laravel add relation to model code example

Example 1: laravel where has

use Illuminate\Database\Eloquent\Builder;

// Retrieve posts with at least one comment containing words like foo%...
$posts = App\Post::whereHas('comments', function (Builder $query) {
    $query->where('content', 'like', 'foo%');
})->get();

// Retrieve posts with at least ten comments containing words like foo%...
$posts = App\Post::whereHas('comments', function (Builder $query) {
    $query->where('content', 'like', 'foo%');
}, '>=', 10)->get();

Example 2: laravel detach

// Detach a single role from the user...
$user->roles()->detach($roleId);

// Detach all roles from the user...
$user->roles()->detach();

Example 3: eloquent relationships

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

Example 4: Laravel DB facade relations

$antiques = DB::table('antiques')
    ->join('images', 'images.antiques_id', '=', 'antiques.id')
    ->latest()
    ->limit(20)
    ->get(['antiques.*', 'images.path']);