Fetch results based on the absence of the relationship in Laravel
You may wish to limit your results based on the absence of a relationship. For example, imagine you want to retrieve all blog posts that don't have any comments. To do so, you may pass the name of the relationship to the doesntHave and orDoesntHave methods:
$posts = App\Models\Post::doesntHave('comments')->get();
If you need even more power, you may use the whereDoesntHave and orWhereDoesntHave methods to put "where" conditions on your doesntHave queries. These methods allow you to add customized constraints to a relationship constraint, such as checking the content of a comment:
use Illuminate\Database\Eloquent\Builder;
$posts = App\Models\Post::whereDoesntHave('comments', function (Builder $query) {
$query->where('content', 'like', 'foo%');
})->get();
You may use "dot" notation to execute a query against a nested relationship. For example, the following query will retrieve all posts that do not have comments and posts that have comments from authors that are not banned:
use Illuminate\Database\Eloquent\Builder;
$posts = App\Models\Post::whereDoesntHave('comments.author', function (Builder $query) {
$query->where('banned', 0);
})->get();
