Laravel Many to Many Polymorphic Relationship Example

In this tutorial you will learn about the Laravel Many to Many Polymorphic Relationship Example and its application with practical example.

In this Laravel Many to Many Polymorphic Relationship Example tutorial, I’ll show you how to implement laravel many to many polymorphic relationship in laravel eloquent model. You will also learn how to use create, and retrieve records from database tables using Many to Many Polymorphic Relationship.

Table Of Contents−

Laravel Many to Many Polymorphic Relationship Example

In laravel, “morphToMany()” and “morphedByMany()” eloquent method allows you to create Many to Many Polymorphic Relationship in your laravel eloquent models.

In this step by step tutorial I’ll guide you through to create many to many polymorphic relationship and learn how to use this relationship:

Create Migration File

In this example we will create posts, videos, tags and taggables migration files as following:

database/migrations/posts

Schema::create('posts', function (Blueprint $table) {
 
    $table->bigIncrements('id');
 
    $table->string("name");
 
    $table->timestamps();
 
});

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

$table->bigIncrements('id');

$table->string("name");

$table->timestamps();

});

database/migrations/videos

Schema::create('videos', function (Blueprint $table) {
 
    $table->bigIncrements('id');
 
    $table->string("name");
 
    $table->timestamps();
 
});

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

$table->bigIncrements('id');

$table->string("name");

$table->timestamps();

});

database/migrations/tags

Schema::create('tags', function (Blueprint $table) {
 
    $table->bigIncrements('id');
 
    $table->string("name");
 
    $table->timestamps();
 
});

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

$table->bigIncrements('id');

$table->string("name");

$table->timestamps();

});

database/migrations/taggables

Schema::create('taggables', function (Blueprint $table) {
 
    $table->integer("tag_id");
 
    $table->integer("taggable_id");
 
    $table->string("taggable_type");
 
});

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

$table->integer("tag_id");

$table->integer("taggable_id");

$table->string("taggable_type");

});

Create many to many polymorphic relationships in model

Next, create many to many polymorphic relationships as follow:

app/Post.php

namespace App;
  
use Illuminate\Database\Eloquent\Model;
  
class Post extends Model
{
    
    public function tags()
    {
        return $this->morphToMany(Tag::class, 'taggable');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model

{

public function tags()

{

return $this->morphToMany(Tag::class, 'taggable');

}

app/Video.php

namespace App;
  
use Illuminate\Database\Eloquent\Model;
  
class Video extends Model
{
 
    public function tags()
    {
        return $this->morphToMany(Tag::class, 'taggable');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Video extends Model

{

public function tags()

{

return $this->morphToMany(Tag::class, 'taggable');

}

app/Tag.php

namespace App;
  
use Illuminate\Database\Eloquent\Model;
  
class Tag extends Model
{
    
    public function posts()
    {
        return $this->morphedByMany(Post::class, 'taggable');
    }
  
    public function videos()
    {
        return $this->morphedByMany(Video::class, 'taggable');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Tag extends Model

{

public function posts()

{

return $this->morphedByMany(Post::class, 'taggable');

}

public function videos()

{

return $this->morphedByMany(Video::class, 'taggable');

}

Insert and retrieve a record using many to many polymorphic relationship

Now I will show you how to insert and retrieve a record from posts, videos tags, and taggables table in many to many polymorphic relationship:

Retrieve Records From table

Find post tags as follow:

$post = Post::find(1);  
  
dd($post->tags);

$post = Post::find(1);

dd($post->tags);

Find video tags as follow:

$video = Video::find(1);    
  
dd($video->tags);

$video = Video::find(1);

dd($video->tags);

and you can find post and video of a specific tag like

$tag = Tag::find(1);    
  
dd($tag->posts);

$tag = Tag::find(1);

dd($tag->posts);

$tag = Tag::find(1);    
  
dd($tag->videos);

$tag = Tag::find(1);

dd($tag->videos);

Insert Records in Table

Now we can Insert tag for the post into DB table as following:

$post = Post::find(1);  
  
$tag = new Tag;
$tag->name = "Laravel";
  
$post->tags()->save($tag);

$post = Post::find(1);

$tag = new Tag;

$tag->name = "Laravel";

$post->tags()->save($tag);

Insert tag for the following video into DB table as follow:

$video = Video::find(1);    
  
$tag = new Tag;
$tag->name = "Madona";
  
$video->tags()->save($tag);

$video = Video::find(1);

$tag = new Tag;

$tag->name = "Madona";

$video->tags()->save($tag);

Insert Multiple Tags for Post:

$post = Post::find(1);  
  
$tag1 = new Tag;
$tag1->name = "Laravel";
  
$tag2 = new Tag;
$tag2->name = "jQuery";
  
$post->tags()->saveMany([$tag1, $tag2]);

$post = Post::find(1);

$tag1 = new Tag;

$tag1->name = "Laravel";

$tag2 = new Tag;

$tag2->name = "jQuery";

$post->tags()->saveMany([$tag1, $tag2]);

Using sync or attach to insert multiple tag as follow:

$post = Post::find(1);  
  
$tag1 = Tag::find(3);
$tag2 = Tag::find(4);
  
$post->tags()->attach([$tag1->id, $tag2->id]);

$post = Post::find(1);

$tag1 = Tag::find(3);

$tag2 = Tag::find(4);

$post->tags()->attach([$tag1->id, $tag2->id]);

Or use sync

$post = Post::find(1);  
  
$tag1 = Tag::find(3);
$tag2 = Tag::find(4);
  
$post->tags()->sync([$tag1->id, $tag2->id]);

$post = Post::find(1);

$tag1 = Tag::find(3);

$tag2 = Tag::find(4);

$post->tags()->sync([$tag1->id, $tag2->id]);

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Laravel Many to Many Polymorphic Relationship Example