Laravel 10 One to Many Polymorphic Relationship Example

Laravel 10 one to many polymorphic relationship example; In this tutorial, you will learn about laravel one to many polymorphic relationship and how to use create, and retrieve records from database tables using this relationship.

When you work with any blog post laravel application and you have many tables like posts, videos and comments.

And you need to add comments for posts and videos. So this time you can use One to Many Polymorphic Model Relationship. Because your comments model belongs to more than one model.

Note that, using “morphMany()” and “morphTo()” method, you can create One to Many Polymorphic Relationship in your laravel eloquent models.

Laravel One to Many Polymorphic Relationship Example

Follow the following steps to create one to many polymorphic relationship and learn how to use this relationship:

Step 1: Create Migration File

First of all, create posts, videos and comments migration files with following files:

posts migration file:

Schema::create('posts', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

});

videos migration file:

Schema::create('videos', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

});

comments migration file:

Schema::create('comments', function (Blueprint $table) {

    $table->increments('id');

    $table->string("body");

    $table->integer('commentable_id');

    $table->string("commentable_type");

    $table->timestamps();

});

Step 2: Create one to many polymorphic relationships in model

Next, create one to many polymorphic relationships as follow:

Post Model:

<?php

namespace App;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    /**
     * Get all of the post's comments.
     */
    public function comments()
    {
        return $this->morphMany(Comment::class, 'commentable');
    }
}

Video Model:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Video extends Model
{
    /**
     * Get all of the post's comments.
     */
    public function comments()
    {
        return $this->morphMany(Comment::class, 'commentable');
    }
}

Comment Model:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    /**
     * Get all of the owning commentable models.
     */
    public function commentable()
    {
        return $this->morphTo();
    }
}

Step 3: Retrieve, create a record using polymorphic relationship

Now you will learn how to retrieve and create a record from posts, videos and comments table using one to many polymorphic relationship:

Retrieve Records:

// for posts comments
$post = Post::find(1);

dd($post->comments);

// for videos comments
$video = Video::find(1);

dd($video->comments);

Create Records:

// for posts comments
$post = Post::find(1);

$comment = new Comment;
$comment->body = "Hello world";

$post->comments()->save($comment);

// for videos comments
$video = Video::find(1);

$comment = new Comment;
$comment->body = "hello world";

$video->comments()->save($comment);	

Conclusion

In this tutorial, you have learned how to create and use one to many polymorphic relationship in laravel apps.

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