How to use _set for OneToOne models?

Question

Django

You need to create a queryset that will contain all the fields of connected models.

class Route(models.Model):
    name = models.CharField(max_length = 254, db_index=True, verbose_name='Имя")
    description = models.TextField(max_length = 600, verbose_name='Описание')

class Post(models.Model):
    title = models.CharField(max_length=100, verbose_name='Название', db_index=True)
    description = models.TextField(max_length=600, verbose_name='Описание')
    route = models.OneToOneField(Route, on_delete=models.CASCADE, verbose_name="Маршрут")

I know that you need to use _set in the request if there is no related_name in the database, but how can I make a request in one instance, so that later it has all the fields of the parent model and connected models and how to display this in the template?