where we use hasone and hasmany in laravel code example

Example 1: laravel hasOne

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * Get the phone record associated with the user.
     */
    public function phone()
    {
        return $this->hasOne('App\Phone');
    }
}

Example 2: eloquent relationships

$roles = App\User::find(1)->roles()->orderBy('name')->get();