Django: implementing JOIN using Django ORM?

Question

I have a Q&A type of site built in Django with the following models:

class Question(models.Model):
    title = models.CharField(max_length=70)
    detail         


        

Answer 1

#Consider A Foreign Key Relationship Between Books And Publisher

class Publisher(models.Model):
 name = models.CharField(max_length=100)

eclass Book(models.Model):
 publisher = models.ForeignKey(Publisher, on_delete=models.CASCADE)

#Fetch Publisher Name For A Book

book = Book.objects.select_related('publisher').get(id=1)
book.publisher.name

#Fetch books which have specific publisher

publisher = Publisher.objects.prefetch_related('book_set').get(id=1)
books = publisher.book_set.all()

for more https://kwikl3arn.com/django/JOINS