Laravel - Relationships - Querying All Morph To Related Models
Instead of passing an array of possible polymorphic models, you may provide *
as a wildcard value. This will instruct Laravel to retrieve all of the possible polymorphic types from the database. Laravel will execute an additional query in order to perform this operation:
use Illuminate\Database\Eloquent\Builder;
$comments = Comment::whereHasMorph('commentable', '*', function (Builder $query) {
$query->where('title', 'like', 'foo%');
})->get();