Related objects support

[makridenko]

class Author(BaseSBModel):
    pass

class Book(BaseSBModel):
    author: Author = fields.ForeignKey()


author = Author()
book = Book(user=user).save()
book = Book.objects.create(user=user)

# Should work like this
Book.objects.filter(author=author)
Book.objects.filter(author_id=author.id)

book = Book.objects.get(book_id=book.id)

# Get author object (lazy loadings)
book.author
# Get author id
book.author_id