In this example we will see laravel 8 eloquent whereHas() condition. you will learn about wherehas() condition in laravel 8. I will give you simple example of how to use wherehas() condition with laravel eloquent relationship. you can also use with laravel 6, laravel 7 and laravel 8 version.

    For wherehas condition in laravel 8 we need two table like users and country and in users tabel add country_id.

    So, let's start to implements laravel 8 whereHas() realationship.

    Laravel eloquent whereHas() method works basically the same as has() but it just allows you to specify additional filters for the related model to check. 

public function index()
{
    $name = 'india';
    $users = User::with('country')
                    ->whereHas('country', function ($query) use($name){
                        $query->where('name', 'like', '%'.$name.'%');
                    })
                    ->get()
                    ->toArray();
}

     Laravel eloquent has() method is used to filter the selecting model based on the selected relationship. It works similarly to where method for relations.

use App\Models\User;

$users = User::has('country')->get();

    You may also specify an operator and count value to further customize the query: 

$posts = Post::has('comments', '>=', 3)->get();

    app/Models/User.php

<?php
  
namespace App\Models;
  
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
  
class User extends Authenticatable
{
    
    protected $fillable = [
        'name',
        'email',
        'password',
    ]; 
  
    public function country()
    {
        return $this->belongsTo(Country::class);
    }
}

    app/Models/Country.php

<?php
  
namespace App\Models;
  
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
  
class Country extends Model
{
    use HasFactory;
}

    app/Http/Controllers/UserController.php

<?php
  
namespace App\Http\Controllers;
  
use Illuminate\Http\Request;
use App\Models\User;
  
class UserController extends Controller
{
    public function index()
    {
        $name = 'india';
        $users = User::with('country')
                        ->whereHas('country', function ($query) use($name){
                            $query->where('name', 'like', '%'.$name.'%');
                        })
                        ->get()
                        ->toArray();  
    }
}

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