战
代码如下:
{{--临时处理--}} {!! Form::hidden('user_id',1) !!} 同时要修改模型的 $fillabel 属性,以便我们的 Mass Assisment.PHP实战 protected $fillable = [ 'title','body','published_at','user_id' //临时设置 ]; OK,添加一个文章.我们使用 tinker 来查看一下.PHP实战 php artisan tinker Psy Shell v0.4.1 (PHP 5.4.16 ― cli) by Justin Hileman >>> AppArticle::first()->toArray(); => [ "id" => "1","user_id" => "1","title" => "User 1 Article","body" => "User 1 Body","published_at" => "2015-03-31 08:00:00","created_at" => "2015-03-31 04:17:58","updated_at" => "2015-03-31 04:17:58","excerpt" => null ] #获取用户 >>> $user = AppUser::first(); => <AppUser #0000000051cbb9d70000000073e11a3e> { id: "1",name: "zhang jinglin",email: "zjl@example.com",created_at: "2015-03-31 03:24:55",updated_at: "2015-03-31 03:24:55" } #获取用户文章 >>> $user->articles()->toArray(); BadMethodCallException with message 'Call to undefined method IlluminateDatabaseQueryBuilder::toArray()' >>> $user->articles->toArray(); => [ [ "id" => "1","excerpt" => null ] ] #为什么使用 $user->articles 而不是 #user->articles()? #事实上,$user->articles()返回的是关系,如果你想用 articles() 你需要这样用 >>> $user->articles()->get()->toArray(); => [ [ "id" => "1","excerpt" => null ] ] #你只能使用 articles() 来进行下一步的工作,好比下面的查询 $user->articles()->where('title','User 1 Article')->get(); #我们也可以通过 article 获取 user >>> $article = AppArticle::first(); => <AppArticle #0000000051cbb9d60000000073e11a3e> { id: "1",user_id: "1",title: "User 1 Article",body: "User 1 Body",published_at: "2015-03-31 08:00:00",created_at: "2015-03-31 04:17:58",updated_at: "2015-03-31 04:17:58",excerpt: null } >>> $article->user; => <AppUser #0000000051cbb92d0000000073e11a3e> { id: "1",updated_at: "2015-03-31 03:24:55" } >>> 以上所述就是本文的全部内容了,希望大家能够喜欢.PHP实战 欢迎参与《Laravel 5框架学习之Eloquent 关系》讨论,分享您的想法,编程之家 52php.cn为您提供专业教程。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |