def create_and_store_purchase_option(self, temp_book, isbn, price):
errors = []
# Check if book has correct ISBN
# Check DB for duplicate isbn entry.
# If so just make purchase option
book = Book.get(isbn=isbn)
if not book:
book = Book()
book.author = temp_book.author
if temp_book.subtitle is None:
book.title = temp_book.title
else:
book.title = temp_book.title+': ' + temp_book.subtitle
book.isbn = isbn
book.save()
# add purchaseChoice to DB
p = PurchaseChoice()
p.book_id = book.id
p.price = price
p.type = 'Hardcover'
p.isRental = False
p.link = '' # TODO change to valid link
p.local_seller_id = current_user.id
p.isLocalSeller = True
p.save()
return errors
