Querying tables linked via foreign keys

A student was trying to display data from both her parent and child tables that were linked by foreign key. I played around with it and found 2 ways I can do this. 

The models(I took out most of the fields for this post because it was unnecessary for this explanation):

class Owner(models.Model):
    owner_fname = models.CharField('First Name', max_length=50, blank=False, null=False)

    Owner=models.Manager()


class PlayTime(models.Model):
    dog_name = models.CharField(max_length=50, blank=False)
    owner = models.ForeignKey(Owner, on_delete=models.CASCADE, blank=False, null=False)

    PlayTime=models.Manager()

This first method involves multiple queries to the database. The second method involves a single query, and fewer lines of code. It is the equivalent of an inner join. I didn't include the context and the return statement, which are necessary, of course, if you plan to pass these variables on to the template.

def details(request, pk):
    #============== METHOD 1: query database multiple times ===============#
    get_posts = get_object_or_404(PlayTime, pk=pk)
    print(get_posts.owner_id)
    lookup_id = get_posts.owner_id  #get foreign key
    get_owner= get_object_or_404(Owner, pk= lookup_id) #pass foreign key to second db query
    print(get_owner.owner_fname)

    # ============== METHOD 2: inner join =================#
    details = PlayTime.PlayTime.select_related('owner').get(id=pk)
    print(details.owner.owner_fname)
    # print(details.values())

 If you wanted to join all the data in both tables, you can also do so and get a queryset. In that case, you would just type: 

details = PlayTime.PlayTime.select_related('owner')

Disclaimer: I'm not sure if this is the best way to do this, but this is what I figured out from looking at documentation online.