Posted By
Bajarangi soft ,
Posted On 08-09-2020
Many To Many Polymorphic Relationships In Laravel
Lets start.
How to define Many To Many Polymorphic Eloquent Relationship
1.Create laravel project and connect to database in .env file.
composer create-project laravel/laravel blog --prefer-dist
2.Create Model and Migrate it.
To implement Many To Many Polymorphic Relationships in Laravel, we need models: Posts,Video,tag and taggables.
Now we need to create Posts,Video,tag and taggables models in fresh project so for that run below commands in comand prompt.
php artisan make:model Post -m
php artisan make:model Video -m
php artisan make:model tag -m
php artisan make:model taggable -m
3.After Created Models we need to Implement code in Model and migration files as below
Migration files will be in database folder
2020_09_08_111619_create_posts_table.php
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreatePostsTable extends Migration
{
public function up()
{
Schema::create('posts', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->timestamps();
});
}
public function down()
{
Schema::dropIfExists('posts');
}
}
2020_09_08_132636_create_videos_table.php
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateVideosTable extends Migration
{
public function up()
{
Schema::create('videos', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->timestamps();
});
}
public function down()
{
Schema::dropIfExists('videos');
}
}
2020_09_08_043710_create_tags_table.php
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateTagsTable extends Migration
{
public function up()
{
Schema::create('tags', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->timestamps();
});
}
public function down()
{
Schema::dropIfExists('tags');
}
}
2020_09_08_043825_create_taggables_table.php
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateTaggablesTable extends Migration
{
public function up()
{
Schema::create('taggables', function (Blueprint $table) {
$table->integer('tag_id');
$table->integer('taggable_id');
$table->string('taggable_type');
$table->timestamps();
});
}
public function down()
{
Schema::dropIfExists('taggables');
}
}
Models files will be in app folder
Post.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
protected $fillable = [
'name'
];
public function tags()
{
return $this->morphToMany('App\Tag', 'taggable');
}
}
video.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Video extends Model
{
protected $fillable = [
'name',
];
public function tags()
{
return $this->morphToMany(Tag::class, 'taggable');
}
}
Defining The Inverse Of The Relationship
Next, on the Tag model, you should define a method for each of its related models. So, for this example, we will define a posts method and a videos method:
tag.php
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class tag extends Model
{
protected $fillable = ['name'];
public function posts()
{
return $this->morphedByMany('App\Post', 'taggable');
}
public function videos()
{
return $this->morphedByMany('App\Video', 'taggable');
}
}
Retrieving The Relationship
Once your database table and models are defined, you may access the relationships via your models. For example, to access all of the tags for a post, you can use the tags dynamic property:
$post = App\Post::find(1);
4.Create route and controller to access data.
Route in Web.php
Route::get('manytomanypoly','PolyController@manytomanypoly');
Create PolyController.php using below command in command prompt.
php artisan make:controller PolyController
Implement code in PolyController.php as below to access data
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Tag;
use App\Video;
use App\Post;
class PolyController extends Controller
{
public function manytomanypoly()
{
$tag = App\Tag::find(1);
foreach ($tag->videos as $video) {
print_r($video);
}
}
}