Hello Devs,

In this tutorial, we are going to learn how to create laravel Has many Through eloquent relationship.

Follow this step by step guide given below:


Step 1: 

Create Migration

php artisan make:model User -m

php artisan make:model Post -m

php artisan make:model Country -m


Path:database\migrations\2014_10_12_000000_create_users_table.php 

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->integer('country_id');
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}

Path:database\migrations\2014_10_12_000000_create_posts_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreatePostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->id();
            $table->string("name");
            $table->integer('user_id')->unsigned();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('posts');
    }
}

Path:database\migrations\2014_10_12_000000_create_countries_table.php 

<?php


use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateCountriesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('countries', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('countries');
    }
}

Run this command:

php artisan migrate



Step 2: 

Create Model Relationship app\Country.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Country extends Model
{
    Protected $fillable =[
    	'name',
    ];

    public function posts()
    {
        return $this->hasManyThrough(
            Post::class,
            User::class,
            'country_id', // Foreign key on users table...
            'user_id', // Foreign key on posts table...
            'id', // Local key on countries table...
            'id' // Local key on users table...
        );
    }
}



Step 3 : 

Retrieve Records app\Http\Controllers\PostController.php

<?php

namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Country;

class PostController extends Controller
{
  public function index()
  {
    $country = Country::find(1);  
 
    dd($country->posts);
  }
}

I hope this example helps you.