One to Many & One to One Polymorphic Relationships - Laravel Eloquent Relationships (phần 1)

Ví dụ 1: Tạo dữ liệu cho comments, posts, users sử dụng morphMany, morphs, morphTo

Bức ảnh sau giải thích ta sử dụng morphs để xử lý nhanh 2 bảng commentable_id, commentable_type :)

C:\xampp\htdocs\hanam.com\routes\web.php

Route::get('/', function () {
  $user = \App\User::create([
    'name'     => 'Lionel',
    'email'    => '[e-mail]',
    'password' => Hash::make('password'),
  ]);
  $post = \App\Post::create([
    'user_id' => $user->id,
    'title'   => "Title example 1",
  ]);
  $post->comments()->create([
    'user_id' => $user->id,
    'body' => 'Comment For Post 1'
  ]);
  return view('welcome');
});

C:\xampp\htdocs\hanam.com\app\Video.php

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Video extends Model {
	protected $guarded = [];
  public function comments() {
    return $this->morphMany(Comment::class,'commentable');
  }
}

C:\xampp\htdocs\hanam.com\app\Comment.php

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Comment extends Model {
	protected $guarded = [];
  public function commentable() {
  	return $this->morphTo();
  }
}

C:\xampp\htdocs\hanam.com\app\Post.php

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model {
  protected $fillable = ['user_id','title'];
  public function user() {
  	return $this->belongsTo(User::class)->withDefault([
  		'name' => 'Guest User'
  	]);
  }
  public function tags() {
  	// return $this->belongsToMany(Tag::class,'post_tag','post_id','tag_id');
  	// return $this->belongsToMany(Tag::class)->withTimestamps();
    return $this->belongsToMany(Tag::class)
    ->using(PostTag::class)
    ->withTimestamps()
    ->withPivot('status');
  }
  public function comments() {
    return $this->morphMany(Comment::class,'commentable');
  }
}

C:\xampp\htdocs\hanam.com\database\migrations\2020_08_10_143945_create_comments_table.php

<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateCommentsTable extends Migration {
  /**
   * Run the migrations.
   *
   * @return void
   */
  public function up() {
    Schema::create('comments', function (Blueprint $table) {
      $table->id();
      $table->text('body');
      $table->bigInteger('user_id');
      // $table->bigInteger('commemtable_id');
      // $table->string('commemtable_type');
      $table->morphs('commentable');
      $table->timestamps();
    });
  }
  /**
   * Reverse the migrations.
   *
   * @return void
   */
  public function down() {
    Schema::dropIfExists('comments');
  }
}

C:\xampp\htdocs\hanam.com\database\migrations\2020_08_10_143922_create_videos_table.php

<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateVideosTable extends Migration {
  /**
   * Run the migrations.
   *
   * @return void
   */
  public function up() {
    Schema::create('videos', function (Blueprint $table) {
      $table->id();
      $table->string('title');
      $table->timestamps();
    });
  }
  /**
   * Reverse the migrations.
   *
   * @return void
   */
  public function down() {
    Schema::dropIfExists('videos');
  }
}

Ví dụ 2: Sử dụng morphTo

C:\xampp\htdocs\hanam.com\app\Comment.php

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Comment extends Model {
	protected $guarded = [];
  public function commentable() {
  	return $this->morphTo();
  }
}

C:\xampp\htdocs\hanam.com\routes\web.php

$comment = \App\Comment::find(3);
  dd($comment->commentable);
  return view('welcome');

Kết quả: tìm được dữ liệu của comment 3 là trong video

Ví dụ 3: Sử dụng morphOne

C:\xampp\htdocs\hanam.com\app\Post.php

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model {
  protected $fillable = ['user_id','title'];
  public function user() {
  	return $this->belongsTo(User::class)->withDefault([
  		'name' => 'Guest User'
  	]);
  }
  public function tags() {
  	// return $this->belongsToMany(Tag::class,'post_tag','post_id','tag_id');
  	// return $this->belongsToMany(Tag::class)->withTimestamps();
    return $this->belongsToMany(Tag::class)
    ->using(PostTag::class)
    ->withTimestamps()
    ->withPivot('status');
  }
  public function comments() {
    return $this->morphMany(Comment::class,'commentable');
  }
  public function comment() {
    // return $this->morphOne(Comment::class,'commentable');
    return $this->morphOne(Comment::class,'commentable')->latest();
  }
}

C:\xampp\htdocs\hanam.com\routes\web.php

$post = \App\Post::find(1);
  dd($post->comment);
  return view('welcome');