The `is()` method of one-to-one relationships for comparing models

We can now make comparisons between related models without further database access.

1// BEFORE: the foreign key is taken from the Post model
2$post->author_id === $user->id;
3 
4// BEFORE: An additional request is made to get the User model from the Author relationship
5$post->author->is($user);
6 
7// AFTER
8$post->author()->is($user);

Tip given by @PascalBaljet